Multiple hydrogen bonds together stabilize proteins into a spiral structure called a ____
a. water lattice
b. alpha helix
c. chemical groups
d. delta minus
e. delta plus
ANSWER: b
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The lens of the eye loses _______ with age and cannot change from viewing distant objects and close objects as readily as before.
Fill in the blank(s) with the appropriate word(s).
Which of the following observations was not considered by Darwin as he developed the theory of evolution by natural selection? a. Populations can produce more individuals than the environment can support
b. Individuals that are better suited to their environments produce more offspring. c. Variation exists within populations, and some variants are better suited to their environments than others. d. Individuals that are less well suited to their environments produce no offspring.
Hormone messages are received by
A. neurotransmitters. B. receptor molecules on target cells. C. dendrites. D. all body cells.
During the ____ period, life first appeared on land, but it was not until the ____ period that animals first appeared on land.
What will be an ideal response?