Which of the following is a DNA palindrome?
a) 5'GAAATTTC-3'
b) 5'ACGTACGT-3'
c) 5'AATTTTAA-3'
d) 5'AAAATTTT-3'
e) All of the above are palindromes
Answer: c) 5'AATTTTAA-3'
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Steroid hormones are derived from
a. free fatty acids. b. cortisol. c. tyrosine. d. cholesterol. e. alanine.
Which of the following is true of prokaryotes?
A. Prokaryotes have a nucleus. B. Prokaryotes are single-celled. C. Prokaryotes do not have a chromosome. D. Prokaryotes have membrane-bounded organelles. E. Prokaryotes do not have ribosomes.
Mendel called a trait that is masked
a) homozygous. b) heterozygous. c) dominant. d) recessive. e) None of the answers are correct.
Which sequence places the tissues in the stem of a young tree in the correct order, starting from the exterior of the plant with the outermost layer of stem tissue, and moving toward the centre?
a. secondary phloem ? primary xylem ? secondary xylem ? primary phloem b. primary phloem ? secondary xylem ? secondary phloem ? primary xylem c. primary phloem ? secondary phloem ? secondary xylem ? primary xylem d. primary xylem ? secondary xylem ? secondary phloem ? primary phloem