Answer the following statements true (T) or false (F)
1. Replication takes place during the G1 phase of interphase.
2. During the cell cycle there are several checkpoints that ensure that the cell cycle is proceeding correctly.
3. Cells that produce telomerase can usually divide many more times than cells that do not produce telomerase.
4. An abnormal mass of tissue is a tumor.
5. If a cancer metastasizes, its cells travel through the bloodstream or the lymphatic system and colonize other areas of the body.
1.FALSE
2.TRUE
3.TRUE
4.TRUE
5.TRUE
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About 12,000 years ago, a mass extinction event occurred and 75% of the world's large mammal species were eliminated. While a small number of cheetahs managed to survive and restore the world's population of cheetahs, this event caused an extreme reduction of the cheetah's genetic diversity. Based on the principles of natural selection, which of the following is a consequence of their reduced genetic diversity?
A. Cheetahs are unable to effectively compete with each other for resources. B. Cheetahs have very little heritable variation, which will make it difficult for them to adapt as the environment changes. C. Cheetahs have never fully adapted to the current environment. D. Cheetahs within the same population do not vary in their reproductive success.
The definition of transformation is
A) the shift of genetic information from DNA to protein. B) the genetic alteration of an organism. C) the uptake of genetic information by a cell from the environment. D) Both B and C E) None of these
How are hormones that are made by cell bodies in the hypothalamus delivered to the pituitary gland?
a. via exocrine ducts b. by the systemic bloodstream c. by capillaries that supply the anterior pituitary d. by axons e. by the lymphatic system
In humans, fertilization normally occurs in the
A) uterine tube. B) vagina. C) fimbriae. D) ovary. E) uterus.