You are examining an enzyme associated with cysteine biosynthesis. You would expect expression of the enzyme to be
A) amplified when cysteine concentrations are high.
B) induced by cysteine.
C) repressed by cysteine.
D) high when ATP concentrations in the cell are low.
E) controlled by a riboswitch.
Answer: C
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You are in a lab studying a new cell type that has been discovered. You observe a rigid cytoskeleton in this cell, along with a nucleus and a compartmentalized interior. How would you classify this cell?
A. as an advanced prokaryotic cell, because it has a rigid cytoskeleton B. as a primitive prokaryotic cell C. as a possible transitional cell from prokaryotic to eukaryotic D. as a eukaryotic cell that has to be heterotrophic E. None of the answers options is correct.
Enzymes known as HATs ______________ histones, while HDACs ______________ histones
A. deacetylate / phosphorylate B. acetylate / deacetylate C. deacetylate / acetylate D. acetylate / hypermethylate
Opsonins are antimicrobial peptides that play an important role in the innate immunity of the
mammalian intestinal tract.
Indicate whether the statement is true or false.Blood slows down in arterioles due to the large cross-sectional area.
a. true b. false