Biological Science (7th Edition)
7th Edition
ISBN: 9780134678320
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Greg Podgorski, Emily Taylor, Jeff Carmichael
Publisher: PEARSON
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Textbook Question
Chapter 12, Problem 2TYK
After S phase, what comprises a single chromosome?
a. two daughter chromosomes
b. a double-stranded DNA molecule
c. two single-stranded DNA molecules
d. two sister chromatids
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Students have asked these similar questions
When homologous chromosomes cross over, what is the result?
a.
Two sister chromatids get tangled, resulting in one altering the sequence of its DNA
b.
Two sister chromatids exchange identical pieces of DNA
c.
Two nonsister chromatids get tangled, break and proteins re-join them
d.
Each of the four DNA strands of a homologous pair is broken, and the pieces are mixed
In mitosis, chromosomes separate by which specific mechanism?
A. chromosomes sprout flagella and begin to swim towards the ends of the cell
B. molecular motors in the kinetochore move the chromosome toward the centrioles
C. centrioles attract the chromosomes by electromagnetic attraction
D. centrioles begin to shorten microtubules by degrading them
The drug colchicine prevents the spindles microtubules from forming or growing. What would happen in mitosis to a cell that was given colchicine throughout mitosis?
A. The chromosomes would not condense
B. The nuclear envelope would not dissolve
C. The chromosomes would not line up for metaphase
D. The chromosomes would line up for metaphase but would not pull apart in anaphase.
Chapter 12 Solutions
Biological Science (7th Edition)
Ch. 12 - 1. Which statement about the daughter cells...Ch. 12 - After S phase, what comprises a single chromosome?...Ch. 12 - Progression through the cell cycle is regulated by...Ch. 12 - 4. What major events occur during anaphase of...Ch. 12 - 5. Identify at least two events in the cell cycle...Ch. 12 - 6. What evidence suggests that during anaphase,...Ch. 12 - 7. Evaluate each of the following defects. Which...Ch. 12 - Prob. 8TYUCh. 12 - Prob. 9TYPSSCh. 12 - Prob. 10TYPSS
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- Which statement about eukaryotic chromosomes entering mitosis is NOT true?a. They enter as two chromatids.b. They enter with a single centromere.c. They are soon visible under the light microscope.d. Their DNA is not yet replicated.arrow_forwardWhat is the role of cohesin proteins in cell division? a. They organize the DNA of the chromosomes into highly condensed structures. b. They hold the DNA of the sister chromatids together. c. They help the cell divide into two daughter cells. d. They connect microtubules and chromosomes.arrow_forwardWhat occurs during the anaphase stage of mitosis? a.Chromosomes arrive at opposite spindle poles and become enclosed by a new nuclear envelope. b.Chromosomes pack tightly and become attached to a newly forming spindle. c.Sister chromatids separate and move toward opposite spindle poles. d.All chromosomes are aligned midway between spindle poles.arrow_forward
- What happens during telophase? A. Chromosomes are visible, nuclear envelope disappears, spindle fibers become visible B. Sister chromatids are pulled apart, daughter cells begin to from C. Chromosomes line up in the middle, microtubules attach themselves to chromosomes D. Sister chromatids reach opposite ends of the cell, nucelar envelopes begin to formarrow_forwardWhat is the fundamental difference between mitosis and meiosis? A. DNA is replicated twice in meiosis, but only once in mitosis. B. The number of DNA molecules per cell nucleus is cut in half in meiosis but remains constant in mitosis. C. The number of chromosomes doubles in meiosis, whereas it stays the same in mitosis. D. Mitosis involves two cell divisions, whereas meiosis only involves one.arrow_forwardWhat is the function of the kinetochore during mitosis?a. It promotes the attachment of monads to each other toform a dyad.b. It is a location where a kinetochore microtubule can attachto a chromosome.c. It promotes the condensation of chromosomes duringprophase.d. Both a and b are correct.arrow_forward
- What is a critical event that occurs during S phase of the cell cycle?a. Cells decide whether or not to divide.b. DNA replication produces pairs of sister chromatids.c. The chromosomes condense.d. The single nucleus is divided into two nuclei.arrow_forwardWhich of these things happens in meiosis but Not mitosis? A. sister chromatids separate from each other B. diploid daughter cells are formed C. homologous chromosomes pair uparrow_forwardWhat structure is most important in forming the tetrads? a. centromere b. synaptonemal complex c. chiasma d. kinetochorearrow_forward
- Unpacking of chromosomes and the formation of a new nuclear envelope is a characteristic of which stage of mitosis? a. prometaphase b. metaphase c. anaphase d. telophasearrow_forwardWhat is a main difference between onion root tip (plant cell) mitosis and whitefish blastula (animal cell) mitosis? A. The DNA is animal cells is inside of a nucleus but there is no nucleus in plant cells. B. A cleavage furrow is not formed in plant cells due to the rigid cell wall. C. Plant cells do not have DNA and animal cells do. D. Plant cells have undergo prophase where they condense their chromosomes but animal cells skip this step.arrow_forwardAs a cell undergoes meiosis What happens during crossover? A. Sister chromatids and non sister chromatids physically swap places within the tetrad resulting in the mixture of entire chromatids B. Nonsister chromatids exchange parts of themselves resulting in mixing of genetic information between those chromatids C. Homologous chromosomes lineup along the equatorial play randomly mixing the maternal and paternal chromosomes along the way D.arrow_forward
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