The model represents the change in the DNA content of a cell during the cell cycle. Which table shows two steps of DNA replication?
Answers
Answer:
The life cycle of eukaryotic cells can generally be divided into four stages and a typical cell cycle is shown in Figure 2.13. When a cell is produced through fertilization or cell division, there is usually a lag before it undergoes DNA synthesis (replication). This lag period is called Gap 1 (G1), and ends with the onset of the DNA synthesis (S) phase, during which each chromosome is replicated. Following replication, there may be another lag, called Gap 2 (G2), before mitosis (M). Cells undergoing meiosis do not usually have a G2 phase. Interphase is as term used to include those phases of the cell cycle excluding mitosis and meiosis. Many variants of this generalized cell cycle also exist. Some cells never leave G1 phase, and are said to enter a permanent, non-dividing stage called G0. On the other hand, some cells undergo many rounds of DNA synthesis (S) without any mitosis or cell division, leading to endoreduplication. Understanding the control of the cell cycle is an active area of research, particularly because of the relationship between cell division and cancer.
Explanation:
The amount of DNA within a cell changes following each of the following events: fertilization, DNA synthesis, mitosis, and meiosis (Fig 2.14). We use “c” to represent the DNA content in a cell, and “n” to represent the number of complete sets of chromosomes. In a gamete (i.e. sperm or egg), the amount of DNA is 1c, and the number of chromosomes is 1n. Upon fertilization, both the DNA content and the number of chromosomes doubles to 2c and 2n, respectively. Following DNA replication, the DNA content doubles again to 4c, but each pair of sister chromatids is still counted as a single chromosome (a replicated chromosome), so the number of chromosomes remains unchanged at 2n. If the cell undergoes mitosis, each daughter cell will return to 2c and 2n, because it will receive half of the DNA, and one of each pair of sister chromatids. In contrast, the 4 cells that come from meiosis of a 2n, 4c cell are each 1c and 1n, since each pair of sister chromatids, and each pair of homologous chromosomes, divides during meiosis.
Related Questions
Question 4 of 10
2 Points
Which factor helps determine the fertility rate of a group of people?
O A. Death rate
B. Education
O c. Consumption rate
D. Farmland
SUBMIT
Answers
Answer:
education
Explanation:
Identify the structures labeled in the diagram.
Label A
Golgi apparatus
mitochondrion
nucleus
DONE
Answers
Answer:
C
Explanation
Got it right on edge
Answer:
label A: nucleus label B: ribosomes
Explanation:
trust me.
Describe how incomplete dominance and codominance, two non-mendelian traits, are different from each other.
Answers
Answer:
Incomplete dominance occurs when the dominant allele did not completely mask the effect of the recessive allele so that, the recessive allele could manifest some of its traits.Therefore the offspring exhibits some phenotype which reflects the blends of the two traits.( four O'clock flower)
However, in co-dominance(e.g AB blood group) none of the dominant allele is completely dominant over one another.That is the two allele of the same gene are present in the same offspring.Therefore the alleles shows their dominating effects, in the offspring, but no blend of the alleles as in the incomplete allele.
Explanation:
write any three differences between metals and non-metals?
Answers
Answer:
Differences between metals and non-metals
Explanation:
Metals are elements that have luster.
Non-metals are elements that do not have luster. They are dull.
There are one to three electrons in the outer shell of the metals.
There are four to eight electrons in the outer shell of the non-metals.
Metals are a good conductor of heat and electricity.
Non-metals are the bad conductors of heat and electricity.
Metals are malleable, ductile, and sonorous.
Non-metals are brittle, non-ductile, and non-sonorous.
Plzzz help
Explain how deforestation affects the carbon cycle
Answers
Answer:
Deforestation has an effect on the Carbon Cycle also known as the Greenhouse gas effect and global warming. Trees and forest balance the amount of Carbon in the atmosphere through the process of photosynthesis in which plants make their own food with carbon dioxide. ... This excess heat warms the earth.
which type of macromolecule is a new drug most likely to be? A. a lipid B. a nucleic acid C. a protein D. a carbohydrate
Answers
Answer:
i would go with b
Explanation:
Chlorophylla is a critical pigment in plants that not only gives many of them their characteristic green color, but
is also important in the process capturing light energy from the sun in order to drive the process of
photosynthesis.
