Which structure is the end of the digestive system?
a. rectum
b. large intestines
c. small intestines
d. anus
e. appendix
ANSWER: d
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Which of the following environmental factors generally do(es) not have an impact on the efficiency of an antimicrobial agent?
A. presence or absence of a biofilm B. concentration of organic matter C. refractive index D. pH
Which adaptations originated in some fishes and enabled vertebrates to thrive on land?
A. limbs and lungs B. lungs C. fins D. limbs E. lungs and fins
Most of the chromosomes in humans are sex chromosomes.
a. true b. false
Which of the following best describes why ice was used during this experiment?
a. To increase the activity of the enzyme b. To retard the breakdown of the catalase c. To purge the solution of excess air trapped during blending d. To slow the catalase molecules to increase the probability of contact with the hydrogen peroxide molecules e. To increase the size of the active site on the enzyme