BIO 1400 EXAM 3 PRACTICE 2025/2026 LATEST STUDY QUESTIONS
WITH CORRECT ANSWERS GUARANTEED PASS | RATED A+
1. If an axon cannot perform saltatory conduction, then what is probably true of this axon ?
A. It has fewer voltage-gated Na+ channels than an axon that can perform saltatory conduction
B. It lacks an effective myelin sheath
C. It is associated with either Schwann cells or oligodendrocytes
D. It has multiple nodes of Ranvier
E. It generates fewer action potentials, and requires less ATP, than an axon of equal length that
can perform saltatory conduction - Answer>>> B. It lacks an effective myelin sheath
2. Which of the following is not a major clade of bilaterian animals ?
a) Deuterostomia
b) Lophotrochozoa
c) Ecdysozoa
d) Eumetazoa - Answer>>> d) Eumetazoa
3. Which of the following statements regarding the nervous system's transmission of signals is
false?
a) Information is conveyed by the particular pathway the signal takes
b) Communication usually involves more than one type of signal
c) The effects can be long lasting
d) Transmission is extremely fast for directing rapid responses to the environment
e) Impulses can act on neurons, muscle cells, and cells or glands that produce secretions -
Answer>>> c) The effects can be long lasting
, 4. Which of the following traits is shared by all vertebrates, at least in some developmental
stages, except the lampreys ?
a) notochord
b) vertebrae
c) cartilaginous skeleton
d) cranium (head)
e) mouth and jaws - Answer>>> e) mouth and jaws
5. Which is the correct of bodily responses to increased temperature ?
1. Thermostat in hypothalamus activates cooling mechanisms
2. Body temperature decreases
3. Body temperature increases
4. Sweet glands secrete sweat and blood vessels in skin dilate
A. 3,1,4,2
B. 1,2,3,4
C. 3,4,1,2
D. 4,3,2,1 - Answer>>> a) 3,1,4,2
6. Which of the following phyla have a water vascular system ?
a) molluscs
b) echinoderms
c) cnidarians
d) annelids
e) arthropods - Answer>>> b) echinoderms
7. All of the following are threats faced by freshwater and terrestrial molluscs except
WITH CORRECT ANSWERS GUARANTEED PASS | RATED A+
1. If an axon cannot perform saltatory conduction, then what is probably true of this axon ?
A. It has fewer voltage-gated Na+ channels than an axon that can perform saltatory conduction
B. It lacks an effective myelin sheath
C. It is associated with either Schwann cells or oligodendrocytes
D. It has multiple nodes of Ranvier
E. It generates fewer action potentials, and requires less ATP, than an axon of equal length that
can perform saltatory conduction - Answer>>> B. It lacks an effective myelin sheath
2. Which of the following is not a major clade of bilaterian animals ?
a) Deuterostomia
b) Lophotrochozoa
c) Ecdysozoa
d) Eumetazoa - Answer>>> d) Eumetazoa
3. Which of the following statements regarding the nervous system's transmission of signals is
false?
a) Information is conveyed by the particular pathway the signal takes
b) Communication usually involves more than one type of signal
c) The effects can be long lasting
d) Transmission is extremely fast for directing rapid responses to the environment
e) Impulses can act on neurons, muscle cells, and cells or glands that produce secretions -
Answer>>> c) The effects can be long lasting
, 4. Which of the following traits is shared by all vertebrates, at least in some developmental
stages, except the lampreys ?
a) notochord
b) vertebrae
c) cartilaginous skeleton
d) cranium (head)
e) mouth and jaws - Answer>>> e) mouth and jaws
5. Which is the correct of bodily responses to increased temperature ?
1. Thermostat in hypothalamus activates cooling mechanisms
2. Body temperature decreases
3. Body temperature increases
4. Sweet glands secrete sweat and blood vessels in skin dilate
A. 3,1,4,2
B. 1,2,3,4
C. 3,4,1,2
D. 4,3,2,1 - Answer>>> a) 3,1,4,2
6. Which of the following phyla have a water vascular system ?
a) molluscs
b) echinoderms
c) cnidarians
d) annelids
e) arthropods - Answer>>> b) echinoderms
7. All of the following are threats faced by freshwater and terrestrial molluscs except
