The switch from mitosis to meiosis in spermatogenesis is regulated by Follicle-stimulating hormone (FSH) levels of Luteinizing hormone (LH) and this is induced by Glial cell line-derived neurotrophic factor (GDNF).
How does FSH, LH and GDNF help in spermatogenesis?The development and maintenance of spermatogenesis is dependent on the pituitary gonadotropins; FSH and LH.FSH works on Sertoli cells and LH on Leydig cells through their receptors FSHR and LHR respectively.Self-renewal and differentiation of the spermatogonial stem cells (SSCs) is regulated by soluble factors produced by the somatic Sertoli cells. One of these is glial cell line–derived neurotrophic factor (GDNF).Learn more about mitosis and meiosis here:
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Gymnosperms and angiosperms evolved ______ allowing them to live and reproduce in drier habitats than bryophytes and seedless vascular plants.
Gymnosperms and angiosperms evolved seeds and pollen grains allowing them to live and reproduce in drier habitats than bryophytes and seedless vascular plants.
Gymnosperms are plants which bear seeds without fruits or without any outer coverings. These plants also do not produce flowers. Most plants under this group have needle-shaped leaves. This is an adaptation as these plants grow in colder conditions. Gymnosperms. These plants produce pollen without bearing flowers. Angiosperms are found in almost all climatic conditions. These plants bear flowers and produce seeds that are enclosed inside a fruit or inside an ovary. The seeds of angiosperms have a single cotyledon.
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Wavelength is 6.25x10^7 m whats the frequency
Answer:
[tex]\huge\boxed{\sf f=4.8 \ Hz}[/tex]
Explanation:
Given Data:Wavelength = λ = 6.25 × 10⁷ m
Speed of light = c = 2.998 × 10⁸ m/s
Required:Frequency = f = ?
Formula:[tex]\displaystyle f=\frac{c}{\lambda}[/tex]
Solution:Put the givens in the formula.
[tex]\displaystyle f=\frac{2.998 \times 10^8}{6.25 \times 10^7} \\\\f=0.48 \times 10^1\\\\f=4.8 \ Hz\\\\\rule[225]{225}{2}[/tex]
The graph shows the changing levels of hormones during menstruation and ovulation. What happens to hormone levels during ovulation, and why is this important?
A graph shows the changing levels of hormones during menstruation and ovulation. As an individual approaches ovulation, hormone levels increase.
The hormone levels increase to prepare a woman’s body to receive a fertilized egg.
The hormone levels decrease to prepare a woman’s body to receive a fertilized egg.
The hormone levels increase, and the next menstrual cycle begins with shedding of the uterine lining.
The hormone levels decrease, and the next menstrual cycle begins with shedding of the uterine lining
Answer:
The hormone levels decrease, and the next menstrual cycle begins with shedding of the uterine lining
Explanation:
I know for sure; I researched this because I have severe period side effects!
The presence of ________ dramatically increases the speed at which an action potential moves along an axon.
Answer:
Myelin
Explanation:
When water is heated in a metal pan or on a burner , both the water and the pen became hot. which of the two heated mainly by the mode of convection ? a. only the metal pan b. only the water in the pan c. both the metal pan and the water d. neither the metal pan nor the water
Option (a) Only the water in the pan is heated mainly by the mode of convection.
Convection is the method of heat transfer by the bulk movement of particles inside fluids like liquids and gases when heat is applied to them. the initial heat is motley provided by the conduction method but the heating of a fluid substance takes place via convection. Convection takes place due to the difference in the density of fluids.
Conduction is the process of heat transfer by direct contact due to the difference in temperature. Example utensils heat up when placed on a heater.
In the given context, the pan is heated by the virtue of conduction, and the water in the pan gets heated by the virtue of convection.
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Advantages of vegetative reproduction
Answer:
Vegetative reproduction is any form of asexual reproduction occurring in plants in which a new plant grows from a fragment or cutting of the parent plant or specialized reproductive structures, which are sometimes called vegetative propagation.
see the attached file for advantages
Match the artery with the compartment of the limbs that it supplies A. Plantar surface of the foot B. Dorsal surface of the foot C. Posterior forearm D. Posterior thigh E. Medial Compartment of the thigh F. Anterior thigh select 1. Posterior tibial artery 2. Femoral artery 3. Radial artery 4. Obturator artery 5. Deep femoral artery 6. Anterior tibial artery
Explanation:
The main artery of the lower limb is the femoral artery. It is a continuation of the external iliac artery (terminal branch of the abdominal aorta). The external iliac becomes the femoral artery when it crosses under the inguinal ligament and enters the femoral triangle.
