To sterilize instruments contaminated with prions, you should use
a) dry heat.
b) routine autoclaving.
c) UV light.
d) a strong solution of sodium hydroxide.
Ans: d) a strong solution of sodium hydroxide.
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The event called the Cambrian Explosion resulted in an abrupt increase in
A. geological activity. B. diversity of major animal groups. C. algal diversity. D. the number of days in the year. E. the amount of fish, of a single species, in the seas.
You are genetic counselor, and a couple comes to you with concerns that if they have a child together
it could have sickle-cell disease. Genetic tests reveal that the man and woman are both carriers for sickle-cell disease. Which of the following would be a correct thing to tell them?
a. Any child that they produce has a 50% chance of having sickle-cell disease, and the rest will be carriers. b. All of their offspring will have sickle-cell disease. c. They should not have any concerns, as no child that they produce should wind up with sickle-cell disease. d. No child that they produce should wind up with sickle-cell disease, but each of their offspring will have a 50% chance of being a carrier. e. Any child that they produce will have a 25% chance of having sickle-cell disease.
A plant species where each plant can only make either male or female flowers is called a ____ species
and always has ____ flowers.
a. monoecious; complete b. dioecious; imperfect c. dioecious; complete d. monoecious; imperfect e. monoecious; perfect
Which of the following is paired incorrectly?
A) plants; cellulose cell wall B) algae; glycocalyx C) bacteria; peptidoglycan cell wall D) fungi; polysaccharide cell wall E) archaea; protein cell wall