What is the most likely cell structure in which chlorophyll a would be located?
Answers
Answer:
In the plant cell it's found in the chloroplast.
Hope this helps.
The data in the graph are the result of a paramecium being placed in a hypertonic salt solution. A graph entitled Paramecium Contractile Vacuole Contractions has salt concentration on the horizontal axis and contractions per minute on the vertical axis. A very low salt concentration has 30 contractions per minute, low: 22, medium: 15, high: 8, very-high: 2. What change would most improve the usefulness of the graph? Replace the concentration descriptions with actual values. Plot contractions per second instead of contractions per minute. Remove the plotted points and just keep the line. Remove the name of the organism from the title.
Answers
Answer:
Replace the concentration descriptions with actual values
Explanation:
For results of this nature to mean much, they need to be able to be reproduced by a different experimenter. In order to be able to do that, the experimenter must be able to reproduce the salt concentrations. The graph would be more useful if it had the actual concentration values.
Answer:
Replace the concentration descriptions with actual values
Explanation:
he diagram shows one step in the process of protein synthesis. A step in the process of protein synthesis is shown. In this step, the t R N A is bonding to the m R N A strand. Which step is shown? transpiration translocation transcription translation
Answers
Answer:
The diagram shows one step in the process of protein synthesis.
A D N A strand. The R N A polymerase encircles a portion of the D N A strand, pulling it apart.
The process shown in the diagram is called
⇒ transcription.**
Explanation:
Red-flowered snapdragons are crossed with white-flowered snapdragons, producing all pink snapdragons in the F1 generation. What would you expect if you crossed pink with pink? The choices are... (1/2, 1/4, 3/4) red, (1/2, 1/4, 3/4) pink, (1/2, 1/4, 3/4) white.
Answers
Answer:
Red (1/4), Pink (1/2), white (1/4)
Explanation:
This question involves a single gene coding for flower colour in the snapdragon plants. The gene exhibits incomplete dominance, because the allele for red color (R) is incompletely dominant over the allele for white color (W), hence an intermediate phenotype is produced as pink color (RW).
The pink colored snapdragon plant is produced in the F1 generation. When these F1 offsprings are crossed i.e. RW (pink) × RW (pink), gametes with R and W alleles are produced by each F1 parent.
Using these gametes in a punnet square (see attached image), four possible offsprings with genotypes; RR, RW, RW and WW will be produced in the F2 generation.
RR offsprings (1/4)- Red flowered
RW offsprings (2/4 or 1/2)- Pink flowered
WW offsprings (1/4)- White flowered
¿5. El sistema circulatorio humano consta de vasos, corazón y líquidos circulatorios. Los tipos de vasos son los siguientes: a. _____________________________________________________________________ b. _____________________________________________________________________ c. _____________________________________________________________________
Answers
Answer:
La respuesta correcta es "a. arterias, b. venas; y c. capilares".
Explanation:
Los vasos sanguíneos son una serie de conductos a través de los cuales el cuerpo transporta la sangre, asegurando que todas las células del cuerpo tenga acceso a oxígeno, elemento necesario para la respiración celular. Hay tres tipos de vasos sanguíneos: arterias, venas y capilares. Las arterias llevan la sangre del corazón a los órganos, las venas transportan la sangre de los órganos al corazón y los capilares son vasos muy pequeñitos que llegan a las partes más pequeñas del cuerpo.
Write about the sand grouse ands it’s adaptation to the environment. Just be 5-7 sentences long. Please help me
Answers
Answer:
Sandgrouse is the common name for Pteroclidae, a family of sixteen species of birds, members of the order Pterocliformes. They are traditionally placed in two genera. The two central Asian species are classified as Syrhaptes. How the sand grouse adapt to environment. The dense layer of under down which helps insulate the bird from extremes of heat and cold. The feathers of the belly are specially adapted for absorbing water and retaining it. Allowing adults particularly males to carry water to chicks that may be many miles away from watering holes.
