Answer:
Cdc stands for cell division cycle and cdk is cyclin dependent kinase.
Explanation:
Cdc and cdks are involves the process of cell cycle. The cdk are the enzymes that attaches phosphate group to different molecules. The phosphorylation process allows the cell to move to next stage in the cell cycle.
The Cdc protein allows the removal of residues that are attached to inhibitory phosphate. This cdc protein control cell cycle progression. This allows the cell to move through cell cycle stages that includes S phase and mitosis.
Where does aerobic respiration take place in prokaryotes?
Aerobic respiration in prokaryotes occurs in the cell membrane, as they lack mitochondria. Not all prokaryotes use aerobic respiration; some are anaerobic or facultatively anaerobic, adjusting their metabolic process according to the presence of oxygen.
Aerobic respiration in prokaryotes, which includes bacteria and archaea, takes place in the cell membrane as they lack the organelles found in eukaryotes. Unlike eukaryotes, where aerobic respiration occurs in the mitochondria, prokaryotes carry out this process on their cell membrane since they do not possess membrane-bound organelles. It's important to note that not all prokaryotes are capable of aerobic respiration; some are strictly anaerobic or can switch between aerobic and anaerobic metabolism (facultative anaerobes). However, for those prokaryotes that do engage in aerobic respiration, the cell membrane is the site where the electron transport chain is located, and where ATP is generated by oxidizing nutrients using oxygen as the final electron acceptor.
Which physical factors MOST influence a marine biome?
A) tides, oxygen, costal hotel development
B) sunlight, fishing boats, whale population
C) wave motion, salinity, atmospheric pressure
D) plankton, water temperature, sand composition
The diagram shows the stages of the eukaryotic cell cycle.
Which stage is labeled E in the diagram?
mitosis
interphase
S phase
G0 phase
The right answer is interphase.
In both eukaryotic and prokaryotic cells, the interphase is the period of the cell cycle that is characterized by an increase in cell volume, the cell transcribes its genes and the chromosomes are duplicated. It can be subdivided into several phases:
* phase G1 (growth or gap), during which the cell grows and performs the functions for which it is programmed genetically: biosynthesis of proteins, etc. It is during this phase that the young, freshly divided daughter cells grow to their final size.
* phase S (of the English synthesis, because of the synthesis of new DNA molecules), during which the chromosomal material is doubled by DNA replication. This is called chromosome duplication.
* phase G2, where the cell prepares to divide into two daughter cells. At the end of this phase, each chromosome is perfectly identical to its homolog in terms of morphology and from the point of view of the genes present, but each gene is not necessarily identical to its homologue, since generally several alleles exist.
** There is also the G0 phase, which is one of reproductive senescence. It is a possible exit from the control point at the end of G1, an alternative to the continuation of the G1 phase and the transition to the S phase. The G0 phase can be temporary or permanent and it is often induced by unfavorable conditions.
Answer:
The correct answer would be interphase.
The cell cycle is mainly divided into two phases: mitosis (M) and interphase.
Interphase is the phase in which a cell spends most of its time. It is the phase of growth and DNA replication.
It can be sub-divided into three stages:
Gap 1 (G₁) phase which is represented by letter A in the given diagram. Synthesis (S) phase in which DNA replication takes place. It is represented by letter B in the given diagram. Gap 2 (G₂) phase which is represented by letter C in the given diagram.Letter D represents mitosis (M) phase in which the actual division of the cell takes place.
The transmission electron microscope is most useful for
1. looking at the surface features of a virus
2. seeing animal tissue that is visible to the naked eye
3. studying the structures of a live paramecium
4. viewing a cell’s mitochondria in detail ...?
1. looking at the surface features of a virus
Explanation;Electron microscopes are types of microscopes that uses a beam of electrons instead of light to magnify objects up to 500,000 times the actual size. These microscopes have a higher resolving power than the light microscopes since they use electrons.There are two types of electron microscopes ; that is Scanning Electron Microscope and Transmission Electron Microscope. Transmission electron microscope are used for studying internal structures of cells. In these microscopes electromagnets are used to magnify the image by passing a beam of electrons through a thin specimen.Answer:
A looking at the surface features of a virus.
