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Ch. 3 The Cell
Chapter 3, Problem 3.19a

Mark the following statements about the cell cycle as true or false. If a statement is false, correct it to make a true statement.


a. During the S phase of the cell cycle, the cell stalls until conditions for division are more favorable

Verified step by step guidance
1
Identify the phases of the cell cycle: G1, S, G2, and M.
Understand the role of the S phase: DNA replication occurs during this phase.
Evaluate the statement: 'During the S phase, the cell stalls until conditions for division are more favorable.'
Recognize that the S phase is primarily for DNA synthesis, not for stalling or checking conditions.
Correct the statement: During the S phase of the cell cycle, DNA replication occurs, preparing the cell for division.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Cell Cycle Stages

The cell cycle consists of several stages: G1 (gap 1), S (synthesis), G2 (gap 2), and M (mitosis). Each stage has specific functions, with the S phase being crucial for DNA replication, where the cell synthesizes a complete copy of its DNA in preparation for cell division.
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Cell Cycle Regulation

S Phase Function

The S phase is characterized by the replication of the cell's DNA, ensuring that each daughter cell receives an identical set of chromosomes. It is a highly regulated process, and the cell does not 'stall' but actively synthesizes DNA, making the statement in question false.
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Phases of Mitosis

Cell Cycle Regulation

The cell cycle is tightly regulated by various checkpoints and proteins, such as cyclins and cyclin-dependent kinases (CDKs). These regulatory mechanisms ensure that the cell only progresses to the next phase when conditions are favorable, preventing errors in DNA replication and division.
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Cell Cycle Regulation
Related Practice
Textbook Question

Number the following steps of protein synthesis in the order in which they occur, starting with 1 and ending with 9.


a._____The stop codon is reached, and the polypeptide is released.          

b. _____The small ribosomal subunit finds the start codon, and the large ribosomal subunit joins.          

c. _____The end of the gene is reached, and the pre-mRNA is released and then edited.          

d. _____The transcription factor binds the promoter.          

e. _____The protein is folded and modified to become functional.          

f. _____ RNA polymerase builds the mRNA transcript.          

g. _____mRNA and initiator tRNA bind the small ribosomal subunit.          

h. _____ New tRNAs are brought into the A site successively, and the peptide chain of the tRNA in the P site is joined to the amino acid of the tRNA in the A site.

i. ______mRNA exits the nucleus via a nuclear pore.

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Textbook Question

Which of the following is not a phase of mitosis?


a. Interphase

b. Prophase

c. Anaphase

d. Metaphase

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Textbook Question

Why is regulation of the cell cycle necessary?

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Textbook Question

Mark the following statements about the cell cycle as true or false. If a statement is false, correct it to make a true statement.


b. During metaphase, the sister chromatids are pulled apart and the chromosomes move to the opposite poles of the cell.

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Textbook Question

Mark the following statements about the cell cycle as true or false. If a statement is false, correct it to make a true statement.


c. The main enzyme that builds the new DNA strands during DNA synthesis is RNA synthetase.

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Textbook Question

Mark the following statements about the cell cycle as true or false. If a statement is false, correct it to make a true statement.


d. The first three stages of the cell cycle are collectively called interphase.

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