A fertility doctor is trying to determine why a couple is infertile. It has been determined that the woman is fertile, so the problem must be with her partner. In analyzing the partner's semen, the doctor notices that it seems to be lacking fructose
The structure malfunctioning must be the ________. A) bulbourethral glands
B) prostate gland
C) seminal vesicles
D) urethra
C
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Which of the following is NOT an autoimmune disease?
a. type I diabetes b. rheumatoid arthritis c. hepatitis d. lupus e. multiple sclerosis
When an infection occurs by the same
pathogen, the immune response is more rapid the next time around thanks to
a. effector cells. b. memory cells. c. naive T cells. d. neutrophils. e. eosinophils
If a person has two different copies of the same gene, they are said to be ___________.
a) Homozygous b) Heterozygous c) Polygenetic d) Haploid
The striking dissimilarities in plant communities among different biomes that have the same average yearly amount of rainfall can be explained by the fact that
A) plant communities are influenced more by the acidity of rain than by the amount of rainfall. B) plant communities are not influenced by rainfall. C) plant communities occur randomly, depending on where seeds are blown or carried. D) plant communities evolve more slowly than changes in weather patterns. E) temperature and rainfall interact to influence plant communities.