The name used to refer to the clogged xylem tissue is heartwood in contrast to sapwood, a term for the dead, clogged xylem cells near the center of a tree. Heartwood has been the tree as the main column of support.
What is xylem?Xylem has been defined as the vascular bundle which has been used to transport water and other minerals from the root part to other parts of the plant. The main function of the xylem and phloem is to transport water and minerals from root to other parts of the plant.
The last common ancestor of the gymnosperms and angiosperms possessed the same characters such as the pollen, seeds, and the vascular tissue.The gymnosperms are a group of plant that are known as seed- producing plants such as Ginkgo, gnetophytes, cycads etc.
Angiosperms has been the plant that produces flowers and having seeds enclosed within their fruit. Gymnosperms have no production of flowers and fruits and they contain bare seeds on the surface of their leaves.
Therefore, The name used to refer to the clogged xylem tissue is heartwood in contrast to sapwood, a term for the dead, clogged xylem cells near the center of a tree. Heartwood has been the tree as the main column of support.
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the ans consists of how many neurons in a pathway?
Answer:
The efferent pathways of the ANS consist of 2 neurons that transmit impulses from the CNS to the effector tissue. The preganglionic neuron originates in the CNS with its cell body in the lateral horn of the gray matter of the spinal cord or in the brainstem.
Explanation:
add me as brain
If an experiment was being conducted using an enzyme that was very sensitive to changes in pH (which could result in denaturation), what should be added to the experiment to prevent the enzyme from denaturing?
A. a buffering solution
B. extra substrate
C. an acid
D. a base
Answer:
maybe the answer is C..sorry if i wrong
If an experiment was being conducted using an enzyme that was very sensitive to changes in pH, a buffering solution must be added in order to prevent the enzyme from denaturing. Thus, the correct option for this question is A.
What is the denaturation of an enzyme?The denaturation of an enzyme may be defined as a process through which a molecular structure of an enzyme gets deviate from its original state due to exposure to high temperature, pH sensitivity, etc.
The function of a buffering solution is to stabilize the pH of the given solution. It helps the other component of the solution to resist in response to pH change. A Buffer solution is capable to neutralize the effect of the small amount of acid or base.
Therefore, a buffering solution must be added in order to prevent the enzyme from denaturation. Thus, the correct option for this question is A.
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the cell cycle represents the coordinated sequence of events in the life
Explanation:
The cell cycle represents the coordinated sequence of events in the life of a cell from its formation to its division into two daughter cells. Most of the key events of the cell cycle are restricted to a specific time within the cycle. In this exercise, you will identify when various events occur during the cell cycle.
QUESTION: List three ways that scientists’ understanding of cells has improved our lives.
ANSWER:
Answer:
By understanding how cells function in healthy and diseased states, cell biologists from the medical, animal and plant sciences will be able to develop new vaccines, medicines and more effective plants with improved properties and, through increased knowledge, a better understanding of the way of life of all living things.
Explanation:
how is the information contained in a signaling molecule received by a cell?
Answer: Depending on the nature of the signaling molecule, it may either bind to and activate a receptor protein embedded in the plasma membrane, or it may move across the plasma membrane and bind to a receptor protein in the cytoplasm.
Explanation: I found this answer on quizlet
Answer:
How is the information contained in a signaling molecule received by a cell? Depending on the nature of the signaling molecule, it may either bind to and activate a receptor protein embedded in the plasma membrane, or it may move across the plasma membrane and bind to a receptor protein in the cytoplasm
Explanation:
Which statement is true of X chromosomes?
A. Women have two of them.
B. Half of the babies born do not save them.
C. Only women have them.
Đ. Only men have them
Describe how photosynthesis transforms energy from sunlight to chemical energy?
Answer:
Most life on Earth depends on photosynthesis.The process is carried out by plants, algae, and some types of bacteria, which capture energy from sunlight to produce oxygen (O2) and chemical energy stored in glucose (a sugar). Herbivores then obtain this energy by eating plants, and carnivores obtain it by eating herbivores.
Explanation:
Which organisms are heterotrophs?
photosynthesizers
producers
consumers
plants
Answer:
consumers
Explanation:
Heterotrophs don't make their food.
Answer:
it's C
Explanation:
got 100 on edge
how many copies of each chromosome are contained in each of the daughter cells resulting from meiosis?
Answer:
Each daughter cell will have half of the original 46 chromosomes, or 23 chromosomes. Each chromosome consists of 2 sister chromatids. The daughter cells now move in to the third and final phase of meiosis: meiosis II. At the end of meiosis I there are two haploid cells.
