Life: The Science of Biology

David E. Sadava, David M. Hilliss, H. Craig Heller,May Berenbaum

Chapter 11

The Cell Cycle and Cell Division - all with Video Answers

Educators

Chapter Questions

Problem 1

Which statement about eukaryotic chromosomes is not true?
a. They sometimes consist of two chromatids.
b. They sometimes consist only of a single chromatid.
c. They normally possess a single centromere.
d. They consist only of proteins.
$e .$ During metaphase they are visible under the light microscope.

Bryan Lynn

Bryan Lynn

Numerade Educator

Problem 2

Nucleosomes
a. are made of chromosomes.
$b .$ consist entirely of DNA.
c. consist of DNA wound around a histone core.
d. are present only during mitosis.
e. are present only during prophase.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 3

Which statement about the cell cycle is not true?
a. It consists of interphase, mitosis, and cytokinesis.
b. The cell's DNA replicates during G1.
c. A cell can remain in G1 for weeks or much longer.
$d$. DNA is not replicated during $G 2$
e. Cells enter the cell cycle as a result of internal or external signals.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 4

Which statement about mitosis is not true?
a. A single nucleus gives rise to two identical daughter nuclei.
b. The daughter nuclei are genetically identical to the parent nucleus.
c. The centromeres separate at the onset of anaphase.
d. Homologous chromosomes synapse in prophase.
$e$ The centrosomes organize the microtubules of the spindle fibers.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 5

Which statement about cytokinesis is true?
$a .$ In animals, a cell plate forms.
$b,$ In plants, it is initiated by furrowing of the membrane.
c. It follows mitosis.
d. In plant cells, actin and myosin play an important part.
¿It is the division of the nucleus.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 6

Apoptosis
a. occurs in all cells.
$b$. involves the formation of the plasma membrane.
c. does not occur in an embryo.
$d$ is a series of programmed events resulting in cell death.
$e$ is the same as necrosis.

Tate Hilken

Numerade Educator

Problem 7

In meiosis,
a. meiosis II reduces the chromosome number from diploid to haploid.
b. DNA replicates between meiosis I and meiosis II.
$c$ the chromatids that make up a chromosome in meiosis II are identical.
$d$. each chromosome in prophase I consists of four chromatids.
e. homologous chromosomes separate from one another in anaphase I.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 8

In meiosis,
$a$ a single nucleus gives rise to two daughter nuclei.
b. the daughter nuclei are genetically identical to the parent nucleus.
c. the centromeres separate at the onset of anaphase I.
d. homologous chromosomes synapse in prophase I.
$e .$ no spindle forms.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 9

An animal has a diploid chromosome number of $12 .$ An egg cell of that animal has 5 chromosomes. The most probable explanation is
$a$ normal mitosis.
b. normal meiosis.
$c$ nondisjunction in meiosis 1
$d$. nondisjunction in meiosis I or II.
$e .$ nondisjunction in mitosis.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 10

The number of daughter chromosomes in a human cell (diploid number 46 ) in anaphase II of meiosis is
$a \cdot 2$
b. 23
$c .46$
d. $69 .$
$e .92$

Jennifer Hudspeth

Jennifer Hudspeth

Numerade Educator