Vesicles in the axon terminal contain ________
A) neurotransmitters B) Ca2+
C) digestive enzymes D) chromatophilic substance
Answer: A
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In insects, sperm are able to fertilize the shelled egg through a tunnel called the __________
Fill in the blank with the correct word.
The mass number represents the number of
A) protons in an atom. B) electrons in an ion. C) neutrons in an atom. D) protons and neutrons in an atom. E) neutrons and electrons in an atom.
An inhibitory local potential causes which of the following?
A. Hyperpolarization of the plasma membrane B. Depolarization of the plasma membrane C. Drifting of the membrane potential towards the resting membrane potential D. Neutralization of the plasma membrane E. Repolarization of the plasma membrane
Internal structures of a cell that carry out specialized metabolic tasks are called _____
A. cytoskeletal elements B. enzymes C. ribosomes D. organelles