Which of the following is sometimes referred to as an incomplete digestive tract, with only one opening?
A. A gizzard
B. An intestine
C. A tube-within-a-tube
D. A gastrovascular cavity
E. A muscular pharynx
Answer: D
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Hfr means high frequency of ________, and these cells are capable of transferring genes from their ________ to other cells
A) transformation / chromosome B) transduction / plasmids C) recombination / chromosome D) transduction / chromosome
How does DDT in the environment affect many birds?
A. stunted growth of chicks B. chronic liver failure in adults C. advancing neurological degeneration D. decreased reproductive rate
Which scientist(s) discovered the basis for the
base-pair rule, which stated that the amounts of adenine in all DNA are the same, as are the amounts of cytosine and guanine?
a. Watson and Crick b. Beadles c. Chargaff d. Franklin e. Pauling
Which of the following statements is(are) TRUE of
pigments? a. They absorb some photons. b. They reflect some photons. c. They absorb photons of specific colors. d. They absorb photons of specific wavelengths. e. They do all of these.