Explanation:
What happens to the dirt and matrix from each grid? it is discarded as trash it is burned to avoid contamination of the site it is collected for further analysis it is put back in the grid after the fossils have been removed?
Answers
Collection for further analysis is the action done to the dirt and matrix from each grid.
What is a Fossil?This is the remain of plant and animal which has been preserved in the earth crust.
The dirt gotten from the matrix is usually kept for further testing and analysis in the laboratory.
Read more about Fossil here https://brainly.com/question/11829803
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How do enzymes help digestion?
Answers
Answer:
Enzymes are essential for healthy digestion.
Explanation:
There are three types of digestive enzymes depending on the type of food on which they act.
Lipases are those that digest fat. After its breakdown into fatty acids and glycerin, they are synthesized by the pancreas.
Proteases are the ones that break the peptide bonds of proteins, reducing them to organic monomers called amino acids. They originate in the stomach or pancreas.
The so-called amylases break down starches and complex sugars in the diet, by breaking the glucidic bonds, releasing mososaccharides (especially glucose). There are 3 types of amylases: ptyaline, pancreatic amylase, and duodenal amylase.
The benefits of these enzymes are:
- They help digestion and reduce the so-called "acidity".
- They reduce the feeling of bloating and gas.
- Improves the digestion of dairy products.
- Food allergies decrease due to good protein digestion.
- They improve the conditions of hiatus hernia and ulcers.
Which three countries would you expect to have the highest standard of living? Drag the labels to the appropriate country?
Answers
Answer:
Denmark , Switzerland and Finland
Explanation:
Denmark , Switzerland and Finland are the top three countries in the world having highest standard of living. Standard of living means the availability of basic items, wealth, goods etc to the specific people or region. the people of these above three countries are wealthier, having better financial condition and has a comfort life as compared to people of other countries. The main reason of high standard of living of the people of these countries that these countries are developed whose economy is better than other poor countries.
Which form of nitrogen in the soil is usable by organisms?
Answers
Answer:
Amonnia the s the userble form of nitrogen by organisms in the soil
Answer:
Nitrate and Ammonia
Explanation:
Nitrate used for plant growth
Ammonia used directly in proteins
Describe how Stella’s view of these plant cells and their parts changed as she transitioned through the three levels of magnification. Be sure to identify at least one cell structure or part of the leaf cells in your description.
Answers
Answer:
From lower to higher level of magnification, the stella's view about plant cells.
Explanation:
At lower magnification, the structure of plant cell is not clear by stella but with the increase of magnification, the cell structure becomes enlarge and clearly seen different structures of plant cell by the individual. The boundary of plant cell is known as epidermis. The upper boundary of plant cell is upper epidermis and the lower boundary of plant cell is lower epidermis.
A microbiologist is in the process of classifying a newly discovered organism. Its characteristics include: · eukaryotic · multicellular · reproduces by spores · motile in some stage of its life cycle · decomposer Which type of organism is it most likely to be? club fungus fungus-like protist plant-like protist sac fungus
Answers
Answer:
fungus-like protist
Explanation:
A fungus mostly has those characteristics. Most of them are multicellular eukaryotes -- the exception being yeast, which are unicellular eukaryotes. They can reproduce by spores and are decomposers; they even consume via absorptive feeding!
First, it's definitely not plant-like, as it is a decomposer, and there is no indication that it can produce its own food. It doesn't entirely seem like a fungus either, so the answer is a fungus-like protist.
Answer:
The person above is correct. They should get brainliest.
Explanation:
Edge 2021
How do some cells become brain cells and others become skin cells, when the DNA in all the cells is exactly the same?
Answers
Answer:
it has the ability to turn off genes
which of the following is true for identical twins? A . they can have different genes b. they can express the same genes differently c. they can have different fathers d. they are attached until just before birth
Answers
Answer:
b. they can express the same genes
What are the characteristics of prokaryotes? A prokaryote lacks a well-defined nucleus. A prokaryote cannot perform basic life functions. A prokaryote lacks cell organelles. A prokaryote is larger than a eukaryote.
