A defective ribosome would have the MOST detrimental effect on
A. translation.
B.
replication.
C.
transcription.
D.
replication and transcription.
E.
replication and translation.
A. translation.
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When threshold potential is reached, which of the following occurs?
a. The activation gates of Na+ channels close. b. The inactivation gates of Na+ channels close. c. The activation gates of K+ channels close. d. The inactivation gates of Na+ channels close. e. Na+/K+ active transport pumps are activated.
The development of normal maternal behavior in female mice depends on interactions between the female and her young and the presence of a gene called fosB. In mice with functional fosB genes, a sequence of events occurs after babies are born.
Arrange the events in their normal sequence following the birth of baby mice for a wildtype female. ___ Female crouches over young and retrieves them if they leave the nest. ___ Auditory, olfactory, and tactile signals about the young are sent to the hypothalamus. ___ Neural circuitry within the hypothalamus is modified, facilitating maternal behavior. ___ Female inspects newborns. ___ The gene fosB is activated, producing protein that activates other genes.
What is the life history adaptation called where organisms produce offspring several times over many seasons?
A. Iteroparity B. Alloparity C. Polyparity D. Biparity E. Semelparity
Which of the following cell types do not contain a nucleus?
A. Prokaryotes B. Eukaryotes C. Plant cells D. Protists