As the initial cleavage divisions proceed in a frog embryo, which of the following results?
A. the embryo increases in size
B. The cytoplasmic content of the individual cells increase
C. The yolk mass increases in size.
D. Individual cells become smaller
E. Individual cells become haploid
Ans: D. Individual cells become smaller
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Which of the following statements is true?
a. Gene mutations occur independently of each other. b. Gene mutations are relatively rare. c. Ionizing radiation causes chromosomal damage and free radical formation. d. Mutations are random; that is, it is impossible to predict exactly when a specific gene will mutate, but an expected frequency can be assigned. e. All of these are true.
Why can corn seeds germinate in total darkness?
A. The seed coating absorbs water. B. The endosperm provides the embryo with the nutrition needed during the initial germination stages. C. Seeds are heterotrophic and can capture nutrients from the soil. D. Soil microbes degrade the seed coating allowing the seed to germinate.
Simple sugar converts from a straight-chain into a ring form when the __________ group combines with a hydroxyl group.
A. aldehyde B. sulfhydryl C. amine D. carbonyl E. methyl
Match the following
0.1ml A) 100ul B) 1000ul C) 10ul