In the femoral triangle, the profunda femoris artery arises from the posterolateral aspect of the femoral artery. It travels posteriorly and distally, giving off three main branches:
Perforating branches – Consists of three or four arteries that perforate the adductor magnus, contributing to the supply of the muscles in the medial and posterior thigh.
Lateral femoral circumflex artery – Wraps round the anterior, lateral side of the femur, supplying some of the muscles on the lateral aspect of the thigh.
Medial femoral circumflex artery – Wraps round the posterior side of the femur, supplying its neck and head. In a fracture of the femoral neck this artery can easily be damaged, and avascular necrosis of the femur head can occur.
After exiting the femoral triangle, the femoral artery continues down the anterior aspect of the thigh, through a tunnel known as the adductor canal. During its descent, the artery supplies the anterior thigh muscles.
The adductor canal ends at an opening in the adductor magnus, called the adductor hiatus. The femoral artery moves through this opening, and enters the posterior compartment of the thigh, proximal to the knee. The femoral artery is now known as the popliteal artery.
How does geology and/or hydrogeology impact the water needed by life and society?
Groundwater circulation is influenced by the geology, rock formations, and buildings.
If a region or rock formation is made up of porous and permeable rocks, groundwater will flow through it quite quickly and you may see it by looking at the plants.
Along with the creation of the rocks, geological features like faults, fractures, etc. also aid in the ease with which groundwater may travel.
The flow of groundwater will be especially challenging in a region where the primary soil type is clay or one with low porosity and permeability.
Liam is dehydrated because he has not drank enough water and has been exercising.
how will his body's endocrine system respond? why?
Antidiuretic hormone (ADH) is released by the hypothalamus through the posterior pituitary gland. The kidneys receive a signal from ADH to extract water from urine, which effectively dilutes the blood plasma.
What is dehydration?A condition that develops when the body loses too much of the fluids it needs to function normally, including water.
How does the endocrine system respond to dehydration?A person who is dehydrated, characterized by a net loss of water, which leaves insufficient water in the tissues and blood. Eventually, blood plasma is used to remove the water that leaves the body as exhaled air, perspiration, or urine. The thirst response, a chain of physiological events, is initiated as the blood gets more concentrated. In the thirst center of the hypothalamus, osmoreceptors are sensory receptors that keep track of the blood's osmolality, or solute content. The hypothalamus sends signals that cause a person to become aware of their thirst if blood osmolality rises above a healthy level. Water consumption is the appropriate response, and it usually is.
A dehydrated person's hypothalamus also releases antidiuretic hormone (ADH) via the posterior pituitary gland. The blood plasma is diluted as a result of ADH telling the kidneys to extract water from urine. A dehydrated person's hypothalamus also tells the salivary glands in the mouth to preserve water through the sympathetic nervous system. The signals cause a decrease in the release of watery, sour substances. This alteration in secretions causes "dry mouth" and a thirst-inducing sensation.
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An insecticide may be applied on a cropland to combat a particular species of beetle. After the insecticide is applied, 75% of the beetles die. The beetles that died were unable to avoid or detoxify the chemical and were thus killed by
The beetles that died were unable to avoid or detoxify the chemical and were thus killed by nerve poison insecticides.
Chemicals called insecticides are used to kill insects or stop them from acting in an unwanted or destructive way. Their structure and mechanism of operation are used to categorize them.Most insecticides function by interfering with the insect's nervous system. The herbicide prevents neurotransmitters in synapses from transmitting information. Acetylcholine is the name of the substance that the body produces and uses to transmit information through synapses. Muscles can relax because of an enzyme called cholinesterase that binds to acetylcholine.Through the synapses, acetylcholine communicates with the muscles. The cholinesterase is impacted when a pesticide is administered at a deadly dose for a specific body, preventing it from binding with the acetylcholine. The muscles become overstimulated as a result, which will cause paralysis and death.
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Why lactic acid fermentation is considered a type of Anaerobic respiration, when both of them are different things.
Answer:
Lactic acid fermentation is a type of anaerobic respiration
(or fermentation) that breaks down sugars to produce
energy in the form of ATP. It is called anaerobic because it
occurs in the absence of oxygen . Lactic acid is generated
as a byproduct of this reaction, which is what gives this
type of fermentation its name.
and also Lactic acid fermentation is the type of anaerobic
respiration carried out by yogurt bacteria (Lactobacillus
and others)
Naphthol AS-D chloroacetate esterase (specific) is usually positive in _____ cells, and alpha naphthyl acetate esterase (nonspecific)is useful for identifying blast cells of ______lineage.
