Which of the following is synonymous with apoptosis?
a. programmed cell death
b. the loss of contact inhibition
c. programmed cell life
d. the gain of contact inhibition
Answer: a. programmed cell death
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Which of the following statements about double fertilization in angiosperms is correct?
A) One pollen grain combines with the egg to form the zygote, and one pollen grain combines with the polar nuclei to form endosperm. Two sperm combine with a polar nucleus to form endosperm. B) Two pollen grains combine with two ovules to form the zygote and endosperm. C) One sperm combines with the polar nuclei to form the zygote, and one sperm combines with the egg to form endosperm. D) One sperm combines with the egg to form the zygote, and one sperm combines with the polar nuclei to form endosperm.
Habitat changes for cichlids living in Lake Victoria are causing a change in:
a. mate choice. b. species diversity. c. coloration of male cichlids. d. frequency of hybrids. e. All of these
A culture medium on which only gram-positive organisms grow, and in which a yellow halo surrounds Staphylococcus aureus colonies, distinguishing S. aureus from other growing species, is best described as
a. a selective, but not differential medium. b. a differential, but not selective medium. c. an enrichment culture d. both a selective and differential medium. e. both a differential and enrichment culture.
Answer the following questions true (T) or false (F)
1. The X and Y chromosomes are not homologous, but in the meiosis of sperm formation, they pair and separate in anaphase I as though they were homologous. 2. Mendel's contribution to genetics was the discovery of DNA. 3. Mendel's crosses with pea plants disproved the notion that, when individuals with two different traits are mated, the genetic information blends in the offspring and is not retained as separate elements.