The organelle involved in intracellular digestion of food particles is the
A. smooth endoplasmic reticulum.
B. transitional vesicle.
C. mitochondria.
D. lysosome.
E. Golgi apparatus.
Answer: D
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Histone acetyl transferases exert their effect on gene activity by _____
A) neutralizing positive charges on the lysines of histones B) introducing negative charges on the glutamic acids of histones C) modifying the DNA sequence of the promoter D) increasing the affinity of transcriptional activators for DNA E) increasing the affinity of transcriptional inhibitors for DNA
As radiation strikes molecules in cells, it creates ____
a. charged atoms called isotopes b. charged atoms called ions c. excess storage of tRNA d. excess copies of mRNA e. excess DNA polymerase
An allosteric inhibitor
A) increases the rate of substrate binding. B) binds and activates the high-affinity state of the enzymes. C) is identical to the active site. D) binds at the regulatory site. E) is converted to an activator by the enzyme.
A weak acid may function as a
A) transfer group. B) buffer. C) hydroxyl donor. D) cation. E) salt.