What does contraction of the diaphragm cause?
A) decrease in the volume of the thoracic cavity and, therefore, a decrease in atmospheric pressure
B) decrease in the volume of the thoracic cavity and, therefore, an increase in intra-alveolar pressure
C) increase in the volume of the thoracic cavity and, therefore, a decrease in intra-alveolar pressure
D) decrease in the volume of the thoracic cavity and, therefore, a decrease in intra-alveolar pressure
E) increase in the volume of the thoracic cavity and, therefore, an increase in intra-alveolar pressure
Answer: C) increase in the volume of the thoracic cavity and, therefore, a decrease in intra-alveolar pressure
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When many genes of an organisms are globally regulated, those genes are considered as regulon genes. What is the common theme of such genetic regulation?
A) Genes of regulons are silenced by a common repressor. B) Genes of regulons are able to transcribe mRNA independent of regulation. C) Genes of regulons are much more stable than non-regulon genes. D) Genes of regulons are much less stable than non-regulon genes. E) Individual genes of regulons are regulated independently of each other.
An example of an osmoconformer is:
a. a crab. b. a polychaete worm. c. a fish. d. a sea squirt (tunicate).
The integumentary system functions in
a. ion transport. b. support. c. covering. d. contraction. e. resistance.
The variations in oldfield mouse coat color illustrated in the figure above could result from:
a. genetic differences. b. environmental differences. c. differences in diet. d. exposure to sunlight. e. All of the above.