For translation to take place, which of the following would NOT be required to be present?
a. tRNA-amino acid complex.
b. ribosome.
c. mRNA
d. DNA
e. rRNA.
Ans: d. DNA
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Crossing over between homologous chromosomes takes place during
A. prophase II. B. prophase I. C. interphase II. D. interphase I. E. metaphase II.
Which of the following illustrates altruism?
A) Parent birds spend much of their time and energy feeding their young. B) A mother bird pretends to be wounded to distract a predator away from her young. C) Males sing to attract females as mating partners. D) Birds of a different species care for a cuckoo egg. E) Parent birds clean out their nests.
Which statement is false concerning STDs?
A) Most viral STDs can never be eliminated from the body. B) Permanent infertility can be the result of an untreated STD. C) STDs are routinely tested for during all physical examinations. D) Bacterial STDs can be treated with antibiotics.
Who of the following first discovered that some blood leukocytes could engulf disease-causing bacteria?
A. Meister B. Metchnikoff C. Ivanowski D. von Behring