In peas, the round allele is dominant over the wrinkled allele. A plant with round peas was crossed to a plant with wrinkled peas and all of the resulting plants had round peas. What is the genotype of the parents in this cross?
A) RR × rr
B) RR × Rr
C) Rr × rr
D) Rr × Rr
E) rr × rr
A
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In a chemical reaction, the standard free energy change (?G°') is calculated to be -3.67 cal/mol. What can be said of the chemical reaction?
A) The reaction is at equilibrium under standard conditions. B) The reaction is spontaneous under standard conditions. C) The reaction is not spontaneous under standard conditions. D) Reactants predominate over products at equilibrium under standard conditions. E) There can be no reaction.
Contact inhibition is an important mechanism for maintaining cell growth in developed organs and tissues. As long as
the cells maintain contact with each other, they remain in ____ and are prevented from dividing.
a. prophase b. G1
c. G2 d. G0 e. S
The structure labeled “A” in the figure is a(n)
a. club-shaped reproductive cell. b. zygote. c. ascus. d. gill from the underside of a mushroom. e. spore sac.
Mitosis and meiosis differ in a variety of ways. Which of the following is NOT a way in which both processes differ?
A) whether or not crossing over takes place B) the number of chromosomes in the daugther cells C) the number of daughter cells produced D) the stage of the cell cycle when DNA is duplicated