The following are major events in expression of a gene for insulin, which is secreted outside of certain
mammalian cells. Place these events in order, from earliest to latest.
1: binding of a release factor
2: binding of signal recognition particle (SRP)
3: binding of transcription factors
4: removal of introns
5: scanning of mRNA
a. 4?2?3?1?5
b. 1?4?3?2?5
c. 5?2?1?4?3
d. 3?4?5?2?1
e. 3?2?1?5?4
D
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Which of the following membrane proteins uses energy in the form of ATP to move molecules across the plasma membrane?
a. passive transporter b. active transporter c. receptor protein d. recognition protein
Which of the following is not characteristic of ciliates?
a. They use cilia as locomotory structures or as feeding structures. b. They are relatively complex cells. c. They can exchange genetic material with other ciliates by the process of mitosis. d. Most live as solitary cells in fresh water. e. They have two or more nuclei.
Also called motor neurons, the ___________ send signals from the brain to the glands and muscles:
a. efferent neurons b. afferent neurons c. interneurons d. neurotransmitters
Normal bacterial flora are clinically beneficial because they produce:
a) antibodies b) bacteriocins c) cytokines d) antihistamine