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General Biology I (Bio 111)Exam 3 Questions and Answers.
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General Biology I (Bio 111)Exam 3
Example Exam Questions
A diploid organism that has two identical alleles for the same trait is described as
_______ for that particular trait.
a. homozygous
b. heterozygous
c. dominant
d. recessive
e. codominant
The observable outward manifestation of the genes of an individual is referred to as its
a. karyotype.
b. genotype.
c. phenotype.
d. genetic map.
What is the name of the cross that involves the mating of a hybrid F1 plant with a
homozygous recessive plant for the same trait?
a. monohybrid cross
b. dihybrid cross
c. reciprocal cross
d. test cross
e. left cross
Sometimes one gene pair will interact so as to control the expression of a second gene
pair in an interaction called
a. dominance.
b. gene regulation.
c. recessiveness.
d. pleiotropy.
e. epistasis.
When Mendel crossed dark purple-flowered pea plants with white-flowered pea plants,
he never got any pea plants with light purple flowers. This was counter to the
a. idea of acquired characteristic inheritance.
b. theory of blending inheritance.
c. the assumption of direct transmission of traits.
d. the law of dominance.
e. the laws of probability.
,Height and eye colors are two examples of continuous variation in humans. Whereas in
pea plants the tall allele is dominant over the short allele, there are no intermediate
heights in peas. Which of the following is the best explanation for the differences
described above?
a. Humans are more advanced than pea plants; thus, the genetics of peas is
much simpler than humans.
b. The intermediate size pea plant seeds are aborted within the seedpod and
thus will never develop.
c. The intermediate size pea plant seeds have deleterious alleles that prevent
them from germinating.
d. Many genes, rather than one gene for a characteristic, control some
variations in species.
e. These variations in humans are affected by lack of dominance in the alleles
that control these traits.
Organisms generally have many more genes that assort independently than the
number of chromosomes. This phenomenon is due to
a. independent assortment.
b. segregation.
c. crossing over.
d. epistasis.
e. pleiotropy.
Occasionally, chromosomes fail to separate during meiosis, leading to a condition in
which the diploid number is not normal. This phenomenon is called
a. epistasis.
b. nondisjunction.
c. disjunction.
d. pleiotropy.
e. autosomy.
How many Barr bodies does a normal human female contain in her cells?
a. 0
b. 1
c. 2
d. 3
e. 4
If a female is a carrier for sex-linked, recessive color blindness, what would the
expected percentage of her male children that could be color blind?
a. 0%
b. 25%
c. 50%
d. 100%
, The method of DNA replication, where each original strand is used as a template to
build a new strand, is called the
a. conservative method.
b. semiconservative method.
c. disruptive method.
d. continuous method.
e. replication and amplification method.
The chemical bonds that stabilize the complimentary nitrogen bases into a double helix are
a. nitrogen bonds.
b. hydrogen bonds.
c. hydrophobic bonds.
d. peptide bonds.
e. phosphodiester bonds.
DNA polymerase requires a(n) __________ to initiate synthesis.
a. amino acid primer.
b. lipid primer.
c. hydrophobic primer.
d. DNA primer.
e. RNA primer.
1The lagging strand is replicated with stretches of Okazaki fragments and that is why its
synthesis is considered to be
a. discontinuous.
b. continuous.
c. primed.
d. never stopping.
e. semi-conservative.
In 1952, Hershey and Chase confirmed Avery's (1944) results that
a. proteins were the repositories for hereditary information.
b. DNA was the repository for hereditary information.
c. RNA was the repository for hereditary information.
d. proteins and DNA were the repositories for hereditary information.
e. transformation in bacterial cells induced changes in the host's somatic cells.
The site of the opening of the DNA strands where active replication occurs is referred to
as the
a. replication fork.
b. replisome.
c. primosome.
d. sliding clamp subunit.
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