,BIOD 210 Module 3 Exam | Q&A | 2026/2027 | Genetics | Portage
Learning
1. DNA is condensed within the nucleus by coiling around which proteins?
A) Enzymes
B) Histone proteins
C) Ribosomal proteins
D) Transport proteins
Correct Answer: Histone proteins
Rationale: DNA is condensed within the nucleus by coiling around histone
proteins. These positively charged proteins interact with negatively charged
DNA to package it into chromatin and chromosomes.
2. Modification of histone proteins to become neutral or negatively charged
results in:
A) Tighter DNA coiling
B) Loosening of DNA-histone interactions
C) Increased DNA replication
D) Decreased gene expression
Correct Answer: Loosening of DNA-histone interactions
Rationale: Modification of positively charged histones alters them to become
either neutral or negatively charged. Thus the interaction with negatively
charged DNA is interrupted, and the interactions loosen.
3. Threadlike structures made of DNA molecules that contain the genes are
called:
,A) Chromatin
B) Histones
C) Chromosomes
D) Nucleosomes
Correct Answer: Chromosomes
Rationale: Chromosomes are threadlike structures made of DNA molecules
that contain the genes. During cell division, chromatin condenses to form
these visible structures.
4. Which of the following is NOT one of the four characteristics that genetic
flow of material between organisms depends on?
A) Replication of the material
B) Storage of the information
C) Independent assortment of the genes
D) Expression of the information
Correct Answer: Independent assortment of the genes
Rationale: The genetic flow of material between organisms depends on: 1)
replication of the material, 2) storage of the information, 3) expression of the
information, and 4) variation through mutations. Independent assortment is
a Mendelian principle, not a characteristic of genetic flow.
5. The process in which one strain of bacteria is changed by a gene or genes
from another strain of bacteria is called:
A) Conjugation
B) Transduction
, C) Transformation
D) Transcription
Correct Answer: Transformation
Rationale: Transformation is the process in which one strain of bacteria is
changed by a gene or genes from another strain of bacteria. This was
demonstrated by Avery, MacLeod, and McCarty.
6. Variation through mutations is important for genetic flow because it:
A) Prevents genetic changes
B) Provides the raw material for evolution
C) Ensures identical offspring
D) Stops DNA replication
Correct Answer: Provides the raw material for evolution
Rationale: Variation through mutations is one of the four characteristics that
genetic flow depends on. Mutations provide the genetic variation necessary
for evolution and adaptation.
7. True or False: The two classes of proteins that monitor the progression of
the cell cycle are cyclins and cyclin-dependent kinases (CDKs).
A) True
B) False
Correct Answer: True
Learning
1. DNA is condensed within the nucleus by coiling around which proteins?
A) Enzymes
B) Histone proteins
C) Ribosomal proteins
D) Transport proteins
Correct Answer: Histone proteins
Rationale: DNA is condensed within the nucleus by coiling around histone
proteins. These positively charged proteins interact with negatively charged
DNA to package it into chromatin and chromosomes.
2. Modification of histone proteins to become neutral or negatively charged
results in:
A) Tighter DNA coiling
B) Loosening of DNA-histone interactions
C) Increased DNA replication
D) Decreased gene expression
Correct Answer: Loosening of DNA-histone interactions
Rationale: Modification of positively charged histones alters them to become
either neutral or negatively charged. Thus the interaction with negatively
charged DNA is interrupted, and the interactions loosen.
3. Threadlike structures made of DNA molecules that contain the genes are
called:
,A) Chromatin
B) Histones
C) Chromosomes
D) Nucleosomes
Correct Answer: Chromosomes
Rationale: Chromosomes are threadlike structures made of DNA molecules
that contain the genes. During cell division, chromatin condenses to form
these visible structures.
4. Which of the following is NOT one of the four characteristics that genetic
flow of material between organisms depends on?
A) Replication of the material
B) Storage of the information
C) Independent assortment of the genes
D) Expression of the information
Correct Answer: Independent assortment of the genes
Rationale: The genetic flow of material between organisms depends on: 1)
replication of the material, 2) storage of the information, 3) expression of the
information, and 4) variation through mutations. Independent assortment is
a Mendelian principle, not a characteristic of genetic flow.
5. The process in which one strain of bacteria is changed by a gene or genes
from another strain of bacteria is called:
A) Conjugation
B) Transduction
, C) Transformation
D) Transcription
Correct Answer: Transformation
Rationale: Transformation is the process in which one strain of bacteria is
changed by a gene or genes from another strain of bacteria. This was
demonstrated by Avery, MacLeod, and McCarty.
6. Variation through mutations is important for genetic flow because it:
A) Prevents genetic changes
B) Provides the raw material for evolution
C) Ensures identical offspring
D) Stops DNA replication
Correct Answer: Provides the raw material for evolution
Rationale: Variation through mutations is one of the four characteristics that
genetic flow depends on. Mutations provide the genetic variation necessary
for evolution and adaptation.
7. True or False: The two classes of proteins that monitor the progression of
the cell cycle are cyclins and cyclin-dependent kinases (CDKs).
A) True
B) False
Correct Answer: True
