Question
What feature of both striated muscle and aseptate fungal hyphae is different from typical cell structure?
A. They have multiple nuclei within a structural unit.
B. They have a cell wall that is not made of cellulose.
C. They have plasmids.
D. They have an absence of cholesterol in the plasma membrane.
▶️Answer/Explanation
Ans: A
Question
Common pesticides used by gardeners contain neonicotinoids.
What is the effect of a neonicotinoid pesticide on the transmission of a nerve impulse between neurons in an insect?
It prevents the release of acetylcholine from the presynaptic membrane.
It widens the synaptic cleft so diffusion of acetylcholine across the gap is slower.
It irreversibly binds with acetylcholine receptors on the postsynaptic membrane.
It interferes with the enzymatic breakdown of acetylcholine by acetylcholinesterase.
▶️Answer/Explanation
Ans: C
Question
How does potassium move across the membrane of a neuron during repolarization?
Simple diffusion
Facilitated diffusion
Endocytosis
Active transport
▶️Answer/Explanation
Ans: B
Question
Which organelle provides evidence that eukaryotic cells originated when large prokaryotes
engulfed small free-living prokaryotes?
Chloroplast
Nucleoid
80S ribosome
Vacuole
▶️Answer/Explanation
Ans: A
Question
The concentrations of cyclins rise and fall in cells at certain times.
What times are these?
Day and night
Seasons of the year
Stages of mitosis and interphase
Developmental stages in the life cycle
▶️Answer/Explanation
Ans: C