Which of the following is NOT a drawback in using a microscope to count cells?
a. Debris in the sample may be mistaken for microbial cells.
b. Motile cells must be immobilized before counting.
c. Cells are difficult to stain.
d. Without specific stains, dead cells cannot be distinguished from live cells.
Answer: C
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Tritiated hydrogen (3H) differs from hydrogen (1H) in that
A. 3H has 2 more protons than 1H. B. 3H has 2 more electrons than 1H. C. 3H has 2 more neutrons than 1H. D. 3H has the same number of neutrons as 1H. E. 3H has a different electron configuration than 1H.
Short tandem repeats (STRs)
A. are useful in identifying specific individuals. B. are important sites in vectors where foreign DNA can be integrated. C. are errors that can arise during DNA sequencing. D. are DNA fragments generated during PCR.
The sex chromosome composition of a person
with Turner syndrome is a. XXX. b. XO. c. XXY. d. XYY. e. none of these
Mycorrhizae associations are
A) very unusual. B) common; at least 80% of the species of plants form these associations. C) common only in nutrient-rich environments. D) absolutely necessary for survival. E) common only to species, such as grasses.