Explanation:
As blood is filtered in the excretory system, which of the following functions like a recycling center?
A.the bladder
B.Bowman's capsule
C.tubules in the kidney
D.ureters between the kidney and the bladder
Answer: C. tubules in the kidney
The chief function of kidney is the production of urine. Kidney is the excretory system of the body. The blood being filtered by the glomerulus of the nephron reaches to the renal tubule in order to reabsorb water, glucose, nutrients and ions such as sodium. All these components are reabsorbed back into the blood. Therefore, tubules in the kidney functions like a recycling center as they allow the reabsorption and reuse of valuable components before they are excreted out along with urine.
Geologists discovered fossil evidence of mesohippus, an ancestor of the modern horse. Mesohippus lived in North America about 40 million years ago. Mesohippus was about two feet tall, ran on hooves with three toes, and had large, grinding teeth. What statement is BEST supported by the fossil evidence? A) Ancient horses were once carnivores. B) Horses have evolved over the last 40 million years. C) Horses migrated from South America into North America. D) Modern-day horses share a common ancestor with all mammals.
Answer: B: Horses have envoled over the last 40 million years
Explanation:
A membrane which limits the type of molecules which will pass through it is called .
A membrane which limits the type of molecules which will pass through it is called a semi permeable membrane.
A semipermeable membrane is a membrane which can be biological or artificial, that will allow the movement of certain molecules through them by diffusion. Several factors such as pressure, concentration, temperature of the molecules on each side, and also the permeability of the membrane to each solute determine the rate of passage of the molecules.
DNA is spread out in the nucleus of a cell of non-dividing cells it is called ___________
WILL UPVOTE ALL ANSWERS
A geologist's job includes:
determining the living organisms occupying an area
determining the chemicals cycling through an area
determining the history of an area
determining the magnitude of light in an area
Which of the following two cycles are the most closely related in their role in sustaining life?
a.
carbon and nitrogen
b.
water and nitrogen
c.
carbon and oxygen
d.
nitrogen and phosphorus
Which of the following rocks forms from shells and calcium carbonate?
limestone
halite
mudstone
coal
Answer:
limestone
Explanation:
Which of the following describe(s) the role of cytotoxic T cells in the specific immune response?
I. They kill cancer cells.
II. They kill cells infected by viruses.
III. They interact with MHC-I molecules
A.II only
B.II and III only
C.I and II only
D.I and III only
E.I, II, and III
Answer: Option E is the correct answer
Explanation:
T cells are part of the adaptive immune system and have a large repertoire of receptors that allow their activation or inhibition. T lymphocytes or T cells have the ability to recognize and lyse (kill) infected or transformed cells; these transform cells could include cancer or tumor cells. This recognition is due to the contact of the T cell receptors (principally the T cell receptor) with the Major Histocompatibility Complex molecule I (also known as MHC I). When cells are infected or are transformed, the expression of these MHC I molecules are altered, and therefore it is detected by T cells as something “abnormal” and therefore release molecules that cause cell death, such as perforin, granzymes, IFN-γ and the Tumor Necrosis Factor-α. Therefore, T cells can kill cancer or infected cells and interact with MHC-I molecules.
The plasma membrane, according to the fluid-mosaic model is composed mainly of What and Proteins
1. Pigs have 38 chromosomes. Cells created during mitosis will have _____.
A<19 chromosomes
B<38 chromosomes
C<76 chromosomes
2.Dominant genes _____.
A
B
C
B
3.Humans have 46 chromosomes. A human egg cell has _____.
A<23 chromosomes
B<46 chromosomes
C<92 chromosomes
4.How can mutation positively help organisms?
A
B
C
Answer:
1.A:19 3.A:23
Explanation:
I'm sorry but i do not know what 2. and 4 means.
I know 1. and 3. because it was in biology.
Final answer:
1. Cells created during mitosis will have 38 chromosomes. 2. Dominant genes are expressed when there is at least one copy of the dominant allele present. 3. A human egg cell will have 23 chromosomes. 4. Mutation can positively help organisms by leading to the development of new traits and increasing genetic diversity.
