Which is not true of the cytoplasmic membrane?
A. It defines the boundaries of the cell.
B. It is a semipermeable barrier.
C.
It consists mainly of a fixed, static, phospholipid bilayer.
D. It uses proteins as selective gates and sensors.
E. All of the choices are true.
C
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Water moves by (select all correct choices):
A. random molecular motion. B. active transport. C. passive transport. D. osmosis. E. facilitated diffusion.
The citric acid cycle and glyoxylate cycle are similar in many respects. Which of the following statements accurately describes these cycles?
A) Both cycles are catabolic. B) The glyoxylate cycle has only a single decarboxylating reaction. C) In the glyoxylate cycle, two acetyl CoA molecules are used to generate succinate. D) The glyoxylate cycle is used by some organisms to synthesize proteins. E) The citric acid and glyoxylate cycles both occur in the mitochondrion.
Habitat loss, natural catastrophes, and/or excessive harvesting of a species often result in
A) increased gene flow. B) increased fitness of individuals. C) increased mutation rates. D) artificial selection. E) population bottlenecks.
The first self-replicating molecule was probably ________
Fill in the blank(s) with correct word