Which of the following is consistent with the principle of base pairing?
(a) purine-purine
(b) pyrimidine-pyrimidine
(c) adenine-thymine
(d) guanine-thymine
(c) adenine-thymine
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The dynamic scaffolding for many cellular processes
is formed by a. microfilaments. b. microtubules. c. intermediate filaments. d. myosin molecules. e. actin molecules.
Stomata are:a
waxy layers that cover leaves. b. openings in the leaf epidermis. c. extensions of bundle sheaths. d. particularly numerous on the upper epidermis. e. guarded by two stipule cells.
In the process of transcription, _____.
A. proteins are synthesized B. mRNA attaches to ribosomes C. DNA is replicated D. RNA is synthesized
Which of the following statements about gas exchange in animals with interacting circulatory and respiratory systems is FALSE?
A) Carbon dioxide moves from the tissues into the blood by diffusion. B) Gases are transported in the circulatory system by the bulk flow of blood. C) Oxygen is actively transported into the circulatory system. D) Air or water moves across the respiratory surface by bulk flow. E) Oxygen and carbon dioxide pass through respiratory membranes by diffusion.