Naphthol AS-D chloroacetate esterase (specific) is usually positive in Granulocytic cells, and alpha naphthyl acetate esterase (nonspecific)is useful for identifying blast cells of monocytic lineage.
White blood cells known as granulocytes have tiny granules. Proteins are present in these granules. Granulocytes can be classified as neutrophils, eosinophils, or basophils. The body uses granulocytes, particularly neutrophils, to fight bacterial infections.A monocyte is a subtype of phagocyte and a type of white blood cell.The role of the monocyte-macrophage cell lineage in acute and chronic allograft immunopathology is becoming more widely acknowledged. It is linked to lower graft performance and survival when this lineage of cells predominates in tissue that is rejecting an allograft.learn more about Granulocytic cell here: https://brainly.com/question/13051753
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what are two likey results of mitosis in an earthworm
Starch and cellulose are both polymers of glucose. If humans possess enzymes that can break down starch, why can they not use cellulose as a source of glucose as well
Humans cannot use cellulose as a source of glucose because Our digestive systems lack the enzymes necessary to hydrolyze the cellulose's -glycosidic bonds.
Cellulose is a key component of plants' stiff cell walls. A linear polysaccharide polymer with lots of glucose monosaccharide units is cellulose. Because of the beta acetal bond, it differs from starch. A significant disparity in digestibility in humans is caused by this particular variation in acetal linkages. Because they lack the necessary enzymes to dissolve the beta acetal bonds, humans are unable to digest cellulose. The intestinal tracts of creatures including cows, horses, sheep, goats, and termites contain symbiotic bacteria. The enzymes required to breakdown cellulose in the GI tract are present in these symbiotic bacteria. They possess the necessary enzymes for the breakdown or hydrolysis of the cellulose, whereas animals—not even termites—do not. No vertebrate can directly digest cellulose.however humans do not posses any such enzymes to break down cellulosic walls hence humans cannot use cellulose as a source of glucose.learn more about cellulose here: https://brainly.com/question/13551561
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Which of these is least likely to cause speciation? choose the correct answer.
a) sea levels fall, exposing a land bridge.
b) a new highway is built, separating members of a species.
c) some members of the species begin to favor new mating habits.
d) certain members of a species begin to specialize in a different food source.
b) a new highway is built, separating members of a species.
What is speciation?Speciation is the process by which new plant or animal species are developed. When a group within a species separates from other members of its species and evolves its own special traits, this is known as speciation.
What are the causes of speciation?In eukaryotic species, the processes of genetic separation (the division of one gene pool into two or more distinct gene pools) and phenotypic differentiation (the diversification of a population's range of observable physical traits) are both crucial to speciation. There are various theories on how speciation begins, and they diverge mostly in how geographic isolation and the origin of reproductive isolation are accounted for.
What are the types of speciation?Allopatric speciation
Populations that are totally divided (allopatry) by a natural barrier, such as a mountain range, river, or desert, most frequently experience geographic isolation. The two distinct populations have evolved to fit their distinct surroundings, and as a result, they have genetically diverged to the point where they cannot interbreed.
Sympatric speciation
In sympatric speciation, geographic isolation is not present; reproductive isolation takes place within a single population. Reproductive isolation typically occurs when populations are physically separated.
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Suppose that you were a researcher trying to understand how rising levels of atmospheric CO2 might affect ragweed plants, and thus seasonal ragweed allergies. What questions, hypotheses, and predictions might you want to study
Prediction a - Plants grown at higher CO2 levels will produce more pollen.
Hypothesis 2 b - CO2 levels affect the concentration of protein allergens in ragweed pollen.
Prediction c - Plants grown at higher CO2 levels will produce higher concentrations of allergens.
Researchers developed two hypotheses to explain why ragweed allergies appear to be getting worse as the global climate changes.• CO2 levels affect ragweed pollen production, with plants that grow at higher CO2 levels producing more pollen.
CO2 levels affect the concentration of allergens (the proteins that actually trigger allergic reactions) found in ragweed pollen, with plants that grow at higher CO2 levels characterized by pollen with higher concentrations of allergens.
The image is attached below showing the flow chart with answers.
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What are biodiversity hot spots?
OA. The warmest and driest ecosystems on Earth
B. Areas where large numbers of earthquakes and volcanic eruptions
occur
OC. Areas where the average annual temperature exceeds 40°C
OD. The richest and most threatened reservoirs of life on Earth
Biodiversity hotspots are the richest and most threatened reservoirs of life on Earth. Thus, the correct option is D.
