Answer:
blastopore
Explanation:
Involution is the second stage after invagination during frog gastrulation. Involution occurs at the blastopore when the marginal zone cells get to the tip of the blastopore, make an inward turn and then move along the inner exterior of the outer cells sheets.
This means that the cells found at the lip of the blastopore and always undergoing change and the first of these cells to develop into the dorsal lip are the endodermal cells. Next are the mesoderm cells that form the Notochord.
1. A brown mink crossed with a silver-blue mink produced all brown offspring. When these F1 were crossed among themselves, they produced forty-seven brown animals and fifteen silver-blue animals. What are the genotypes of the parentals and the F1s
Answer:
The correct answer is -
Parental - BB and bb
F1
Genotypes: 100% Bb
F2
Genotypes: ¼ BB, ½ Bb, ¼ bb
Explanation:
It is given that a cross between a brown and a silver-blue mink produces all brown offspring and it is only possible if brown is dominant over silver blue in true breed cross, assume brown trait is represented by B and silver-blue is b then parents will be
BB and bb
B B
b Bb Bb
b Bb Bb
Cross between F1 individuals: Bb cross Bb
gametes : B, b and B, b
B b
B BB Bb
b Bb bb
the genotype of F2 : 1:2:1 = ¼ BB, ½ Bb, ¼ bb
How does natural selections take care of negative point mutations
Answer:
As mutations occur, natural selection decides which mutations will live on and which ones will die out. ... If the mutation is beneficial, the mutated organism survives to reproduce, and the mutation gets passed on to its offspring.
Explanation:
I hope it's help u
g DNA sequences that are deduced by comparing many related DNA sequences are called _____________. [ Choose ] Unlike DNA synthesis, RNA synthesis requires ______________. [ Choose ] ______________ direct RNA polymerase to the initiation site.
Answer:
consensus sequences; no primer; promoters
Explanation:
In bioinformatics, consensus sequences refer to sequences (i.e. DNA, RNA, or amino acids) that represent aligned related sequences (usually evolutionarily conserved sequences). In DNA, consensus sequences may evidence putative DNA binding sites. Transcription refers to the process of RNA synthesis by using as a template a DNA sequence. The start of DNA synthesis requires a primer (i.e. a short oligonucleotide sequence with an available hydroxyl group on the pentose sugar), whereas RNA synthesis requires no primer. Finally, promoters are DNA sequences that determine the site in which transcription of a gene by the RNA Polymerase begins. Promoter sequences are located near the transcription start site (TSS) at the 5'-end of a gene sequence, and range in size from 100 to 1000 base pairs (bp).
Which DNA sequence is complementary to the sequence: 5'-T A C G C A C C A A T A A C C A T A A T T -3'
Answer:
A T G C G T G G T T A T T G G T A T T A A
Explanation:
Question 12 of 15
A force is a push or pull.
Answer:
True
Explanation:
A force is a push or pull against something or someone
Newton's third law of motion is also known as
______/reaction.
• Write the biofuel and biogas chemical formulas. Explain why biofuel and biogas are still considered energy-dense molecules. Compare the chemical makeup of each component to carbon dioxide, which is produced when glucose is completely oxidised.
Answer:
diesel fuel is C12H23 whereas Methane is CH4.
Explanation:
The chemical formula for common diesel fuel is C12H23 while o the other hand, the formal of biogas such as Methane which is CH4. Both are organic compounds due to the presence of hydrogen and carbon. Biofuel and biogas are still considered energy-dense molecules because they have more mass and produced large amount of energy from it. The main difference between Carbondioxide gas and biofuel is that there is no hydrogen present in the formula of carbondioxide gas.
PLEASE HELP! I WILL GIVE BRAINLIEST! the factors that limit a populations growth are A.oxidation and corrostion B.climate and weather C.command and control
Hello! Let's tackle this question together.
The answer is option B.
Climate and weather have a significant monopoly over whether or not a species will survive. Say if we put a plant that has to live in hot areas in a cold place. It will die because of the climate and weather in the area. Henceworth, the answer is B.
