A nucleolus is
A) the area in a prokaryote where DNA is concentrated.
B) an extra nucleus in the cell.
C) an area in the nucleus of eukaryotic cells where ribosomes are synthesized and assembled.
D) a membrane-bound organelle.
E) an area where the nucleus is synthesized.
C
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Which pairing of nerves and functions is part of the peripheral nervous system?
a. somatic nerves; flight-fight response b. autonomic nerves; control skeletal muscle c. autonomic nerves; control internal organs d. parasympathetic neurons; prepare body for danger e. sympathetic neurons; housekeeping tasks in the body
Photosynthesis produces O2
1.True 2.False
Which feature of life is the ability to maintain a stable internal state?
a. energy production b. sensing the outside world c. reproduction d. homeostasis e. growth
The earliest multicellular animals in the fossil record are
A) sponges. B) mammals. C) kelp. D) worms. E) trilobites.