What shape do strands of DNA take in a eukaryotic cell before they are packed?
a. Circular
b. Linear
c. Folded
d. Spiral
b. Linear
DNA strands in a eukaryotic cell are linear before they are packed.
Biology & Microbiology
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The brain is surrounded by a set of membranes called the
(a) pleural membranes. (b) peritoneum. (c) pericardial membranes. (d) meninges.
Biology & Microbiology
Which muscles contract during a restful expiration?
(a) external intercostals. (b) diaphragm. (c) abdominal. (d) both b and c.
Biology & Microbiology
Organisms at the first trophic level _____
a. capture energy from a nonliving source b. are eaten by organisms at higher trophic levels c. are shown at the bottom of an energy pyramid d. all of these
Biology & Microbiology
Which enzyme catalyzes the reaction: O2- + O2- + 2H+ ? H2O2 + O2?
A) catalase B) oxidase C) peroxidase D) superoxide dismutase
Biology & Microbiology