X-inactivation is not random, the fathers x-chromosome in a daughter is always inactivated? TRUE OR FALSE
Help please!
Answer:
False
Explanation:
Because X-inactivation is random, in normal females the X chromosome inherited from the mother is active in some cells, and the X chromosome inherited from the father is active in other cells.
How many protons, neutrons, and electrons are found in a neutral atom of lithium-8?
Answer:
Three Protons
Four neutrons
Three electrons are found in a neutral atom of lithium 8
This apparatus can be used to show osmosis.
(a) Explain what happens to the level of sucrose solution in the glass tube. [3]
(b) Describe how this apparatus could be modified to measure the rate of osmosis at different temperatures. [3]
Answer:
A. The level of sucrose solution will rise in the glass tube because water molecules will pass through the semipermeable membrane into the tube as water potential is higher outside than inside the tube.
B. The apparatus can be modified to measure the rate of osmosis at different temperatures by doing the following :
1. Using a waterbath in order to heat the water and a thermometer to measure different temperatures.
2. Using a scale such as a ruler attached to the glass tube to measure the increase in height at different temperatures.
3. Using a stopwatch to record time taken for unit increase in the height of waterat different temperatures.
Explanation:
A. Osmosis is the movement of water molecules from a region of low solute concentration or high water potential to a region of high solute concentration or low water potential through a semipermeable membrane until equilibrium concentration is attained.
The movement of water molecules is based on a concentration gradient, from a region where there are more water molecules to a region where there are fewer water molecules.
The sucrose solution has a higher solute concentation but lower water potential due to fewer water molecules compared to water in the beaker, therefore, water molecules will pass through the semipermeable membrane into the glass tube resulting in an increase in the level of sucrose solution in the glass tube.
B. The apparatus can be modified to measure the rate of osmosis at different temperatures by doing the following :
1. Using a waterbath in order to heat the water and a thermometer to measure different temperatures.
2. Using a scale such as a ruler attached to the glass tube to measure the increase in height at different temperatures.
3. Using a stopwatch to record time taken for unit increase in the height of waterat different temperatures.
Los peroxisomas tienen por función
Los peroxisomas juegan un papel clave en la oxidación de biomoléculas específicas. También contribuyen a la biosíntesis de lípidos de membrana conocidos como plasmalógenos. En las células vegetales, los peroxisomas llevan a cabo funciones adicionales, incluido el reciclaje de carbono del fosfoglicolato durante la fotorrespiración.
how scientists are able to determine climate information by just looking at tree rings? (how does it work?)
Explanation:
Because trees are sensitive to local climate conditions, such as rain and temperature, they give scientists some information about that area's local climate in the past. For example, tree rings usually grow wider in warm, wet years and they are thinner in years when it is cold and dry.
Answer:
Explanation:
Climate scientists compare the tree growth records to local weather records. For locations where a good statistical match exists between tree growth and temperature or precipitation during the period of overlap, the ring widths can be used to estimate past temperature or precipitation over the lifetime of the tree.
The diagram shows the human alimentary canal. In which parts does peristalsis take place? plss be sure abt it
Answer:
i think answer is 3 and 4
Explanation:
peristalsis is located at esophagus and in our digestive system
The parts where peristalsis will take place are ; ( C ) parts 3 and 4
Peristalsis is a series of muscle contraction occurring in the digestive system of Humans also these series of muscle contraction can be seen in tubes connecting the human kidney and bladder as well.
From the diagram parts 3 ( esophagus )and 4 ( intestines ) are part of the human digestive system and peristalsis is very evident in these regions in the human body.
Hence we can conclude that The parts where peristalsis will take place are 3 and 4
Learn more : https://brainly.com/question/19838720
Only a very few flowering plants have been able to invade the oceans. But the few marine ones are very successful. What are some reasons for the small number of marine flowering plants
Answer:
1. High osmotic pressure due to the hypersaline nature of marine habitats
2. The dependence of flowering plants on pollinating insects for fertilization. These insect pollinators are however, absent in the marine environment.
