The animal in the above photograph was
adversely affected by ____ and is making a
comeback thanks to ____.
a. global cooling; heat producing chemical
added to their diet
b. sexually transmitted viruses; a new vaccine
c. limited number of natural cavities; artificial
nesting boxes
d. high incidence of males being born;
transplantation of females from other areas
e. all of these
C
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What part of a taste sensory neuron is directly involved with receiving stimuli?
A. papillae B. microvilli C. supporting cells D. axons
The molecule in the accompanying figure is ____, and has ____
a. unsaturated; a carbon-carbon double bond b. saturated; a carbon-carbon double bond c. unsaturated; no carbon-carbon double bonds d. saturated; no carbon-carbon double bonds e. saturated; a carbon-carbon triple bond
Fragile X syndrome is a human disease caused by a trinucleotide repeat expansion that results in loss-of-function of the FMR1 gene on the X chromosome. An animal model with most features of this syndrome could be created by
A) adding a transgene containing a mutant copy of the FMR1 gene to a mouse or primate genome. B) adding a transgene containing a wild-type copy of the FMR1 gene to a mouse or primate genome. C) knocking out both copies of the FMR1 gene from a mouse or primate genome. D) knocking out one copy of the FMR1 gene from a mouse or primate genome.
Why do people tend to get shorter as they age?
a. they hunch over due to fatigue b. their bones become shorter c. their muscles become shorter d. the intervertebral disks deteriorate e. the vertebral height diminishes