Restriction enzymes:
A. are found in a wide variety of mammalian cell types.
B. cleave invading bacterial DNA.
C. always produce sticky ends.
D. typically cleave at palindromic sequences 4–8 base pairs long.
E. are necessary for joining two DNA fragments together.
D
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G proteins are inactivated when ____
a. GDP is converted to GTP b. GTP is converted to GDP c. the G protein rebinds the receptor d. the G protein is released from the receptor e. the receptor is broken down
XY individuals with total androgen insensitivity syndrome ____
a. do not secrete testosterone b. do not have testes c. have mutated testosterone receptors in their cells d. secrete more estrogen than testosterone e. have normal male genitalia
The endosymbiont theory is an explanation for some of the changes that occurred between the earliest cells on Earth and current cells on Earth. This theory, which is supported by a vast amount of scientific evidence, explains that mitochondria and chloroplasts had their origins as free-living organisms that were later incorporated into cells. How might further evidence change this theory?
A) If more evidence supports the endosymbiont theory, it will become a scientific hypothesis. B) If more evidence supports the endosymbiont theory, it will become a scientific law. C) Evidence that does not support the theory will be disregarded because theories cannot be revised. D) Evidence that does not support the theory could cause the theory to be revised
Organelles found in algae but not found in protozoa or fungi are the
A) Chloroplasts B) Golgi apparatus C) Endoplasmic reticulum D) Mitochondria E) Lysosomes