3. Competition from already-established sea weeds and grasses provides another challenge to flowering plants invadingnthe oceans.
4. Constant changes in the environment as well as temperature changes too
Explanation:
The marine environment is a hypersaline environment with a high salt concentration relative to that of the plant cell. Due to high salt concentration of the marine environment, their is high osmotic pressure on living oragnisms found therein. Organisms must have well-adapted osmo-regulatory mechanisms to counteract the high osmotic pressure of their environment. Therefore, flowering plants face the challenge of removing excess salt from their cells or else lose water to their environment, hence resulting in the death of the plant. However, most flowering plants lack this ability and thus, have found it difficult to invade the oceans.
Flowering plants depends on insect-pollinators for fertilization. However, these insect are not found in the oceans, and as such, it is difficult for flowering plants to invade the oceans.
Well-adapted seaweeds and grasses serve as competitors for any invading flowering plant. Since the flowering plants are not yet adapted for life in marine habitats, they lose out in this competition.
The oceans are constantly in a state of frequent turbulence and change due to tides and currents. Also, the temperature of the oceans are very low and fluctuations in the temperatures of the ocean do occur, utimately serving as obstacles to invading flowering plants to adapt to life in the oceans and seas.
I am doing this right the horns question
may I please get help on these 2 questions
re and a couple with the same
Explanation:
hi there I am just emailing to confirm the
and then he was ffg
Why are there two versions of chromosomes
Answer:
See below
Explanation:
There are two different types of chromosomes coming from the ribosomes of a single cell. This is simply because you inherit traits from both your mother and father when you are given birth to. So, there are two types of genes which do not pair and therefore form two types of chromosomes.
Which of the following is the most susceptible to damage by pollution in the air and
precipitation
A. The roots of trees
B. Trees at high elevations
C. Birds that migrate seasonally
D. Plants that grow in lakes or rivers
Answer:
B) Trees at high elevations
Explanation:
The atmospheric conditions and precipitation toxicity is most likely to affect trees at high elevations more so than the other answers.
The tree leaves, which are the main key to the tree's photosynthesis, absorb the oxygen and Co2 from the air, which are converted into nutrients. Without proper nutrients, the trees may die out.
What is the mechanism by which binding of testosterone to the testosterone receptor leads to upregulated gene transcription
Answer:
This binding causes a conformational change in the receptor which enters into the nucleus and binds DNA to activate transcription
Explanation:
Testosterone is a steroid hormone responsible for inducing protein synthesis and growth of tissues with androgen receptors. Testosterone receptors, also known as androgen receptors, are a class of nuclear receptors activated by binding androgenic hormones (e.g. testosterone) in the cytoplasm, whose binding induces a conformational change of the receptors that are subsequently translocated to the nucleus. Within the cell nucleus, these activated receptors form homodimers that bind DNA in order to promote the transcription of target genes capable of regulating cell growth, cell cycle progression and survival.
Neanderthals differed from modern humans in: A. long (front-to-back), vertically low skull shape B. having smaller brain size than modern humans C. Having smaller incisor teeth than modern humans D. Creating less complicated stone tools than modern humans
Answer:
A. long (front-to-back), vertically low skull shape
Explanation:
The Neanderthals had a different body structure than doe the present modern humans have. The had a more robust well-built structure and had a distinctive morphological feature. Research suggests they were stronger than modern man thought they were slightly shorter than modern humans. They had a noticeable face, a chin, and a forehead slope.Certain characteristics allow animals to survive in one environment but not in another.
Which two statements support the claim that an Arctic wolf can NOT survive in the desert? A. It has two thick layers of fur. B. It has a thick layer of body fat. C. It hunts over a large area of land. D. It has large eyes to see better at night. E. It has light-colored fur to reflect sunlight.