Explanation:
Hope this helps.
Each daughter cell has 23 of the 46 chromosomes. Sister chromatids make up each chromosome. Daughter cells enter meiosis II, the final step. Two haploid cells result from meiosis I.
What is meiosis?Meiosis is a specialized kind of cell division that occurs in the germ cells of animals that reproduce sexually. This form of cell division is responsible for the production of gametes, such as sperm and egg cells. This process requires two rounds of cell division, and at the end of it, there are four cells that each have a single copy of each chromosome.
There are 46 chromosomes total, and each daughter cell has 23 of them. Each chromosome is composed of two sister chromatids. In the second and last stage of meiosis, daughter cells participate. Meiosis I always results in the formation of two haploid cells.
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Briefly explain the evolution of oxygen on earth.
Answer:
The answer is tiny organisms known as cyanobacteria, or blue-green algae. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen. ... "What it looks like is that oxygen was first produced somewhere around 2.7 billion to 2.8 billon years ago.
Explanation:
Which sport, which spread to the region from Europe, is the most popular in North Africa?
A football (soccer)
В. baseball
С. cricket
D basketball
Answer:
A.Football
Explanation:
Correct me if im wrong.
Answer:
cricket
Explanation:
cricket is the answer
Which of the following objects will float in water based on there density?
Hint: density of water is 1 g/cm3
Lithium 0.534 g/cm3
Coal 1.1 g/cm3
Magnesium 1.7 g/cm3
Uranium 18.7 g/cm3
Answer:lithium
Explanation:
The density of lithium is smaller than that of water.
what is the function of allolactose in regulation of the lac operon?
Answer:
Inducer
Explanation:
Allolactose binds to the lac repressor and makes it change shape so it can no longer bind DNA. Allolactose is an example of an inducer, a small molecule that triggers expression of a gene or operon.
Answer:
Allolactose binds to the lac repressor and makes it change shape so it can no longer bind DNA. Allolactose is an example of an inducer, a small molecule that triggers expression of a gene or operon.
(I need help) The pedigree chart below shows the individuals in a family who exhibit a certain trait. Based on the information in the chart, what are the chances that a second child born to couple 4–5 in the third generation will show the trait?
Key:
Circle—Female
Square—Male
Green—Exhibits trait"
A. 25 percent
B. 50 percent
C. 100 percent
D. 0 percent
Answer:
50% chance
Explanation:
I took the test you can trust me
The chances that a second child born will be 50%.
What is a pedigree chart?Pedigrees charts are used to examine the pattern of inheritance of a particular trait in a family. It shows relationships between family members and individuals which have certain genetic pathogenic variants, traits, and diseases within a family.Therefore 50% chances are there for the second child (option b).
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A team of deep-sea divers and biologists is exploring the open ocean. As team members dive downward from the surface, they observe significant changes to the ocean community at a depth of about 200 meters. What is the main cause of the changes at this depth?
A. loss of brightness of the water
B. increasing salinity of the water
C. increasing temperature of the water
D. decreased oxygen concentration of water
Answer:
A
Explanation:
sunlight is the main change. sun light cannot penetrate into the deep layers of the ocean and availability of oxygen is also low there. this causes the considerable amount of organisms to live in the upper layers of the ocean and we can only observe decomposing organisms in the deeper layers!
From the types of light that reach Earth's surface, which do you think could be causing skin cancer?
Explain your reasoning.
The type of light that could cause skin cancer is the ultraviolet (UV) light rays. The following reasons are further explained why they harm the skin.
What is ultraviolet (UV) light?The ultraviolet light is a type of electromagnetic radiation that possess a shorter wavelength than the visible light.
The solar radiation from the sun that reaches the earth planet is made up of the following:
visible light,Infrared rays andultraviolet light rays.The ultraviolet light is harmful to the skin when exposed to it for a long time. This can damage the DNA of the skin cells which can lead to abnormal proliferation or uncontrolled growing of the cells which eventually causes cancer.
Therefore, the type of light that could cause skin cancer is the ultraviolet (UV) light rays.
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What do the arrows mean on a food web or food chain
Answer: It represents the flow of energy in an ecosystem. It indicates which direction the energy and nutrients will flow. It shows the relationship between organisms.
PLEASE HELP, WILL GIVE BRAINLIEST
the microorgansims which contains chlorophyll
During one year, the birthrate in a country is 28 births per 1000 people, and the death rate is six deaths per 1000 people. What is the population growth rate?
