The common passageway for air and food is the ____
a. nasal cavity
b. epiglottis
c. glottis
d. pharynx
e. larynx
ANSWER: d
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Which of the following genera has proved useful for manipulating plant cells?
A. Escherichia B. Bacillus C. Pseudomonas D. Agrobacterium
A decrease in blood glucose triggers action by the _____ stimulated by _____
a. liver; an increase in glucagon b. liver; the absence of insulin c. liver, muscles, and fat; an increase in glucagon d. liver, muscles, and fat; the absence of insulin e. hypothalamus; the breakdown of sugar
In a dihybrid cross involving two autosomal traits on different chromosomes in which the parentals are purebred for the opposite forms of both traits, how many of the offspring would be expected to be homozygous recessive for both traits?
A) 1 out of 16 B) 3 out of 16 C) 6 out of 16 D) 9 out of 16
The classic "beads-on-a-string" structure is the most decondensed chromatin structure possible and is produced experimentally. Which chromatin components are not retained when this structure is generated?
(a) linker histones (b) linker DNA (c) nucleosome core particles (d) core histones