What are Biodiversity hotspots?Biodiversity hotspots may be defined as the regions of the earth which are rich in biodiversity and possesses the following criteria:
The area should support greater than 1500 endemic species of flowering plants or 0.5% of total plants. It possesses a high degree of threat, exploitation, and biodiversity. It must have lost about 70% of the original habitat.A high degree of endemism (restricted habitat).Therefore, Biodiversity hotspots are the richest and most threatened reservoirs of life on Earth. Thus, the correct option is D.
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The adaptive radiation of the mammals occurred mostly during the Group of answer choices Pleistocene. Quaternary. Mesozoic. Cenozoic.
The adaptive radiation of the mammals occurred mostly during the Cenozoic period.
What is adaptive radiation?In recent years, a number of amazing findings have revolutionized our knowledge of Mesozoic mammals. These discoveries demonstrate hitherto unknown ecomorphological diversity, indicating that animals underwent a significant adaptive radiation during the Middle to Late Jurassic.Typically, adaptive radiation happens when an organism enters a new environment and varied features have an impact on its survival. This divergence occurs over a comparatively brief period of geological time. The evolution of mammals following the extinction of the dinosaurs is an illustration of adaptive radiation.Mammals evolved as a result of the extinction of the dinosaurs. when separate creatures start to resemble one another.To know more about adaptive radiation here:
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What is the outer lining of the connective tissue that surrounds the diaphysis of a long bone and contains the blood vessels that supply the bone
The outer lining of the connective tissue that surrounds the diaphysis of a long bone and contains the blood vessels that supply the bone periosteum
Bone StructureThe periosteum (peri = "around" or "surrounding") is a fibrous membrane that covers the exterior of bones. Compact bone is nourished by the blood, nerve, and lymphatic veins found in the periosteum. At the periosteum, ligaments and tendons also connect to bones.
What is the diaphysis' structure?The diaphysis's walls are made of firm, the compact bone that is dense and compact. A typical long bone demonstrates the basic anatomical features of bone. The epiphysis (plural: epiphyses), which is filled with spongy bone, is the broader portion at each end of the bone. The gaps in the spongy bone are filled with red marrow.
What is the purpose of the bone's outer layer?The outer layer contains nerve fibers that produce pain when the tissue is injured and is primarily made of collagen. Additionally, it has a large number of blood arteries, some of which have branches that enter the bone and nourish the osteocytes or bone cells.
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Use the knowledge you gained in this lab to begin a discussion about how cooking foods or refrigerating them affects browning of vegetables, growth of bacteria/fungus, and spoiling or decomposing of food. Alternately, speculate on how the apples in a HappyMeal don't turn brown for days on end. What might they have done to them
Food preservation includes refrigerating, browning of vegetables, and preventing the growth of bacteria, fungi, or other microorganisms.
What is Food Preservation?Although some methods work by adding beneficial bacteria or fungi to the food, food preservation entails stopping the growth of bacteria, fungi, or other microorganisms as well as reducing the oxidation of lipids that lead to rancidity. Processes that prevent the aesthetic deterioration of food, such as the enzymatic browning reaction that occurs when apples are chopped during food preparation, may also be included in food preservation.Numerous techniques for food preservation will be used in many different food preservation processes. For example, to preserve fruit by making jam, it must be boiled (to lower the fruit's moisture content and kill bacteria, etc.), sugared (to stop their regrowth), and then sealed in an airtight jar (to prevent recontamination).Why the apples in a HappyMeal don't turn brown for days on end?Apples in a happy meal don't turn brown for days because lemon juice or any acidic source is added to them.The acidic source prevents the oxidation of apples and hence, prevents browning.To learn more about Food Preservation refer to:
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Is a fly with no wings called a walk?
Answer:
Yes
Explanation:
A fly without wings is often referred to as a "walk" or "crawl". also i love peanut butter
Answer:
I thinks it's called a disappointment.
Explanation:
It just is.
Which of the following statements relate to natural selection? Select all that apply.
Check All That Apply
A. differential reproductive success
B. competition for resources
C. heritable variation
D. breeding to increase the frequency of desired traits
E. fitness
The following statements relate to natural selection: Differential reproductive success, Competition for resources, Heritable variation, and Fitness. Therefore options A, B, C, and E are correct.
A. Differential reproductive success: Natural selection favors individuals with advantageous traits that increase their chances of surviving and reproducing, leading to the passing on of those traits to the next generation.
