Prostaglandin-triggered contractions of smooth muscle in the uterine wall can cause ____
a. menstrual cramps
b. orgasm
c. ovulation
d. menopause
e. hormone production
a
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The genes that play a role in the biological clock form part of gene storing structures in the
nucleus known as
a. nucleotides. b. chromosomes. c. tissues. d. proteins
The neck of open culture tubes should be sterilized after removing the cap and before replacing the cap. Open tubes should always be ___________ to minimize the possibility of airborne contamination.
A) held at an angle B) labeled with tape C) carried in a sleeve D) inoculated with the nondominant hand
The L-ring in flagella is found in
a. all bacteria with flagella b. only bacteria with multiple flagella c. gram negative organisms with flagella d. gram positive organisms with flagella e. it is only found in archaea with flagella
A DNA library has been constructed by purifying chromosomal DNA from mice, cutting the DNA with the restriction enzyme NotI, and inserting the fragments into the NotI site of a plasmid vector. What information cannot be retrieved from this library?
(a) gene regulatory sequences (b) intron sequences (c) sequences of the telomeres (the ends of the chromosomes) (d) amino acid sequences of proteins