Which organelle has only a single membrane around it?
A) ribosome
B) nucleus
C) mitochondrion
D) chloroplast
E) peroxisome
E) peroxisome
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In a sandy beach community, ghost crabs and beach flies occur within
A) the supratidal zone. B) the intertidal zone. C) the subtidal zone. D) any tidal zone.
Over time, how do skeletal muscle cells respond to regular weight-lifting exercise?
A) They get larger, making the overall muscle bigger. B) They multiply, making the overall muscle bigger. C) They are able to contract for longer periods of time. D) They contain more actin and less myosin.
The theory that earthquakes, floods, and other natural disasters cause extinctions of some species while leaving others unharmed is ________
Fill in the blank(s) with correct word
What is meant by the statement "Enzymes are biological catalysts"?
a. Enzymes speed up the chemical reactions in living cells. b. Enzymes are products of biological systems. c. Enzymes produce biological organisms. d. Enzymes produce products useful for biology.