You analyze a blood sample taken from a man who survived for 2 days in the desert with no water to drink. Based on your knowledge of kidney physiology, you are not surprised to find that his blood level of ADH is
A) higher than normal. B) lower than normal.
C) zero. D) normal.
A
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Which of the following is true of DNA?
A. The nucleotides in one strand are connected by hydrogen bonds. B. A phosphate group in a nucleotide is attached to the 3 carbon in ribose. C. A purine always forms a complementary base pair with a pyrimidine. D. The percentage of the purine A always equals the percentage of the purine G. E. It is used by ribosomes for translation.
Which of the following diseases is associated with faulty DNA repair mechanisms?
A. Alzheimer's disease B. diabetes C. xeroderma pigmentosum D. diabetes and xeroderma pigmentosum E. Alzheimer's disease and diabetes
When two different species require the same resources we may observe
a. intraspecific competition. b. resource partitioning. c. interspecific competition. d. predation. e. symbiosis/parasitism.
Which term refers to hairlike projections, such as root hairs, that are specialized outgrowths of the plant epidermis?
a. bark b. protoplasts c. trichomes d. cuticles