What serves as a messenger for taking genetic information from the nucleus to the cytoplasm?
What will be an ideal response?
mRNA
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Gamete formation ____
Four of the five actions listed below are responses of
the body to heat. Select the exception. a. increased sweating b. increased retention of blood in the core region c. decreased rate of muscle activity d. increased water loss e. dilation of peripheral blood vessels
The function of the epididymis is to:
a. secrete an alkaline fluid that neutralizes the acids of the vagina. b. produce a nutritive fluid for the sperm. c. provide a place for maturation and storage of sperm. d. secrete mucus that lubricates the penis. e. maintain sperm at a low body temperature
A student uses restriction enzymes to cut a DNA molecule into fragments. The digested DNA is loaded into the wells of an agarose gel and the gel is subjected to an electric current. Upon completion of the run, the gel is stained. Which of the following is true of the dye used to stain the fragments?
(A) It increases the contrast between the agar and the DNA fragments. (B) It must be accounted for when calculating the molecular weight of the fragments. (C) Its charged areas interfere with the migration of the DNA. (D) It is bonded only to the sticky ends of the fragments and can directly determine the sequence of the DNA fragments. (E) It gives a three-dimensional view of the structure of the DNA fragments.