If a woman has reached or passed her due date (the date that a woman is expected to give birth), her obstetrician may use hormones to help initiate labor. Which of the following hormones would assist the most in the initiation of labor?
A) HCG
B) FSH
C) progesterone
D) oxytocin
Answer: D
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A population of salamanders consisting of 2150 individuals will lose genetic diversity due to genetic drift at _______ the rate of a population consisting of 250 individuals.
A. five times B. ten times C. one tenth D. twice E. one hundredth
Why is it useful to know the structure of a protein when trying to understand a protein's function?
a. Scientists still don't know exactly what features of a protein's structure determine how a protein works. By gathering information about many different protein structures and correlating them to their known functions, we can try to figure out this relationship. b. Since all proteins have enzymatic activity, we hope to learn what features of a protein make an enzyme a catalyst. c. Since x-rays are used on protein crystals to determine the structure, this research can help us understand the ways in which x-rays can be damaging to the proteins of living cells. d. The enzymatic activity of a protein cannot be measured unless we also have the structure of that enzyme. e. We need to know which amino acids are essential for a cell to function. If we know the structure of an enzyme, we can determine which amino acids are present and how they work in the cell.
The cellular binding of IgE during an allergic reaction causes the release of which chemicals?
a. heparin and bradykinin b. prostaglandins and histamine c. histamine and serotonin d. prostaglandins and bradykinin e. serotonin and prostaglandins
Quantitative inheritance involves the interaction of a number of gene loci. The pattern of genetic transmission typical of quantitative inheritance is ________
A) continuous variation of phenotypic expression B) usually a pattern that clearly reflects dominance and recessiveness C) discontinuous distributions such as 3:1 D) typical of Mendelian inheritance E) a 9:3:3:1 ratio