Symbiosis means
a. “the same life.”.
b. “cooperation.”.
c. “living together.”.
d. “united relationship.”.
Answer: C
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What is the minimum number of aminoacyl-tRNA synthetase enzymes needed to attach amino acids to all the various tRNA molecules?
A. 61 B. 20 C. 64 D. As many as there are different tRNAs.
Like many genetic disorders, galactosemia is a
disruption of a metabolic pathway due to a malfunctioning a. reactant. b. cofactor. c. mineral. d. energy source. e. product.
What is the first step during transcription initiation in prokaryotes?
A. RNA polymerase binds to the promoter. B. The transcription bubble is formed. C. Transcription factors bind to the TATA box sequence. D. The DNA double helix is unwound. E. RNA polymerase synthesizes a short primer.
Which of the following is the best definition of "microbial antagonism"?
A) the presence of pathogens on the surface of the skin, which will invade the body through abrasions B) the presence of normal microbiota that protect the body by competing with pathogens in a variety of ways to prevent pathogens from invading the body C) the presence of normal microbiota that can become pathogens under certain conditions D) the ability of microbiota to mutate into pathogens E) the presence of resident bacteria on the surface of the body and in cavities that connect to the surface