Which of the following statements is(are) true of
homeotic genes?
a. More than one hundred of them have been
identified.
b. The same mechanisms control their transcription
regardless of the species.
c. Many of them are functionally interchangeable
among species.
d. They likely evolved in the most ancient
eukaryotic cells.
e. All of these are true.
Answer: e
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Which one of the following steps occurs during the multiplication of animal viruses, but not during the multiplication of bacteriophages?
A) assembly B) biosynthesis C) penetration D) uncoating
Induction of capsule formation by B. anthracis can be accomplished with _____ agar
a. 5% sheep blood b. PLET acetate c. bicarbonate d. urea
Posttranslational modification includes ____
a. cleavage of poly-A tails from mRNA b. the binding of miRNAs to mRNA c. the chemical modification, processing, and degradation of proteins d. chromatin remodeling e. splicing of mRNAs
While culturing some cells, you lower the temperature of the culture. What happens immediately to the membrane fluidity?
a) the membrane fluidity fluctuates back and forth from high to low b) nothing happens c) the membrane fluidity fluctuates back and forth from low to high d) the membrane becomes less fluid e) the membrane becomes more fluid