The use of a drug to prevent imminent infection is called ________.
A. synergism
B. competitive inhibition
C. lantibiotics
D. prebiotics
E. prophylaxis
Answer: E
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Automated nucleotide sequencing machines detect DNA bands by laser induced ________.
Fill in the blank(s) with the appropriate word(s).
What do photosynthetic organisms often supply to their nonphotosynthetic partners in a mutalistic relationship?
a. sugars through nectar, fruit, etc. b. protection c. a place to live d. a place to reproduce e. essential minerals
Which of these statements about snakes is false?
a. All snakes are carnivores. b. All snakes use internal fertilization. c. All snakes are venomous. d. All snakes have flexible skull bones and hinged jaws. e. Some snakes retain skeletal remnants of hindlimbs.
Why can't plants use N2 directly as a nutrient?
A) The N2 molecule is too large to enter the stomata. B) Most soils are depleted of N2 as a nutrient. C) N2 diffuses out of leaves as quickly as it diffuses in, so it has to be "fixed" to remain in leaves. D) Plants lack the enzymes necessary to convert N2 into NO3?or NH4+. E) Plants must use NO3? to carry out nitrogen fixation.