Answer:
A and either B or C
Explanation:
check my reasoning cause i'm not 100% percent sure most likely the wolf would die from heat due to the layers of fur and body fat. also c and d have nothing to do with the wolf not being able to survive, in fact c is beneficial
An organisms phenotype is
A. Its parents genes
B. Its genetic make up
C. lts physical appearance
D. Its heterozygosity
Answer:
Explanation:
It's physical appearance
Which paint should be used on the absorber plate if it is designed to absorb the greatest possible amount of insolation? *
What type of natural selection do you think is acting on these bugs if we consider the golden rain tree bugs and balloon vines bugs together as one group
Complete question:
Question 49 (1 point) The following questions refer to the description below. You have read that soapberry bugs, Jadera haematoloma, adapt to available food sources. For example, in southern Florida, soapberry bugs feed on seeds of a native plant, the balloon vine. In central Florida, the balloon vine is rare and soapberry bugs have switched to eating seeds of an introduced species, the golden rain tree. The seeds of the golden rain tree fruits are much closer to the fruit surface than the seeds of the native balloon vine fruit. As a result, natural selection results in beaks that are shorter in soapberry bugs that utilize golden rain tree fruits than those that feed on balloon vine fruit seeds.
What type of natural selection do you think is acting on these bugs if we consider the golden rain tree bugs and balloon vines bugs together as one group?
DirectionalStabilizingDisruptive (diversifying)Answer:
Disruptive (diversifying)Explanation:
Due to technical problems, you will find the complete explanation in the attached files
_______ are large geographical areas that have similar climate and weather patterns.
a.Symbioses
b. Zones of tolerance
c. Biomes
d. Communitie
Answer:
i think its c.............
Answer:
The answer is C. Biomes
Explanation:
Large areas with similar climate and weather are called biomes.
Which of the following kinds of cells perform basic functions such as obtaining energy from food?
Plant cells, but not animal cells
Animal cells, but not plant cells
Both plant cells and animal cells
Neither animal cells nor plant cells
Answer:
Both plant and animal cells
Explanation:
Answer:both plant cells and animal cells
Explanation:generally, cells obtain energy from food during cellular respiration where glycolysis takes place
please help with my biology
Answer:
apoptosis
Explanation:
Apoptosis is programmed cell death. Basically a cell "pops" itself off.
How are igneous and sedimentary rocks similar?
Answer:
Igneous rocks form as magma cools below ground or lava cools on the surface. Sedimentary rocks are made from the eroded particles of other rocks or from mineral deposits left when water evaporates. Metamorphic rocks form when any existing rock undergoes intense and prolonged exposure to heat and pressure.
Explanation:
Observe: Hold your cursor over one of the insects. The two rod-like structures under Genotype on the right side of the Gizmo represent chromosomes. The three letters next to each chromosome represent alleles. Which alleles does the insect have
Complete question:
Question: Where does variation in a population come from?
1. Observe: Hold your cursor over one of the insects. The two rod-like structures under the Genotype on the right side of the Gizmo represents chromosomes. The three letters next to each chromosome represent alleles.
Which alleles does the insect have? ____________________________________________
The alleles carried on an organism’s chromosomes make up the organism’s genotype
Answer:
Allele = WGenotype = WWW WWWExplanation:
First, you need to set red = 100, gree = 255, and blue = 50.You will see that the average fitness of individuals changed to 53%. Natural selection should be selected. Now, you need to click on any of the insects, and it will appear the chromosome on the right. You will see the word Genotype, and under it, you will see the chromatids.You will see that each chromatid has three alleles. Next to each allele, you will see which version of the gene is (W). In this particular example, all the alleles are the same, so all of them express white. Both chromatids carry only W alleles.
Think about alleles as an alternative form of the gene. So on this chromosome, we have only three genes but eight possible alternatives, which will be coding for white, red, blue, green, cyan, magenta, yellow, or black. The color expression will depend on the individual´s genotype.
In this case, the selected insect carries only the W allele, and its phenotype is white. The genotype of this insect is WWW WWW.
Note: If you click on any other insect, you will find the same genotype for all of them.
However, consider that depending on the environmental conditions and the selective pressures, these alleles might change. Individuals might carry other alleles that code for another color instead of having only W alleles.
You will find the image in the attached files.