What is the main sex hormone in male humans?
A. follicle-stimulating hormone (FSH)
B. luteinizing hormone (LH)
C. interstitial cell-stimulating hormone (ICSH)
D. estrogen
E. testosterone
Answer: E
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In the scientific method, hypotheses lead most directly to:
A. predictions B. theories C. experiments D. observations E. conclusions
The loss of function of this sensory structure renders fish unable to school
a. vestibular apparatus b. statocyst c. lateral line d. eyes e. saccule
Which of the following statements concerning enzymes is FALSE?
a. Each enzyme has an optimal temperature. b. Each enzyme has an optimal pH. c. Most enzymes are highly specific. d. Some enzymes require cofactors. e. Most enzymes are RNA molecules
Which of the following is a difference between gram+ and gram- cells?
a. gram+ cells contain less peptidoglycan than gram- cells b. gram- cell walls contain more peptidoglycan than gram+ cells c. only gram+ cells have peptidoglycan d. only gram- cells have a lipopolysaccharide layer