The total amount of energy trapped by the autotrophs of an ecosystem is called
A. gross primary consumption.
B. net energy fixation.
C. net primary consumption.
D. net primary production.
E. gross primary production.
E. gross primary production.
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When the SRY gene of the Y chromosome becomes active (around 7 weeks), the ____
a. Müllerian and Wolffian ducts both develop into male reproductive structures b. Müllerian ducts develop into male reproductive structures and the Wolffian ducts disappear c. Müllerian ducts disappear and the Wolffian ducts develop into male reproductive structures d. Müllerian and Wolffian ducts both disappear e. Müllerian and Wolffian ducts both develop into female reproductive structures
The structural genes in the lac operon are transcribed into a single polycistronic mRNA molecule
Indicate whether the statement is true or false
Of those listed below, which category of classification is the most narrow?
A) Class B) Domain C) Family D) Genus
Which of the following will respond to steady pressure?
A) Hair cells B) Olfactory receptors C) Ruffini corpuscles D) Meissner's corpuscles E) Pacinian corpuscles