Greg and Andrea are trying to find out how long it takes amylase, a digestive enzyme, to break down a sample of starch. They put their sample in a beaker and covered it with their own saliva. After allowing it to sit on the lab table for 1 hour they measured the remaining surface area of the starch. What is the best way they could improve their experiment?
Use samples made of different types of starches
Use solutions of saliva in which the amount of amylase is known
Use solutions made from the saliva of different people
Use the same type of starch, in varying amounts, with
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A tubal ligation is a permanent sterilization procedure in which a woman's fallopian tubes are blocked or severed. Which of the following explains how this process can be used to prevent pregnancies?
It prevents the egg from traveling to the uterus where it could be fertilized.
It prevents the maturation of the follicle and the release of an egg.
It prevents a zygote from being implanted into the uterine wall.
It prevents the thickening of the walls of the uterus.
Which of the following best explains a long-term disadvantage of antibiotic use in patient care?
Antibiotics are more expensive to manufacture and distribute than vaccines.
Vaccines are covered by most health care plans, while many antibiotics are not.
Most vaccines are harmless, while some antibiotics have dangerous side effects.
Misuse of antibiotics can lead to an increase in antibiotic-resistant strains of bacteria.