A mutation in which one of the following genes can lead to breast cancer?
A) BT05
B) HeLa
C) BRCA1
D) BCG
E) BCG2
C
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The venom of black widow spiders (Latrodectus mactans) contains an enzyme that hydrolyzes lecithin to the phospholipid lysolecithin. The lysolecithin lyses red blood cells, destroying them. One possible mechanism whereby lysolecithin disrupts the plasma membranes of red blood cells is that it
A) is toxic to red blood cells. B) may act in a manner similar to detergents. C) binds calcium ions, compromising membrane integrity. D) acts as a second messenger to stimulate apoptosis. E) None of the above is a possible mechanism.
The CAM pathway
a. involves only the Calvin-Benson cycle. b. involves only the C4 cycle. c. is used by plants in humid regions. d. is also known as photorespiration. e. needs day and night for completion.
For each of the following lac operon mutations, state whether transcription of ß-galactosidase will increase, decrease, or be unaffected. a. Plac- b. lacY+ c. lacI- d. lacO- e. lacA-
What will be an ideal response?
_______ in the liver may play a role in producing the enzymes that help detoxify drugs.
A) mitochondria B) rough endoplasmic reticulum C) smooth endoplasmic reticulum D) Golgi apparatus