DNA:a
is composed of nucleotide building blocks.
b. contains uracil instead of thymine.
c. is single-stranded.
d. contains pyrimidines and purines in a 2:1 ratio.
e. contains the sugar ribose.
a
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The amount of energy available to do work is called
A. activation energy. B. free energy. C. potential energy. D. kinetic energy.
Which set of terms refers to structures that all contain valves?
a. arteries, veins, heart b. lymph capillaries, arteries, heart c. lymph capillaries, veins, heart d. arteries, capillaries, heart
A virgin pine forest covers a valley, and one of the inhabitants is a red squirrel species. A large volcanic eruption occurs and separates the valley with a huge lava flow, thus producing two populations of squirrels. What must occur for the two populations of squirrels to be considered separate species?
A. The two squirrel populations must select mates using different behaviors. B. The two squirrel populations must be reproductively isolated. C. The environment must change so that the populations exist in distinct habitats. D. The two squirrel populations must feed on different species of plants. E. The fur color or other morphological characteristic of the two squirrel populations must become distinct.
Juana is exhibiting redness, swelling, and elevated temperature in one area of her arm. She has a condition known as ________
A) inflammation B) anaphylactic shock C) asthma D) passive immunity