Because of the atomic structure of carbon, it tends to form
a. covalent bonds.
b. ionic bonds.
c. hydrogen bonds.
d. sulfide bonds.
e. bonds only with hydrogen.
A
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A male cricket creates sounds that we call "chirps" by rubbing one wing against the other. When is this considered an act of communication?
A. Every time the cricket produces a chirp regardless of whether the signal is received by an organism. B. Every time a member of its own species hears a chirp regardless of its response to the signal. C. Every time a female member of its species hears a chirp and changes her behavior in response to the signal. D. Every time the chirp is heard by some other organism that changes its behavior in response to the signal.
________ are small peptide molecules (10—50 amino acids in length) that affect membrane permeability.
Fill in the blank(s) with the appropriate word(s).
Hershey and Chase performed an experiment in which they used radioactive isotopes of phosphorus and sulfur to label different components of bacterial viruses. Their results clearly showed that
a. DNA was entering into the infected bacteria. b. the viruses did not contain protein. c. the viruses did not contain DNA. d. protein was entering into the infected bacteria. e. genetic material normally contains radioactive isotopes.
Where is the amino-acid binding site located on the tRNA molecule?
a. in the middle of the loop b. at the end of the 3? end of the molecule c. in the first loop d. along the longest stretch of base pairing in the molecule e. on the 5? end of the molecule