In eukaryotes the DNA molecule that makes up a chromosome is typically ____ and usually has ____
replication origin.
a. circular; one
b. circular; more than one
c. linear; more than one
d. linear; one
e. linear; no
C
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How is lac operon transcription regulated by the presence or absence of lactose?
a. When lactose is not available, the repressor will bind to the promoter and block RNA polymerase from transcribing the genes of the lac operon. b. When lactose is available, the repressor will bind to the lactose instead of blocking RNA polymerase. c. When lactose is not available, the repressor will bind to allolactose. d. When lactose if available, allolactose is produced and binds to the operator, blocking RNA polymerase. e. In the absence of lactose, transcription occurs at a low level resulting in the production of allolactose which in turn stimulates the cell to take up lactose.
When cells metabolize protein, ammonia is formed. An example of an animal that directly excretes ammonia without further modification is a
a. fish. b. bird. c. snake. d. turtle. e. human.
The brain controls organ system function only through direct contact with sympathetic or parasympathetic nerves.
Answer the following statement true (T) or false (F)
Which of the following is not found in tobacco smoke?
A. benzo[a]pyrene B. vinyl chloride C. N-nitrosonornicotine D. mutagens E. asbestos