A testcross is performed to determine if a specific individual is a carrier. The results generate a 50/50 ratio of phenotypes. The test subject is therefore ________.
A. homozygous recessive
B. heterozygous
C. heterozygous dominant
D. homozygous dominant
Answer: B
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The pressure-flow hypothesis describes
A. how hormones move through the phloem. B. how carbohydrates enter the sieve tubes. C. how carbohydrates in solution move through the phloem. D. how water and minerals move through the xylem. E. how carbohydrates and minerals move through the xylem.
Deamination of amino acids, in the excretory system, will initially result in the formation of
A. ammonia. B. urea. C. creatinine. D. glucose. E. uric acid.
A major distinguishing feature between monocot and eudicot stems is the organization of the
A. epidermis. B. secondary tissues. C. vascular tissue. D. ground tissues. E. conducting system.
Which of the following structural characteristics is not normally observed in a DNA duplex?
(a) purine–pyrimidine pairs (b) external sugar–phosphate backbone (c) uniform left-handed twist (d) antiparallel strands