Fate maps of C. elegans development reveal that all somatic cells of the adult are directly descended from ____
produced during early development.
a. two germ-line cells
b. cells of the hypodermis
c. five somatic founder cells
d. three endodermal cells
e. five germ-line cells
ANSWER: c
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In a neuron at rest, the membrane is most permeable to
A. potassium. B. sodium. C. chloride. D. calcium. E. magnesium.
Cells can be described as having a cytoskeleton of internal structures that contribute to the shape, organization, and movement of the cell. All of the following are part of the cytoskeleton except
a. the nuclear envelope. b. microtubules. c. microfilaments. d. intermediate filaments. e. actin.
If a DNA sequence on one strand is ATCGATG, what is the corresponding sequence on the other strand?
a. TAGCTAC b. UAGCUAC c. TUGCUTC d. ATCGATG e. TTACGTC
Bacteriophages are attractive tools to use in combating bacterial infections because of all of the following reasons EXCEPT:
A) they have a broad host range B) they mutate readily should pathogens also alter their genetic virulence C) they can provide immunity by inserting their DNA into human cells D) many bacteria are resistant to our antibiotics E) they are more expensive than drugs