Which of the following agents is a known cause of
mutations?
a. nonionizing radiation
b. ionizing radiation
c. transposons
d. chemicals in cigarette smoke
e. all of these
Answer: e
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Primary protein structure is formed by
a. hydrophobic interactions. b. hydrogen bonds. c. bonds between amino acids. d. covalent linkages between carbon and oxygen. e. all of these.
Originating from a source outside of the body
What will be an ideal response?
The enzyme peptidyl transferase, which catalyzes the transfer of the polypeptide chain attached to the
tRNA in the __________ site to the aminoacyl-tRNA in the __________ site, is thought to be a(n) __________ molecule and not a protein. a. A; P; rDNA b. P; A; tRNA c. A; P; mRNA d. P; A; rRNA e. P; A; sugar
Which process occurs during labor?
A) positive feedback involving oxytocin and prostaglandins B) negative feedback involving oxytocin and prostaglandins C) positive feedback involving estrogen and human chorionic gonadotropin D) negative feedback involving estrogen and human chorionic gonadotropin