You have been studying a recently discovered organism and have observed that the cells have an obvious nucleus. Based on this observation, the organism must be a prokaryote
a. true
b. false
Answer: b. false
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When a sarcomere is at rest, the myosin binding sites
on actin are blocked by a. calcium. b. troponin. c. tropomyosin. d. the myosin heads. e. ADP.
The three small bones (malleus, incus, and stapes) that transmit vibrations across the middle ear are collectively called the ____
Fill in the blank(s) with correct word
Which of the following takes place on the longest temporal scale?
A) formation of new species after prolonged isolation of subpopulations B) selective replacement of genotypes within populations (evolution) C) interactions between populations (competitive exclusion) D) death and replacement of individuals in populations (demography and population regulation) E) individual movements (behavior)
In Escherichia coli, when the lac operon is fully induced (in the presence of lactose):
A. lactose cannot be cleaved to enter glycolysis. B. the lac repressor is active and transcription of the lac operon does not occur. C. lactose cannot be transported by the cells. D. the lac repressor is inactive and transcription of the lac operon does occur.