Answer: 22
Explanation: 28/1000-6/1000=22/1000
Birth rate is the births per 1000 people which is subtracted by the death rate which is the deaths per 1000 people, this phenomenon is known as Population growth rate. So, 22/1000 is the population growth rate for this.
What is Birth Rate?Birth rate is the total number of people born per year per 1000 in the population. Birth rate is also known as Natality.
For example, if 65 births occur per year per 1000 individuals, the birth rate is 65. If it is expressed in the percentage, it is 6.5 per 100 or 65%.
Population is divided into many parts like Juveniles (Period before puberty), adults and Post reproductive adults. Birth rate is higher than the death rate as the population is younger, the faster that population grows.
When the birth rate is expressed as per the age group, this is called the standardized birth rate. Birth Rate is determined by the ratio between the number of live births in a population during a year and total mid-year population for the same year multiplied by 1000.
Thus, birth rate is the births per 1000 people which is subtracted by the death rate which is the deaths per 1000 people, this phenomenon is known as Population growth rate. So, 22/1000 is the population growth rate for this.
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Where does cellular respiration occur? (1 point)
O chlorophyll
O mitochondria
O bacteria
O lungs
Answer:
Mitochondria
Explanation:
Plants.
Answer:
b.mitochanrida
Explanation:
Describe how bacteria are used to produce enzymes for washing powders.
Answer:
By using genetic engineering to insert the gene for the desired enzyme into the bacterial chromosome, then growing large amounts of the modified bacteria in fermenters.
Explanation:
Answer:
Bacteria such as fungi or algae are inserted in fermenter and feedstock such as glucose, amino acid, sucrose are inserted to be a source of food for them.
Then they are left for a time for the bacteria to reproduce more and to produce more enzymes in their cells, Then if the enzymes are extracellular they are extracted directly from the filtrate, if they are intercellular they are separated from the feedstock and crushed to be separated with any solvent such as water.
By using genetic engineering to insert the gene for the desired enzyme into the bacterial chromosome, then growing large amounts of the modified bacteria in fermenters.
Explanation:
Cholera bacteria causes sever diarrhoea. These bacteria spread rapidly when sewage is not piped away. Why is this?
Answer:
Because cholera bacteria rapidly multiplies in areas with improper sanitation and untreated water that people can drink.
When people drink this water, they get severe diarrhoea.
Guys please help me this is my second post lol- help asappp pls
How are coastal ecosystems a major source of oxygen for the rest of Earths waters?
Answer:
The ocean produces oxygen through the plants (phytoplankton, kelp, and algal plankton) that live in it.
Explanation:
when does cognito farm use antibiotics on its cattle?
Answer:
Only when they are sick.
Explanation:
what cells release histamine during allergic responses
Answer:
Histamine is a substance that is released by the body during an allergic reaction. Mast cells, which are a type of white blood cell, release the histamine, and this triggers a process which is most commonly referred to as the “inflammatory immune reaction”.
Explanation:
Antihistamine solutions can reduce allergies. I am allergic to mosquito bites.
The cells release histamine during allergic responses are the mast cells.
What types of cells are involved in allergy?Eosinophils, mast cells, and basophils all have been first diagnosed and defined with the aid of using Paul Ehrlich withinside the past due nineteenth century. Since then, it has end up clean that those 3 cells kinds have an awful lot extra in not unusualplace than their popularity with the aid of using the equal scientist.
Mast cells are multifunctional bone marrow-derived tissue-residing cells which might be the principal manufacturer of histamine withinside the frame. H1R are expressed in lots of cells, along with mast cells, and are concerned in Type 1 hypersensitive reaction reactions.
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How do cells in an embryo become different types of cells?
Answer:
The zygote divides into multiple cells in a process known as cleavage, triggering the beginning of embryonic differentiation. During cleavage, the zygote divides but maintains its size in the process. ... Cells in these three layers will give rise to different parts of the organism. The endoderm eventually becomes the gut.
Explanation:
The zygote divides into multiple cells in a process known as cleavage, triggering the beginning of embryonic differentiation. During cleavage, the zygote divides but maintains its size in the process. ... Cells in these three layers will give rise to different parts of the organism. The endoderm eventually becomes the gut.
responsible for the fact that organic molecules no longer spontaneously form on Earth?
Answer:
the experiment with meat sealed in a jar and maggots did not spawn out of thin air
Explanation:
which body system is responsible for producing the hormone adrenaline?
Answer:
In the centre (medulla)
Explanation:
Of the adrenal glands and in some neurons of the central nervous system.
Which of the following is the product of (3x2 − 1)(x2 − 4)?