A YAC is
a. a vector for cloning genes into yeast cells.
b. a Yeast Activating Complex for inducing expression of genes.
c. a sequence that allows selection of successfully transformed bacteria.
d. a technique for separating DNA fragments according to size.
e. a type of DNA polymerase used in PCR.
Ans: a
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a. 0 b. 1/4 c. 1/3 d. 2/3 e. 1/2
A cell membrane is said to be a fluid mosaic because
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A) increase in hydrogen ions and a decrease in pH. B) decrease in hydrogen ions and an increase in pH. C) increase in hydrogen ions and an increase in pH. D) decrease in hydrogen ions and a decrease in pH.
Although there are many distinct prokaryotic species, most have a small range of shapes, sizes, and growth rates. Which of the following characteristics are not observed in prokaryotes?
(a) a highly structured cytoplasm (b) endoplasmic reticulum (c) the ability to divide rapidly (d) a cell wall