Explanation:
1. Cells created during mitosis will have B<38 chromosomes because mitosis is a type of cell division that results in the production of two daughter cells, each with the same number of chromosomes as the parent cell. Therefore, if pigs have 38 chromosomes, the cells created during mitosis will also have 38 chromosomes.
2. Dominant genes can be represented by the letter B. Dominant genes are expressed when there is at least one copy of the dominant allele present in the genotype. This means that the dominant gene will be observed in the phenotype, even if there is also a recessive gene present.
3. A human egg cell will have A<23 chromosomes. This is because during meiosis, the process of cell division that produces gametes, the number of chromosomes is halved. As humans have 46 chromosomes in their somatic cells, the egg cell will have half that number, which is 23 chromosomes.
4. Mutation can positively help organisms in several ways. For example, a mutation can lead to the development of new traits, which can provide an advantage in a changing environment. Mutations can also increase genetic diversity within a population, which can enhance the ability of the population to adapt to different conditions.
Birds have hollow bones. explain how this is adaptive.
What are body parts similar in origin and structure called
What makes science different from other ways of study? A. Only science has theories B. Science is based on evidence 3. Science is based on art D. Only science studies only supernatural events
Final answer:
Science is different from other ways of study because it is based on evidence and is limited to what can be observed and measured. It involves testing new ideas with experiments and observations, making its conclusions reliable and factual. So the correct option is B.
Explanation:
Science is different from other ways of study because it is based on evidence and logic. Science distinguishes itself by its systematic approach to gaining knowledge about the natural world through the use of observations, reasoning, and repeated testing. This process starts with a question, which scientists attempt to answer with empirical evidence and sound reasoning.
Unlike other fields of inquiry, science deals only with things that can be observed and measured. Phenomena such as supernatural beings or events are beyond the scope of science because they cannot be observed or tested with current scientific methods. Furthermore, science is continually evolving, as its ideas are open to revision and must withstand rigorous scrutiny and experimental verification.
In contrast to other disciplines that might rely on subjective interpretation or untestable beliefs, science requires that any new ideas be testable by experiments or observations. This makes its conclusions reliable and objective. As such, areas of knowledge like morality, aesthetics, or spirituality are considered beyond the realm of scientific inquiry. They are part of what is often termed 'nonscientific' or 'metaphysical' realms.
Food chains and webs not only describe the order organisms are eaten, but they also describe the _____.
a. flow of energy in an ecosystem.
b. importance of the ecosystem.
c. health of the ecosystem.
d. animals that are all related.
During diffusion molecules move in what type of motion
it moves from higher to lower concentration
What is an organism’s niche?
Answer:
Part of a animals adaption to help it survive
Explanation:
in human excess blood glucose is stored in the liver and in muscle tissues in form of glycogen.glycogen is a long chain of glucose molecules bonded together.because of this glycogen is called a
The correct answer is that because of this glycogen is called a polysaccharide.
Hope this helps! :)
Which statement about the cell membrane is true?
A.It contains cellulose and sugars that are involved in communication.
B.It is present in animal cells only.
C.It is rigid and elastic for supporting the cell’s shape.
D.It prevents harmful substances from entering a cell.
Answer:
Option D
Explanation:
All cells including that of plants, animals, microorganisms such as bacteria, fungi, algae etc. consists of cell membrane. In-fact some of the internal cell organelles are also bound by membrane.
Cell membrane is made up of phospholipid bi-layers which consist of two essential components – a) proteins and b) Phospholipids.
This membrane is semi –permeable which means they can allow few substances to pass through it while restricts the passage of others.
Hence, it protects the cell from harmful substance in its surrounding.
Thus, option D is correct.
Thus, option D is correct.
Prokaryotes and eukaryotes are similar in all of these aspects except
Answer:
the answer is The way in which the genetic material is found.
Explanation:
The main difference between prokaryotic and eukaryotic cells is that in prokaryotic cells, the genetic material is not separated from the cytoplasm since they lack a defined nucleus, so the genetic material is dispersed in its cytoplasm, while the eukaryotes present the genetic material organized in chromosomes surrounded by a membrane that separates them from the cytoplasm.
