The hormone most directly responsible for stimulating the growth of the endometrium in the first half of the menstrual cycle is ______.
A. progesterone
B. testosterone
C. estrogen
D. LH
Ans: C. estrogen
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What causes antigenic variation?
A. gene mutation B. differential gene expression C. genetic rearrangement D. All of the answer options are correct.
The fundamental difference between an organism's genotype and its phenotype is that
A. the phenotype refers to all of the genetic material in the organism, whereas the genotype represents only the genetic material that is expressed into proteins. B. the genotype refers to eukaryotic genes that contain both introns and exons, whereas phenotype refers to bacterial DNA that has only exons. C. the genotype refers to all of the genetic material in the organism, whereas the phenotype represents only the genetic material that is expressed into proteins. D. the genotype refers to the organism's genes and the phenotype refers to the non-coding segments of DNA.
The capillaries clustered around kidney tubule
cups differ from other capillaries in that they
a. have a much wider diameter. b. are much leakier. c. have arterioles at either end. d. carry lymph with blood. e. have more than one of these characteristics
Mifepristone, also known as RU-486, is used in combination with ____ to terminate an unwanted pregnancy
a. copper b. cyclooxygenase c. estrogen d. progesterone e. a prostaglandin