Lactose is a disaccharide found in milk. What makes some people "lactose intolerant" as adults?
A) Some people don't produce any enzymes, including the one needed to digest lactose.
B) Lactose can only be digested by people who produce enough lipase to digest it.
C) Lactose-intolerant people don't produce adequate amounts of lactase.
D) The active site of the lactose-digesting enzyme can vary from person to person.
C
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Why would the loss of helper T cells due to HIV infection result in the immunodeficiency associated with AIDS?
A. Helper T cells are central to the activation of other parts of the immune system. B. Helper T cells are normally present in higher numbers, so their loss reduces the total number of immune cells. C. Without helper T cells, plasma cells would not secrete antibody. D. Infection of the helper T cells could lead to infection and loss of progenitor cells, thereby eliminating all immune cells.
In women, blocked oviducts can result from sexually transmitted diseases
a. True b. False Indicate whether the statement is true or false
Which environment would be most likely to harbor a biodiversity hotspot?
a. tropical island b. temperate grassland c. temperate deciduous forest d. desert e. savanna
Molecular analysis of lactase DNA __________ in humans shows that genes for that enzyme have __________ evolved in Africa and Europe to produce the same result.
Fill in the blank(s) with the appropriate word(s).