An enzyme and its substrate interact at a surface crevice on the enzyme called a(n)
a. receptor site.
b. active site.
c. transition point.
d. target site.
e. contact point.
B
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Which type of chemical bonds are found within a water molecule?
a. hydrogen b. ionic c. polar covalent d. nonpolar covalent e. triple
Name that STD! Choose from the following STDs. You may use each choice more than once. In some cases, there may be several correct answers
gonorrhea, chlamydia, human papillomavirus (HPV) infection, genital herpes, syphilis • Which STD usually causes death if it is left untreated? • This STD goes through three stages before causing death. • Which STD is suspected after an abnormal PAP test in females? • Name two STDs that can be contracted on mucus membranes other than those of the reproductive systems. • If an STD is detected early, many can be easily treated. Which STD cannot be treated (meaning that the person can never get rid of it, even though it may be managed)? • Name three STDs that may have no symptoms (in either men or women). • John has symptoms of an STD (burning sensation while urinating and a yellowish discharge from the urethra) that popped up 3 days after sexual contact with a questionable partner. Based on his symptoms and this timing, John probably has which STD? • This STD can cause genital warts. • Which STD can cause a rash over the entire body? • Several STDs can be transmitted by oral sex. Name one. • For which STD is there now a vaccine available for females?
The relative fitness values of three genotypes are: wAA = 1.0, wAa = 1.0, and waa = 0.7. What is the predicted equilibrium allele frequency if the rate of mutation of A to a is 2 x 10^-5?
a. q hat = 0.022 and p hat = 0.978 b. q hat = 0.008 and p hat = 0.992 c. q hat = 0.005 and p hat = 0.995 d. q hat = 0.011 and p hat = 0.989
Plant hormones bind specific cellular receptor molecules that trigger gene expression responses. Which statement is correct concerning these responses?
A. Only cells that express the appropriate receptors can bind hormones. B. Only cells in the meristem can respond. C. Only cells that have been previously activated can bind hormones. D. Only cells lacking receptors can bind hormones. E. None of the answers are correct.