Hesi A2/Biology/Practice Questions With Complete
Solutions
"Energy cannot be destroyed; it can only be
transformed" is a statement of what physical
law?
a. first law of thermodynamics
b. second law of thermodynamics
c. law of entropy
d. law of constant composition Correct Answer a. The first law
of thermodynamics describes
the conservation of energy.
2. Sarcoma: ο
A) Part of the backbone
112
B) Flesh tumor, benign
C) Malignant tumor of flesh tissue
D) Mass of blood
E) Skin tumor of epithelial cells Correct Answer C) Malignant
tumor of flesh tissue
A benign tumor usually caused by a papilloma -
virus is a
a. wart.
b. sarcoma.
c. adenoma.
d. cold sore. Correct Answer a. Warts are usually insignificant
growths
caused by a virus. Sarcomas are malignant
tumors arising from connective tissue, while
,adenomas are glandlike benign tumors. A
cold sore is a lesion caused by the herpes
simplex virus.
A cell division occurs in a human. The resulting cells contain 23
chromosomes. This is a description of gametes formed by which
process?
A. Mitosis
B. Binary fission
C. Meiosis
D. Cytokinesis Correct Answer C
A disc is:
ο
A) Part of the hip bone
B) A piece of cartilage between backbones
C) A piece of bony tissue connecting the joints in the back
D) An abnormal structure in the back
E) A pad of fatty tissue between backbones Correct Answer B)
A piece of cartilage between backbones
A father presents an X-linked trait and a
mother does not. What is the probability that
the mother is a carrier of this trait if they
produce a son who also presents the X-linked
trait?
a. 0%
,b. 25%
c. 50%
d. 100% Correct Answer d. The father gives only his Y
chromosome to
the son, so the mother must have given the
son the X-linked trait. Because the mother
does not show the X-linked trait, she is
considered a carrier of the trait.
A fossil is found that is believed to be at least
three billion years old. Which of the following
modern organisms would it most likely
resemble?
a. primitive aquatic plants
b. protists
c. bacteria
d. protozoa Correct Answer c. Early cells were prokaryotic and
resemble
the bacteria found today. The other options
are simple life forms that evolved from
single-celled prokaryotes.
A molecule of water is bonded with another molecule of water
by what type of bond?
A. Ionic
B. Covalent
C. Hydrogen
, D. Molecular Correct Answer C
A pea plant has alleles for the dominant tall gene (T) and the
recessive short gene (t). Therefore, it appears as Tt. Which of the
following will correctly describe its phenotype if there is
complete dominance? And which describes incomplete
dominance? (complete, incomplete)
Tall, Tall
B Average. Tall
C Tall, Average
D Tall, Short Correct Answer Tall, Average
Because the dominant allele is present, this pea plant will be tall
despite its recessive gene in complete dominance. In Incomplete
dominance however, the gene must be homozygous to show one
trait. Otherwise the phenotype will be a mixture of the two
alleles.
A scientist conducts an experiment to discover the effect of
music on plant growth. He hypothesizes that the music will help
plants grow at a faster rate than plants without music. By the end
of the experiment, plants grown with music playing grew to an
average height of 5.6 inches, while plants grown without music
playing grew to an average height of 2.3 inches. Which of the
following is the scientist's correct conclusion?
All plants grow better with music.
B In the experiment, plants grown with music grew better than
those grown without it.
Solutions
"Energy cannot be destroyed; it can only be
transformed" is a statement of what physical
law?
a. first law of thermodynamics
b. second law of thermodynamics
c. law of entropy
d. law of constant composition Correct Answer a. The first law
of thermodynamics describes
the conservation of energy.
2. Sarcoma: ο
A) Part of the backbone
112
B) Flesh tumor, benign
C) Malignant tumor of flesh tissue
D) Mass of blood
E) Skin tumor of epithelial cells Correct Answer C) Malignant
tumor of flesh tissue
A benign tumor usually caused by a papilloma -
virus is a
a. wart.
b. sarcoma.
c. adenoma.
d. cold sore. Correct Answer a. Warts are usually insignificant
growths
caused by a virus. Sarcomas are malignant
tumors arising from connective tissue, while
,adenomas are glandlike benign tumors. A
cold sore is a lesion caused by the herpes
simplex virus.
A cell division occurs in a human. The resulting cells contain 23
chromosomes. This is a description of gametes formed by which
process?
A. Mitosis
B. Binary fission
C. Meiosis
D. Cytokinesis Correct Answer C
A disc is:
ο
A) Part of the hip bone
B) A piece of cartilage between backbones
C) A piece of bony tissue connecting the joints in the back
D) An abnormal structure in the back
E) A pad of fatty tissue between backbones Correct Answer B)
A piece of cartilage between backbones
A father presents an X-linked trait and a
mother does not. What is the probability that
the mother is a carrier of this trait if they
produce a son who also presents the X-linked
trait?
a. 0%
,b. 25%
c. 50%
d. 100% Correct Answer d. The father gives only his Y
chromosome to
the son, so the mother must have given the
son the X-linked trait. Because the mother
does not show the X-linked trait, she is
considered a carrier of the trait.
A fossil is found that is believed to be at least
three billion years old. Which of the following
modern organisms would it most likely
resemble?
a. primitive aquatic plants
b. protists
c. bacteria
d. protozoa Correct Answer c. Early cells were prokaryotic and
resemble
the bacteria found today. The other options
are simple life forms that evolved from
single-celled prokaryotes.
A molecule of water is bonded with another molecule of water
by what type of bond?
A. Ionic
B. Covalent
C. Hydrogen
, D. Molecular Correct Answer C
A pea plant has alleles for the dominant tall gene (T) and the
recessive short gene (t). Therefore, it appears as Tt. Which of the
following will correctly describe its phenotype if there is
complete dominance? And which describes incomplete
dominance? (complete, incomplete)
Tall, Tall
B Average. Tall
C Tall, Average
D Tall, Short Correct Answer Tall, Average
Because the dominant allele is present, this pea plant will be tall
despite its recessive gene in complete dominance. In Incomplete
dominance however, the gene must be homozygous to show one
trait. Otherwise the phenotype will be a mixture of the two
alleles.
A scientist conducts an experiment to discover the effect of
music on plant growth. He hypothesizes that the music will help
plants grow at a faster rate than plants without music. By the end
of the experiment, plants grown with music playing grew to an
average height of 5.6 inches, while plants grown without music
playing grew to an average height of 2.3 inches. Which of the
following is the scientist's correct conclusion?
All plants grow better with music.
B In the experiment, plants grown with music grew better than
those grown without it.
