As a result of the hormonal and neuroanatomical differences between the male and female brains of zebra finches,
____.
a. only males sing their species songs
b. only females sing their species songs
c. males sing their species songs at earlier ages than females
d. females sing their species songs at earlier ages than males
e. females only sing their species songs later in their lives
ANSWER: a
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Based on what you know about eukaryotic cells, what is one of the arguments against using RNA as the genetic storage molecule?
A. Because RNA uses uracil instead of thymine, it cannot hold genetic information. B. RNA has a negatively charged sugar phosphate backbone. C. The structure of RNA does not allow for double-stranded base pairing. D. There is no current mechanism to package enough RNA to encode all the information needed by the cell. E. The secondary structure of RNA prevents its replication before cell division.
Answer the following statements true (T) or false (F)
1. You would not expect a protein synthesis inhibitor to block learning processes in the relevant neurons of Aplysia or yourself. 2. Even single stimuli can activate protein kinase A in presynaptic neurons involved in the gill-withdrawal reflex in Aplysia. 3. New neurons do not appear in the brain of adult vertebrate animals. 4. Activities like playing a musical instrument regularly can affect the size of brain regions involved in performing these activities.
Which is a defining characteristic of adaptive immunity?
a. nonspecificity b. diversity c. short-lived responses d. self recognition e. reliance on surface barriers
In many species of fireflies, males flash light from their abdomens to attract females. Each species has a different flashing pattern. This is an example of
A) mechanical incompatibility. B) ecological isolation. C) temporal isolation. D) behavioral isolation. E) geographic isolation.