Which of the following is a true statement regarding mitosis?
(A) Replication of chromosomes occurs at the start of mitosis
(B) Cytokinesis precedes alignment of replicated chromosomes along the equatorial plate
(C) Replicated chromosomes pairs up in tetras prior to separation of chromatids
(D) Mitosis plays a role in growth, repair, and asexual reproduction
Ans: (D) Mitosis plays a role in growth, repair, and asexual reproduction
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Mifepristone, also known as RU-486, is used in combination with ____ to terminate an unwanted pregnancy
a. copper b. cyclooxygenase c. estrogen d. progesterone e. a prostaglandin
Which of the following would be the least
satisfactory organism for genetic research? a. humans b. bacteria c. corn d. fruit flies e. peas
Scientists will never know for sure why dinosaurs became extinct. Therefore, scientists should
A) accept the current theory about dinosaur extinction as the best possible theory. B) continue to learn as much as they can about dinosaur extinction. C) stop studying dinosaurs and study only living animals. D) work to raise live dinosaurs to study.
You culture cells and selectively block MYC gene expression. What is the effect on the cells?
a) Cell progression through the cycle continues unabated. b) The cells arrest in the middle of mitosis. c) Cell progression through G1 is blocked. d) The cells arrest in the middle of S phase.