When is the root-shoot axis established in the flowering plant Arabidopsis?
a. within hours after the seed germinates
b. shortly after the eight-cell embryo stage
c. during the torpedo stage of embryonic development
d. by the first cell division of the embryo
Ans: d. by the first cell division of the embryo
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________ is a gene silencing technique that is based on the fact that RNA molecules can fold into short, double-stranded regions where the base sequence is complementary.
A) RNA repair B) RNA amplification C) RNA replication D) RNA interference
An alien from another planet landed on earth. He is fascinated by cars and is determined to figure out how they work. He decides to disassemble one of them and examine each part independently. He removes one of the tires and proceeds to learn all he can about the tire. He then removes one of the headlights and proceeds to learn all he can about the headlight. What type of approach is this alien taking to learn about the car?
A. deductive reasoning B. emergent properties C. reductionism D. inductive reasoning
If scientists studying cancer could understand how to promote cell division in cells that do not ordinarily divide, this might help people who had injuries involving
A) muscle or nerve cells. B) intestinal cells. C) bone cells. D) skin cells.
An apoenzyme
A. is the protein part of a holoenzyme. B. is also called a coenzyme. C. is often an inorganic metal ion. D. is part of a simple enzyme. E. is an RNA molecule.