Erica is taking birth control pills that have high levels of estrogen. Which of the following is
true about estrogen?
a. Having high levels of estrogen is a risk factor associated with breast cancer.
b. Estrogen moves into the DNA to signal cell division.
c. The production of estrogen decreases when females reach puberty.
d. All of these are true.
D
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Which of the following hypotheses relies on the chemical reaction between hydrogen sulfide (HS2) and iron (Fe) for the built up of a H2 concentration gradient to provide the necessary energy for the reduction of N2 to NH3?
A. Reducing Atmosphere Hypothesis. B. Extraterrestrial Hypothesis. C. Deep-Sea Vent Hypothesis. D. Both Reducing Atmosphere and Extraterrestrial Hypotheses. E. All three hypotheses use this exact reaction to create a chemical gradient to form amino acids.
What standardized symbols are used to represent males and females on a pedigree?
a. a star for males and a square for females b. a question mark for both males and females c. a square for females and a circle for males d. a square for males and a circle for females
Four of the five answers listed below are all of the same class of vitamins. Select the exception
a. Vitamin B6 b. Vitamin B12 c. Vitamin C d. Vitamin D e. folic acid
Amoebas move by
A. cilia. B. gliding mechanisms. C. flagella. D. pseudopods. E. All the choices are correct.