In Mendel's pea plants, yellow seeds are dominant to green seeds. Purple flowers are dominant to white flowers. Use Y and y for the seed color alleles and P and p for the flower color alleles. Flower color and seed color assort independently. A plant of
unknown genotype with yellow seeds and purple flowers is crossed to a plant with green seeds and white flowers. The offspring all have yellow seeds, but some have purple flowers, and some have white flowers. What is the genotype of the yellow-seeded, purple-flowered plant?
A) Yypp B) YyPp C) YYPP D) YyPP E) YYPp
Answer: E
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Which of the following structures allows a bacterium to propel itself through its environment?
a. microfilaments b. intermediate filaments c. microvillus d. flagellum e. microtubule
Ovulation is triggered primarily by
a. a surge of LH that occurs halfway through the menstrual cycle. b. the falling levels of estrogen and progesterone. c. the rising levels of progesterone. d. both a surge of LH that occurs halfway through the menstrual cycle and the rising levels of progesterone. e. the formation of a polar body.
Solution "A" has a solute concentration of 10% while solution "B" has a solvent concentration of 80%. If they are separated by a selectively permeable membrane
A. the net direction of water movement will be from solution "A" to solution "B". B. the net direction of water movement will be from solution "B" to solution "A". C. there will be no net movement of water. D. the system is in dynamic equilibrium to begin with.
)
A. Complement B. Toll receptors C. Interferon D. Peptidoglycan E. Lipopolysaccharide