In humans, a combination of cx chromosomes results in a female zygote and that of xy results in male zygote from whom does a male zygote inherit an X chromosome
Please Please help me!!!
On the New York seismograph, the first P wave was recorded at 9:01 UTC. UTC is the international standard on which most countries base their time. At what time (UTC) did the earthquake actually occur? Explain.
The recorded time of the first P wave on the New York seismograph was 9:01 UTC. However, considering the travel time of P waves, the earthquake actually occurred at 9:00 UTC, with the one-minute difference accounting for the waves' transit time.
Explanation:The New York seismograph recorded the first P wave at 9:01 UTC, indicating the initiation of the seismic activity. However, P waves are the fastest seismic waves and are the initial signals of an earthquake. The time lag between the P wave detection and the actual earthquake occurrence is due to the travel time of the seismic waves from the earthquake epicenter to the seismograph station.
To determine the actual time of the earthquake, we need to consider the travel time of the P waves. The P waves typically travel at an average speed of about 6 to 7 kilometers per second through the Earth's interior. Using the formula Time = Distance/Speed, we can calculate the time it took for the P wave to reach the seismograph station. Assuming a distance of 0 km (since it's the local station), the time is approximately 1.5 to 1.7 seconds. Subtracting this travel time from the recorded time of 9:01 UTC gives us the actual time of the earthquake, which is 9:00 UTC.
In summary, the 1-minute discrepancy between the recorded P wave and the actual earthquake time is attributed to the travel time of the seismic waves. By accounting for this travel time, we can accurately determine when the earthquake occurred, in this case, at 9:00 UTC.
Which of these would BEST describe what would happen to a cell in a time of low nutrient supply?
a. The cell's growth would speed up significantly, leading to longer periods of time between cell division.
b. The cell's growth would slow down significantly, leading to longer periods of time between cell division. Eliminate
c. The cell's growth would speed up significantly, leading to shorter periods of time between cell division.
d. The cell's growth would slow down significantly, leading to shorter periods of time between cell division.
The average corn yield per acre has _______ during the last forty years.
The average corn yield per acre has doubled during the last forty years.
corn yields are coming in anywhere from 130 bushels per acre (bu/acre) to 260 bu/acre, as an stadistic data.
What would happen if gametes were not haploid?
a. The offspring would have half the number of chromosomes it is supposed to have.
b. The offspring would have double the number of chromosomes it is supposed to have.
c. The offspring would be genetically identical to it's parent.
d. The offspring would be genetically different from it's parent.
During the cell cycle,
A) DNA is replicated once before mitosis and again before cytokinesis.
B) DNA is replicated during mitosis.
C) DNA is replicated before mitosis begins.
D) DNA is replicated directly after the completion of mitosis.
Answer:
dna is replicated before mitosis begins
Explanation:
DNA replication occurs during the S phase of interphase, prior to the onset of mitosis, to ensure each daughter cell has an identical set of genetic information. So the correct option is C.
Explanation:During the cell cycle, DNA is replicated before mitosis begins. This critical process of replication occurs in the Synthesis phase, or S phase, of the cell cycle, during interphase. The purpose of this replication is to ensure that each daughter cell produced after cell division will have an identical copy of the DNA, preserving the cell's genetic information.
Observations through autoradiographs indicate that none of the cells in mitosis were radioactively labeled, confirming that DNA replication does not occur during mitosis but rather beforehand. It's essential for DNA to be copied during interphase so that, during the mitotic phase, which includes mitosis and cytokinesis, each resulting daughter cell contains the same genetic content as the parent cell.
Therefore, the correct answer to the question of when DNA is replicated during the cell cycle is:
C) DNA is replicated before mitosis begins.
Population growth is limited by density-dependent factors such as _____.
predation and disease
volcanoes and earthquakes
droughts and floods
biotic and abiotic factors
The correct answer is predation and disease.
Density dependent factors are those factors, which are directly influenced by the density of a population. These factors directly influence the size and the growth of the population.
The predation and the disease are density dependent factors, as predation of a small density population would cause a significant decrease in number, so, predation is the limiting factor for the growth of the population. Same for diseases, the disease can affect most of the members of the population, and limiting its growth.
The changes in the environment and the natural calamities are density independent factor.