B. Competition for resources: Natural selection occurs in populations facing limited resources, where individuals compete for survival and reproductive opportunities.
C. Heritable variation: Natural selection acts on heritable traits, meaning that traits that are passed down from parents to offspring can be subject to selection.
E. Fitness: Fitness refers to an individual's ability to survive, reproduce, and pass on its genes to the next generation, which is central to the process of natural selection.
Therefore options A, B, C, and E are correct.
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Which element is a metal?
O A. Ne
O B. Xe
C. F
D. Mo
Answer:
D. Molybdenum
So a metal is: a class of elements characterized by physical properties that include shininess, malleability, ductility, and conductivity.
So what is molybdenum?
It has the atomic number 42 and is a silvery-gray transition metal. Although the free element is not found in nature, it has an extremely high melting point—the sixth highest of all known elements. It is mostly mined and manufactured for alloying, notably with steel.
Uses for molybdenum metal include:
An alloying agent gives quenched and tempered steels their hardenability and toughness. Additionally, it increases steels' strength at high temperatures (red-hardness). In nickel-based alloys (such Hastelloys) and stainless steels, it gives chemical solutions heat resistance and corrosion resistance. Electrodes for forehearths and glass furnaces that use electricity for heating. Uses for nuclear energy, such as in missile and aircraft parts (where high temperature resistance is vital).As a catalyst in the petroleum refining process. In electronic and electrical applications as a filament material.As a pillar of support for lightbulbs and radios.Electric connections that are arc resistant.Sheaths for thermocouplesCoatings for other metals that prevent corrosion and flames (generally arc deposited for metallising).What is the process that all grade a milk must go through to destroy pathogenic bacteria?.
Answer:
pasteurization
Explanation:
Compare and contrast genetic engineering to the process of natural selection
Answer:
1) By selecting the genetic information that is passed on to future generations, genetic engineering is similar to natural selection.
3) By selecting the genetic information that is passed on to future generations, genetic engineering can happen at a different rate than natural selection.
4) Like natural selection, genetic engineering may be used on all organisms, including humans.
Explanation: In natural selection there is overtime selection for one particular trait and is mostly based on phenotype, whilst genetic engineering uses genotype of an organism and it is the deliberate modification of an organism by manipulating the genetic material
examples of diploblastic organisms
Answer:
Jellyfish, corals, sea anemones and comb jellies.
Explanation:
Animals in which the cells are arranged in two embryonic layers—external ectoderm and internal endoderm—are called diploblastic animals.
Vertical clinging and leaping is a locomotor pattern frequently practiced by some Group of answer choices apes. lemurs. terrestrial monkeys
Grasping and jumping vertically is a locomotor pattern often practiced by some terrestrial monkeys, because lemurs move by jumping in trees, being excellent jumpers, but lacking prehensile tails.
How does the monkey move?The locomotion of the monkeys takes place using the four limbs: legs and arms. Their hands and feet are developed so that they are useful for monkeys to cling to tree branches.
With this information, we can conclude that Primate locomotion can be classified on behavioral grounds into four major types: vertical clinging and leaping, quadrupedalism, brachiation, and bipedalism.
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The specific pattern of genes inherited at conception defines an individual's Group of answer choices phenotype. genotype. genomic imprint. somatotype.
The specific pattern of genes inherited at conception defines an individual's is genotype.
What is a genotype?The genotype of an organism is the particular arrangement of alleles for a particular gene.
The term "genotype" refers to a person's entire gene pool. All visible traits for which genes contain the coding are collectively referred to as phenotypes.
There are three types of genotypes:
homozygous dominanthomozygous recessiveheterozygous.So, The correct option is B.
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Would you rather work as a veterinarian with birds or reptiles? Why?
And which reptile or bird is your favorite? **Just curious:)
birds
hummingbird because of its wing speed
DNA technology is being used today to try to extract the DNA of a frozen wooly mammoth and blend it with the DNA of the modern elephant to create a fetus through in vitro fertilization in order to bring back a wooly mammoth hybrid to our planet.
Name a type of DNA technology that would be very helpful in this process.
The DNA technology that is helping in this process is the CRISPR-Cas system.
What is the CRISPR-Cas system?The CRISPR-Cas system is a genome editing tool that has revolutionized genetic and molecular biology.
This genome editing tool can be used to insert specific sequences of DNA into a chromosome and thus generate a new cell expressing of these genes.
In conclusion, The DNA technology referred here is CRISPR-Cas system.
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