Cellular membranes are
A. solely composed of lipids.
B. composed of a single layer of amphipathic molecules.
C. found in eukaryotes, but not prokaryotes.
D. fluid.
E. selective to the transport of gases and small molecules only.
Answer: D
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Which animal phylum lacks a network of nerve cells for gathering information from the environment?
A. Porifera - sponges B. Cnidaria - jellyfish, sea anenomes C. Platyhelminthes -- flatworms D. Nematoda - roundworms E. Mollusca - octopus, squid, clams, snails, and other mollusks
The flow of hydrogen ions out of the thylakoid compartment:
a. provides energy to produce ATP molecules b. recharges the photosystems c. converts ATP into ADP d. causes excitation of chlorophyll molecules e. generates oxygen molecules
Could two phenotypically normal parents have a child with cystic fibrosis?
a. Yes b. No
For a given element, all atoms of that element
have the same number of
a. neutrons. b. electrons. c. protons. d. protons and neutrons. e. ions