Among these choices, the largest cell involved in frog reproduction is _____
A) an egg
B) a blastomere in the vegetal pole
C) a blastomere in the animal pole
D) one of the products of the first cleavage
A
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Which of the following reactions would you predict could be coupled to ATP hydrolysis to ADP + Pi to make it energetically favorable, or spontaneous? Choose all that apply
A. creatine phosphate + H2O creatine + Pi, G -10.3 kcal/mol B. phosphoenolpyruvate + H2O pyruvate + Pi, G -14.8 kcal/mol C. glucose 6-phosphate + H2O glucose + Pi, G -3.3 kcal/mol D. glucose 1-phosphate + H2O glucose + Pi, G -5.0 kcal/mol E. glutamic acid + NH3 glutamine, G +3.4 kcal/mol
Which group of organisms played an important role in shaping Earth’s atmosphere?
a. prokaryotes b. eukaryotes c. animals d. cyanobacteria
What is the difference between cross- and self-fertilization?
A) In cross-fertilization the pollen from one plant is used to fertilize the egg of another plant. B) In cross-fertilization the pollen from one plant is used to fertilize the egg from the same plant. C) In self-fertilization the pollen from one plant is used to fertilize the egg from another plant. D) In cross-fertilization insects are used to pollinate the plants, whereas in self-fertilization the investigator pollinates the plants.
Which of the following is false concerning fertilization?
A) The process can take hours to complete. B) Enzymes are released from the acrosome of the sperm to penetrate the egg. C) Most sperm die on their way to the egg. D) Several sperm must contribute their DNA to the egg.