BIO 109 BLEDSOE QUESTIONS
AND CORRECT ANSWERS <
RECENT VERSION 2025/2026 >
SURE TO PASS!!
1. Cephalization is generally not associated with
a brain
bilateral symmetry
a longitudinal nerve cord
concentration of sensory structures at the anterior end of
an organism
a sessile existence - ANSWER ✓ a sessile existence
2. Which of the following statements comparing water-
soluble and lipid-soluble hormones is False?
Lipid-soluble hormones require the aid of a transport
protein to reach their target tissue.
Only lipid-soluble hormones bind to a receptor protein to
initiate their response.
, Both types of hormones can be transported in the blood
stream to their target sites.
Both water-soluble and lipid-soluble hormones can alter
the transcription of specific genes.
The receptors for water-soluble hormones are located on
the cell surface (plasma membrane). - ANSWER ✓ Only
lipid-soluble hormones bind to a receptor protein to
initiate their response
3. Asexual reproduction results in greater reproductive
success than does sexual reproduction when _____.
pathogens are rapidly diversifying
there is some potential for rapid overpopulation
species are expanding into diverse geographic settings
species are in stable and favorable environments
all of the above favor sexually reproducing species -
ANSWER ✓ species are in stable and favorable
environments
4. Increasing the temperature of the human scrotum by
2°C (that is, near the normal body core temperature) and
holding it there would most likely_____.
,reduce the fertility of the man by impairing the production
of gonadal steroid hormones
reduce the fertility of the man by impairing
spermatogenesis
reduce the man's sexual interest
increase the fertility of the affected man by enhancing the
rate of steroidogenesis
increase the fertility of the affected man by enhancing the
rate of spermatogenesis - ANSWER ✓ reduce the fertility
of the man by impairing spermatogenesis
5. Because the hormone ecdysone causes both molting
and metamorphosis in the caterpillar to a butterfly, what
determines when metamorphosis takes place?
A. rising levels of ecdysone
B. decreasing levels of ecdysone
C. high levels of juvenile hormone (JH)
D. low JH levels
E. both A and C - ANSWER ✓ D. low JH levels
, 6. A disease that destroys the adrenal cortex should lead
to an increase in the plasma levels of _____.
glucocorticoid hormones
epinephrine
adrenocorticotropic hormone (ACTH)
acetylcholine
estradiol - ANSWER ✓ adrenocorticotropic hormone
(ACTH)
7. All of the following are involved in hormonal control
of the male reproductive system except: - ANSWER ✓
progesterone
8. Which of the following statements comparing
spermatogenesis and oogenesis is (are) TRUE?
A. Only in oogenesis do all four products of meiosis
develop into mature gametes.
B. Oogenesis can produce mature eggs in a continuous
sequence, whereas spermatogenesis has long
interruptions.
C. Spermatogenesis, including the mitotic divisions of
stem cells, occurs throughout adolescence and adulthood.
AND CORRECT ANSWERS <
RECENT VERSION 2025/2026 >
SURE TO PASS!!
1. Cephalization is generally not associated with
a brain
bilateral symmetry
a longitudinal nerve cord
concentration of sensory structures at the anterior end of
an organism
a sessile existence - ANSWER ✓ a sessile existence
2. Which of the following statements comparing water-
soluble and lipid-soluble hormones is False?
Lipid-soluble hormones require the aid of a transport
protein to reach their target tissue.
Only lipid-soluble hormones bind to a receptor protein to
initiate their response.
, Both types of hormones can be transported in the blood
stream to their target sites.
Both water-soluble and lipid-soluble hormones can alter
the transcription of specific genes.
The receptors for water-soluble hormones are located on
the cell surface (plasma membrane). - ANSWER ✓ Only
lipid-soluble hormones bind to a receptor protein to
initiate their response
3. Asexual reproduction results in greater reproductive
success than does sexual reproduction when _____.
pathogens are rapidly diversifying
there is some potential for rapid overpopulation
species are expanding into diverse geographic settings
species are in stable and favorable environments
all of the above favor sexually reproducing species -
ANSWER ✓ species are in stable and favorable
environments
4. Increasing the temperature of the human scrotum by
2°C (that is, near the normal body core temperature) and
holding it there would most likely_____.
,reduce the fertility of the man by impairing the production
of gonadal steroid hormones
reduce the fertility of the man by impairing
spermatogenesis
reduce the man's sexual interest
increase the fertility of the affected man by enhancing the
rate of steroidogenesis
increase the fertility of the affected man by enhancing the
rate of spermatogenesis - ANSWER ✓ reduce the fertility
of the man by impairing spermatogenesis
5. Because the hormone ecdysone causes both molting
and metamorphosis in the caterpillar to a butterfly, what
determines when metamorphosis takes place?
A. rising levels of ecdysone
B. decreasing levels of ecdysone
C. high levels of juvenile hormone (JH)
D. low JH levels
E. both A and C - ANSWER ✓ D. low JH levels
, 6. A disease that destroys the adrenal cortex should lead
to an increase in the plasma levels of _____.
glucocorticoid hormones
epinephrine
adrenocorticotropic hormone (ACTH)
acetylcholine
estradiol - ANSWER ✓ adrenocorticotropic hormone
(ACTH)
7. All of the following are involved in hormonal control
of the male reproductive system except: - ANSWER ✓
progesterone
8. Which of the following statements comparing
spermatogenesis and oogenesis is (are) TRUE?
A. Only in oogenesis do all four products of meiosis
develop into mature gametes.
B. Oogenesis can produce mature eggs in a continuous
sequence, whereas spermatogenesis has long
interruptions.
C. Spermatogenesis, including the mitotic divisions of
stem cells, occurs throughout adolescence and adulthood.
