Most dinosaurs were extinct by ____ years ago
a. 10,000
b. 1 million
c. 500 million
d. 65 million
e. 1 billion
ANSWER: d
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Which of these is an incorrect comparison between flagella and cilia?
A. Flagella are longer structures than cilia. B. Flagella have essentially the same internal structure of cytoskeleton proteins as cilia. C. Flagella are used for propulsion, while cilia are used to attach cells to other cells or surfaces. D. Flagella and cilia are both used for types of cellular movement. E. Flagella are found in all three domains of organisms, while cilia are found only in Eukarya.
A motor neuron's and reside in the central nervous system, but its extend(s) into the peripheral nervous system.
A. cell body; dendrites; axon B. axon; cell body; trigger zone C. dendrites; axon; cell body D. axon; cell body; dendrites E. None of the answer choices is correct.
Ser Thr kinases take the gamma phosphate off of ATP and covalently link it to a hydroxyl group.
a. true b. false
When a muscle cell contracts, what type of work is being powered by ATP?
A) chemical B) transport C) mechanical D) potential