Which one of the following statements best describes the mechanism by which the "cell cycle control system" regulates events of the cell cycle? O Hydrophobic signaling molecules cross the plasma membrane at distinct stages in the cell cycle O Ca++ and cAMP release into the nucleus signal the progression of the cell cycle O Changes in vesicle trafficking events signal progression of the cell cycle O Changes in the cellular cytoskeleton signal progression of the cell cycle Protein phosphorylation and dephosphorylation events signal the progression of the cell cycle

Which one of the following statements best describes the mechanism by which the "cell cycle control system" regulates events of the cell cycle? O Hydrophobic signaling molecules cross the plasma membrane at distinct stages in the cell cycle O Ca++ and cAMP release into the nucleus signal the progression of the cell cycle O Changes in vesicle trafficking events signal progression of the cell cycle O Changes in the cellular cytoskeleton signal progression of the cell cycle Protein phosphorylation and dephosphorylation events signal the progression of the cell cycle

Biochemistry

6th Edition

ISBN:9781305577206

Author:Reginald H. Garrett, Charles M. Grisham

Publisher:Reginald H. Garrett, Charles M. Grisham

Chapter28: Dna Metabolism: Replication, Recombination, And Repair

Section: Chapter Questions

Problem 19P: Figure 28.11 depicts the eukaryotic cell cycle. Many cell types â€œexitâ€� the cell cycle and...

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Which of the following statements best describes the process of phase separation in cells? Proteins can assemble as liquid droplets that are not bounded by a membrane in either the cytoplasm or nucleus A protein can separate into different organelles dependent on the phase of the cell cycle Proteins that are assembled in one phase of the cell cycle and degraded in the next are said to undergo phase separation Signal sequences can target proteins assembled in the cytoplasm into the lumen of the endoplasmic reticulum
Which structure will form during the cytokinesis of a plant cell? septum cell plate cleavage furrow Which choice is an example of a product that is not a negative regulator protein. p21 RB1 p53 Cdk Which cell cycle checkpoint occurs during the mitotic phase of the cell cycle? M G2 G1 The mitotic phase of the cell cycle consists of cell growth DNA replication mitosis and cytokinesis The formation of a cleavage furrow only occurs during the cytokinesis of bacterial cells plant cells animal cells Single-celled eukaryotic organisms reproduce by the cell division process called reduction division mitosis meiosis binary fission In which stage of the cell cycle do cells that are not going to divide further are shunted into: S G1 G0 G2 Human sperm or egg cells contain one set of chromosomes which is a configuration known as __________ or ________. diploid, 2n diploid, n haploid, 2n haploid, n…
Which of the following is NOT a role of growth factors in the cell cycle? O Growth factors bind to a receptor and initiate a signal cascade within a cell O Their binding affects gene transcription O They act as repair proteins which fix DNA damage in the cell O They allow the cell to progress through the cell cycle
Which of the following statement is NOT true? Cell cycle cyclin dependent kinases (CDKs) are synthesized and degraded in every cell cycle O Activity of the S phase CDKs rise in the S phase and drops in the G2 and mitotic phase APC/C proteasome activity increases during mitotic phase and drops towards the end of the G1 phase G1/S cyclin protein amount rises in the G1 phase
In mammalian cells, different cyclin-CDK complexes regulate progression of cells through the cell cycle. Which of the following would be true during the cell cycle? Select all that apply Cyclin D phosphorylates and activates MCM protein, a helicase Cyclin B phosphorylates and breaks down the nuclear lamina OThe anaphase promoting complex, or APC/C is phosphorylated and activated by cyclin B Cyclin D helps promotes passage through the restriction point
The cell cycle contains a series of events that control the division of cells. It is controlled by which of the following: P. dephosphorylation of cyclin-dependent kinases (S) Q. binding of CDK inhibitor proteins (R) R. cyclin synthesis and degradation (P) S. phosphorylation of cyclin-dependent kinases (Q) R and S P, Q, R, and S Q and R P and Q
Which of the following is NOT a checkpoint that controls the progression of cell cycle? The metaphase checkpoint determines if all chromosomes are attached to the spindle apparatus Cytokinesis involves the formation of cleavage furrow to separate the cells The G2 checkpoint checks for DNA damage and determines if all of the DNA is replicated Cyclins and cyclin dependent kinases are protejns that are responsible for advancing a cell through the phases of the cell cycle
Which of the following statements correctly describes how cells progress through the various stages of the cell cycle? Controlled expression and degradation of both cyclins and cdks Controlled expression and degradation of only cyclins Fixed time frame for each phase of the cell cycle independent of protein expression O Controlled expression and degradation of only cdks
which of the following represents the amount of DNA in a typical human somatic Cell at the G2 stage of the cell cycle?n= number of chromosomes n 2n 4n 8n
The cell cycle is regulated by O Internal signals External signals Internal and external signals O Apoptosis
When considering the stages of the cell cycle, which stage is best associated with cells that do not divide, such as nerve cells? G1 phase M phase O None - all cells divide S phase G2 phase GO phase Pickles are often preserved in a 20-30% salt solution called brine. How does brine prevent contamination by microorganisms? Bacteria can't survive in hypotonic solutions because of the added pressure of the water they take in causing them to burst. O Bacteria can't survive in a hypertonic solution because they lose too much water and die. O The high salt concentration increases the pH of the environment, making it unfavorable for bacteria to live there. The high salt concentration creates an isotonic environment that the bacteria cannot live in. Bacteria cells are unable to digest the salt, thus killing the cells by starvation.
Some drugs can prevent the formation of new lysosomes. However, a cell would continue to make hydrolytic enzymes from the DNA still contained in the cell. Where would you most likely find these enzymes after the drug treatment? O Golgi Complex O Smooth Endoplasmic Reticulum O Nucleus O Mitochondrion Strikingly different signaling systems can operate in similar ways. For example, ethylene gas released by ripening fruits diffuses through the air from plant to