From the following answers, which is considered by most biologists to be the most accurate in supporting the theory of evolution?
A. fossils
B. embryology
C. DNA sequencing
D. genetic equilibrium
Answer: C. DNA sequencing
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The stage of mitosis when sister chromatids separate from each other and migrate to opposite poles of a cell is called
A) interphase. B) prophase. C) metaphase. D) anaphase. E) telophase.
When pollen from one species lands on the stigma of a flower from another species
a. the pollen tube typically does not develop. b. the pollen tube typically forms, but the sperm cannot penetrate the egg. c. the pollen tube typically forms and grows to the ovary, but then stops. d. the pollen tube typically forms, but the sperm are killed. e. the pollen tube typically forms and the egg is usually fertilized, but the embryo rarely grows.
Which of the following is a goal of chemotherapy?
1.disruption of the normal cell cycle 2.alteration of the plasma membrane 3.increase in the secretion of interleukins 4.stimulation of cytotoxic T cell production 5.turning on tumor suppressor genes
What type of statistical analysis is used to compare observed and expected results in order to evaluate the validity of an estimate based on the Hardy-Weinberg equilibrium?
What will be an ideal response?