The cytoplasmic space in eukaryotic cells is occupied by many diverse membrane-bound structures with specific cellular functions called:
A. organelles.
B. flagella.
C. cilia.
D. receptors.
E. chromosomes.
Answer: A
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Which part of the neuron conducts the electrical signals away from the cell body of a neuron?
a. axon terminal b. axon c. axon hillock d. nucleus e. dendrites
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At rest, neurons exhibit a negative membrane potential. Among the factors that maintain this polarity, assess which is most DIRECTLY responsible for the difference between intracellular and extracellular ion concentrations?
A. passive leakage of K+ ions across the membrane. B. movement of K+ ions through voltage-gated K+ channels. C. passive leakage of Na+ ions across the membrane. D. movement of Na+ ions through voltage-gated Na+ channels. E. movements of negatively charged proteins and nucleic acids across the membrane.
Which of the following is not how botulism is contracted?
A) adults eating canned vegetables such as beets, carrots, or spinach B) IV drug users who use needles contaminated with C. botulinum endospores C) Infants encounter C. botulinum endospores by eating honey. D) Infants encounter C. botulinum endospores through wind and dust. E) Elderly farmers encounter C. botulinum endospores through wind and dust.