The conversion of gaseous nitrogen (N2) to ammonia (NH4+) occurs during ________.
A. ammonification
B. nitrogen fixation
C. photosynthesis
D. nitrification
E. denitrification
Answer: B
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Optical density and viable cell concentration are LEAST proportional to each other during
A) lag phase. B) exponential growth phase. C) stationary phase. D) death phase.
Genotype means
a. the genes an individual has. b. the number of gametes in an individual. c. the combination of alleles in an individual. d. the observable expression of the genes in an individual. e. the number of chromosomes in an individual.
In cats an X-linked pair of alleles, B and b, controls color of fur. The alleles are incompletely
dominant: B produces black, b produces yellow, and Bb produces tortoise-shell. (a) A yellow cat had a litter of two tortoiseshell kittens and one yellow. What is the sex of the yellow kitten? (b) A tortoiseshell cat brings home a litter of black, yellow, and tortoiseshell kittens. The color of which sex would tell you the color of the tomcat that produced them? (c) A yellow male is crossed with a tortoiseshell female. If the female has all male kittens in her litter of four, what color(s) would they be? (d) A tortoiseshell cat brings home her litter of black, yellow, and tortoiseshell kittens. By what method could you possibly decide whether the male parent was the black tomcat next door? What will be an ideal response?
Which of the following statements correctly describes the normal tonicity conditions for typical plant and animal cells? The animal cell is in _____
A) a hypotonic solution, and the plant cell is in an isotonic solution B) an isotonic solution, and the plant cell is in a hypertonic solution C) a hypertonic solution, and the plant cell is in an isotonic solution D) an isotonic solution, and the plant cell is in a hypotonic solution