BIOL1406 Week 10 Exercise

Which of the following is part of the cell duplication machinery found in animals, but not in plants?

cell plate

centrosome

microtubular organizing center

lysosomes

centrosome

What are the three cell cycle checkpoints? [Select all that apply].

S

G2

Prophase onset

G0

M

G1

G1

M

G2

Human somatic cells normally have 46 chromosomes. How many chromosomes does a cell in anapahse (following splitting of centromeres and prior to cytokinesis) have?

92

46

23

96

92

The process of chromosome distribution between two daughter cells is known as:

mitosis

cell cycle

M phase

cytokinesis

mitosis

In plant cells, cytokinesis takes place by formation of a ____________, whereas in animal cells, the ______________ is responsible for cytokinesis?

cell plate; cleavage furrow

centrosomes; mitotic spindle

cleavage furrow; cell plate

mitotic spindle; centrosomes

cell plate; cleavage furrow

During the M phase, the division of cell cytoplasm is also known as:

cytokinesis

cytolysis

karyokinesis

mitosis

cytokinesis

What is the function of the kinetochore microtubules in mitosis?

They are involved in coiling and condensation of chromosomes.

separation of chromosomes.

cytokinesis

They are involved in the G2 checkpoint.

separation of chromosomes.

Mitosis occurs in:

prokaryotes

eukaryotes

both prokryotes and eukaryotes

eukaryotes

Under the compound light microscope, which of the following structures is visible in the mitotic cell, but is not visible in interphase.

nucleolus

nuclear membrane

chromosomes

lysosomes

chromosomes

Gene duplication, or DNA replication tekas place during:

prophase of mitosis

G2 of interphase in preparation of rmitosis

S phase

metaphase, immediately prior to separation of identical chromosomes

S phase

The fusion of two games is known as:

embryogenesis

differentiation

fertlization

gametogenesis

fertlization

a haploid cell that participates in the fertilization process (check all that apply):

germ cell

sperm

zygote

egg

somatic cell

gamete

egg

gamete

sperm

Members of a homologous pair of chromosomes:

separate to opposite sides of the cell during mitosis.

are only found in haploid cells.

are identical in size and appearance.

contain identical genetic information.

are identical in size and appearance.

At the end of the first meiotic division, each chromosome consists of:

a pair of homologues

four copies of each DNA molecule

chiasmata

two sister chromatids

two sister chromatids

Secondary spermatocytes form from:

the process of Meiosis II.

the process of Meiosis I.

repeated mitosis

when an individual is born.

the process of Meiosis II.

In a given organism, how do cells at the completion of meiosis compare with cells that are just about to begin meiosis?

Cells that have completed meiosis have the same number of chromsomes and half the amount of DNA compared with those just beginning meiosis.

Cells just beginning meiosis have half the amount of cytoplasm and twice the amount of DNA as those that have completed meiosis.

Cells that have completed meiosis have half the number of chromosomes and 1/4 the amount of DNA as those just beginning meiosis.

Cells that have completed meiosis have half the number of chromosomes and half the amount of DNA compared with cells just beginning meiosis.

Cells that have completed meiosis have half the number of chromosomes and 1/4 the amount of DNA as those just beginning meiosis.

Homologous chromosomes synapse and crossing over occurs.

This statement is true for both mitosis and meiosis I.

This statement is true for mitosis only.

This statement is true for meiosis I only.

This statement is true for mieosis II only.

This statement is true for mitosis and meiosis II.

This statement is true for meiosis I only.

A cell divides to form two cells that are genetically identical to the parent cell.

This statement is true for meiosis I only.

This statement is true for mitosis only.

This statement is true for mitosis and meiosis I.

This statement is true for mitosis and meiosis II.

This statement is true for Meiosis II only.

This statement is true for mitosis only.

Centromeres uncouple and chromatids separate from each other.

This statement is true for meiosis I only.

This statement is true for mitosis only.

This statement is true for mitosis and meiosis I.

This statement is true for mitosis and meiosis II.

This statement is true for meiosis II only.

This statement is true for mitosis and meiosis II.

Independent assortment of homologous chromosomes takes place.

This statement is true for meiosis II only.

This statement is true for mitosis and meiosis II.

This statement is true for meiosis I only

This statement is true for mitosis and meiosis I.

This statement is true for mitosis only.

This statement is true for meiosis I only

Genetic recombination in the form of crossover takes place.

This statement is true for mitosis only.

This statement is true for mitosis and meiosis II

This statement is true for meiosis I only.

This statement is true for meiosis II only.

This statement is true for mitosis and meiosis I.

This statement is true for meiosis I only.

For which of the following processes is there an unequal distribution of cytoplasm?

meiosis in males

meiosis in females

mitosis

meiosis I in both males and females

meiosis in females

In which stage of meiosis does crossover take place?

anaphase II

telophase II

prophase I

prophase II

metaphase I

metaphase II

anaphase I

telophase I

prophase I

A pair of chromosomes that contain information for the same features, but may carry different versions of that information are:

synaptonemal complex

homologous chromosomes

chromatin

nucleosomes

homologous chromosomes