Menstruation
A) is triggered by an LH surge.
B) is triggered by HCG.
C) is triggered by an increase in the levels of estrogen and progesterone.
D) coincides with the beginning of the pre-ovulatory phase of the ovarian cycle.
Answer: D
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Prior to 1940, which type of molecule did scientists consider to be the best candidate for the genetic material?
a. a protein molecule b. a carbohydrate molecule c. a DNA molecule d. a lipid molecule
Which of the following pairs of genotypes result in the same phenotype?
a. IBIB and IAIB b. IAIA and IAIB c. IBIB and IBi d. IBi and ii
Which of the following is an example of heredity?
A) Both moths and birds have wings and can fly. B) Doberman pinschers and boxers have similar body shapes. C) Flying squirrels have a different mechanism of flight than mosquitos. D) Dalmation dogs all have spots. E) Flies and molluscs both have eyes.
The glands of vertebrates are derived from ________ epithelium.
A. scarified B. endocrine C. stratified D. invaginated E. keratinized