Chapter 8 Test Review Question Preview (ID: 36200)


Chapter 8 Test.

_______________ is the failure of chromosomes or chromatids to separate normally during meiosis.
a) nondisjunction
b) crossing over
c) random fertilization
d) deletion

The creation of genetically identical offspring by a single parent, without the participation of sperm and egg, is called
a) asexual reproduction
b) sexual reproduction
c) regeneration
d) meiosis

Asexual reproduction requires ________ individual(s).
a) 5
b) 1
c) 3
d) 2

Which of the following helps maintain the structure of chromosomes and control the activity of genes?
a) proteins
b) ribosomes
c) nuclear membrane
d) chromatids

Sister chromatids are
a) made only of DNA.
b) found right after a cell divides.
c) joined together at a centromere.
d) unique to prokaryotes.

Prior to mitosis, each chromosome of a eukaryotic cell consists of a pair of identical structures called
a) sister chromosomes.
b) chromatin.
c) nucleoli.
d) sister chromatids.

____________________ produces offspring that are similar to the parents, but show variations in traits and involves inheritance of unique sets of genes from two parents
a) asexual reproduction
b) sexual reproduction
c) regeneration
d) mitosis

During ____________ the cytoplasmic contents double and chromosomes duplicate in the nucleus .
a) Interphase
b) Prophase
c) Anaphase
d) Metaphase

In _______________ microtubules begin to emerge from centrosomes, forming the mitotic spindle.
a) Prophase
b) Interphase
c) Anaphase
d) Telophase

During ______________ phase chromosomes align at the cell equator.
a) Prophase
b) Metaphase
c) Anaphase
d) Interphase

In animal cells, cytokinesis occurs as a _________________ forms.
a) cleavage furrow
b) cell plate
c) nuclear envelope
d) nucleus

Cell division is controlled by ___________ in which crowded cells stop dividing.
a) Denisty-dependent inhibition
b) anchorage dependence
c) growth factors
d) density-independent inhibition

A benign tumor differs from a malignant tumor in that a benign tumor
a) is cancerous.
b) does not metastasize.
c) never causes health problems.
d) spreads from the original site.

Two chromosomes in a nucleus that carry genes controlling the same inherited characteristics are
a) heterologous chromosomes.
b) homologous chromosomes.
c) complementary chromosomes.
d) parallel chromosomes.

During which stage of meiosis do synapsis and crossing over occur?
a) prophase II
b) interphase I
c) metaphase I
d) prophase I

Karyotyping
a) examines points of crossing over.
b) can reveal alterations in chromosome number.
c) shows chromosomes as they appear in metaphase of meiosis II.
d) reveals the presence of cancerous genes.

The loss of a chromosome segment is called
a) a deletion.
b) an inversion.
c) translocation.
d) a duplication.

Which of the following statements regarding the differences between mitosis and meiosis is false?
a) In meiosis four daughter cells are produced, whereas in mitosis two daughter cells are produced.
b) Crossing over is a phenomenon that creates genetic diversity during mitosis.
c) In mitosis cytokinesis occurs once, whereas in meiosis cytokinesis occurs twice.
d) Cells produced by mitosis are diploid, whereas cells produced by meiosis are haploid.

Both mitosis and meiosis are preceded by
a) Interphase
b) Prophase
c) Telophase
d) Anaphase

As a patch of scraped skin heals, the cells fill in the injured area but do not grow beyond that. This is an example of
a) anchorage independence.
b) density-independent inhibition.
c) growth factor inhibition.
d) density-dependent inhibition.

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