Answers
Answer:
Lacks an well defined nucleus
Explanation:
Answer:
Answer:
Lacks an well defined nucleus
Explanation:
Explanation:
Why is variation important for natural selection
Answers
Explanation:
genetic variation is important as it allowed natural selection to increase or decrease frequency of alleles already in the population. its also important to a population because it enables some individuals to adapt to the environment while maintaining the survival of the population.
describe respiration
Answers
Answer:
Respiration is a person's breathing and the movement of air into and out of the lungs.
Explanation:
The respiratory system provides oxygen to body tissues for cellular respiration, removes the waste product carbon dioxide.
a) The important factor in osmosis is not the number of molecules. Instead, it is the number of particles in a given volume of solution. For example, one glucose molecule dissolved in water yields one particle, but one NaCl molecule can yield two ions: Na+ and Cl-. Water moves osmotically in response to the total concentration of particles in the solution.
If there is a 10% glucose solution on one side of a semipermeable membrane and 5% salt solution on the other side, what will most likely happen to the flow of water? (1 point)
Answers
Which statement accurately describes dark matter?
1: It is the same as dark energy.
2: It is well understood by scientists.
3 :It does not emit electromagnetic radiation.
4: It can be observed by shifts in red and blue light.
Answers
Answer:
1
Explanation:
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Description
Dark matter is a form of matter thought to account for approximately 85% of the matter in the universe and about a quarter of its total mass–energy density or about 2.241×10−27 kg/m3. .
The "master controller" gland is the _____. thyroid adrenal pituitary thalamus
Answers
Answer:
Hypothalamus is the correct answer to the given question.
Explanation:
Hypothalamus in the brain is the tiny portion of the mind also the Hypothalamus is situated at the foot of the nervous system .The Hypothalamus is just next to the pituitary gland. Hypothalamus is produced by a variety of nucleus as well as the nervous fibers. It's own neuronal links
The main objective of Hypothalamus is to hormonal fluctuation as well as controlling the temperature of the body.All the other option is not the master controller gland that's why these are incorrect option .Answer:
The pituitary gland is the master controller gland.
Explanation:
I just did this: The pituitary gland is sometimes called the "master" gland of the endocrine system because it controls the functions of many of the other endocrine glands.
state any two conditions essential
for good health
Answers
Answer:
clean
Explanation:
privacy comfortable easy to use
Answer:
Two conditions essential for good health are: mental and social well-being. Better surroundings or -environment.
Explanation:
a. ___________________ is the study of heredity.
b. In all living things, ________________ determine the traits and make each creature unique.
c. An organism that has a __________ gene pair will always have two genes for a particular trait.
d. __________________ is considered to be the discoverer of the basis of genetic theory.
e. Hair color and eye color are known as characteristics or inherited ______________________.
f. Dominant genes are _________________ , whereas recessive genes do not always show.
g. _______________ is the transfer of traits from parents to their offspring.
h. A _______________ organism is one that is the offspring of two closely related organisms that are not from the same species.
i. ___________________________- determines what proteins a cell will produce.
j. The _________________________ is a chart used to predict the traits for the offspring from a cross.
Answers
b - genes
c -
d -Gregor Mendel
e - inherited
f -
g- inheritance
h -
I - DNA
J - punnet square
I’ve already done this class I forgot the other answers but I’ll try to figure them out for you and respond again! Hope this helps for now
Answer:
a.Genetics
b. Genes
c. homozygous
d. Gregor Mendel
e. traits
f. genotypes
g. Inheritance
h. hybrid
i. DNA
j. Inheritance
All answers are 100% correct
Which pair of terms best describes a wooden table? biotic and nonliving biotic and living abiotic and nonliving abiotic and living
Answers
Answer:
The liver is one of the vital organs of the body, responsible for hundreds of chemical actions that the body needs to survive. It is also a gland because it secretes chemicals that are used by other parts of the body.
Explanation:
Explain
two effects of
human factor on environmental hazards.
Answers
Answer:
1) Radioactivity, this is an exposure dependent risk of some cancers notably leukaemia.
2) Tobacco smoking, this damages their health.
Explanation:
I hope it helps.