A small molecule of RNA is transcribed in the nucleus. It is folded, cleaved by dicer protein, and then
binds to a target molecule of mRNA. This molecule of RNA must be
a. miRNA.
b. siRNA.
c. an mRNA that was not properly capped.
d. an mRNA that never received its poly-A tail.
e. a transcript for a masking protein.
A
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Which molecule in the Krebs cycle acts as a substrate of the first reaction and is a product of the last reaction?
1.pyruvate 2.acetyl-coenzyme A 3.citrate 4.oxaloacetate
During cell division the progeny of a trypanosome express a different VSG gene than their parents. Why is this done?
A. VSG genes inhibit phagocytosis. B. To signal endocytosis of the parasites C. VSG genes activate photoheterotrophy. D. To hide from the host's immune system
The specificity principle refers to the fact that training is specific to the muscles exercised.
a. true b. false
Growth of new blood vessels is stimulated by vascular endothelial growth factor (VEGF). This ligand binds to the VEGF receptor, which leads to the dimerization and autophosphorylation of this receptor on cytoplasmic tyrosines. What type of receptor is the VEGF receptor?
A. Enzymatic receptor B. G protein-coupled receptor C. Steroid hormone receptor D. Channel-linked receptor