Most cancers require at least two mutations: 1) one in an oncogene, which encodes proteins that trigger cell division,
and 2) one in a tumor suppressor gene, whose protein products, in their unmutated form, play a key role in preventing the
cell cycle from progressing if the DNA is damaged or in the absence of specific cues. Which class of proteins might be
considered tumor suppressors?
a. Cdk inhibitors
b. cyclins
c. growth factor receptors
d. microtubules
e. transcription factors
ANSWER: a
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The earliest RNA probably functioned in
A) catalysis. B) self-replication. C) both catalysis and self-replication. D) neither catalysis nor self-replication.
The DNA of an organism is studied and found to contain 14% guanine. This organism should have
____% thymine and ____% cytosine in its DNA.
a. 86; 14 b. 14; 36 c. 36; 36 d. 14; 86 e. 36; 14
Blood clots are formed by platelets and the plasma protein
A) thrombus. B) fibrin. C) erythropoietin. D) fibrinogen.
Beta-oxidation of fatty acids produces (acetic acid/acetyl-CoA/glycerol)
What will be an ideal response?