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.
5 Female crouches over young and retrieves them if they leave the nest.
2 Auditory, olfactory, and tactile signals about the young are sent to the hypothalamus.
4 Neural circuitry within the hypothalamus is modified, facilitating maternal behavior.
1 Female inspects newborns.
3 The gene fosB is activated, producing protein that activates other genes.
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In the female reproductive cycle, the endometrium is thickest ____
a. during the menstrual phase b. during the proliferative phase
c. shortly before ovulation d. during ovulation e. during the secretory phase
The wing of a bat, the flipper of a whale, and the arm of a human have a similar structure and all can trace their lineage back to a common ancestor. This would be an example of which of the following?
a. a homologous structure b. a vestigial structure c. an analogous structure d. none of the above
Prokaryotic cells do not possess DNA.
Answer the following statement true (T) or false (F)
Ribozymes are:
a. capable of replicating RNA. c. capable of copying RNA into DNA. b. proteins. d. RNA enzymes.