The cells that become eggs that a woman ovulates at age 40 were initially produced
A. at puberty.
B. at her birth.
C. when she was a fetus.
D. about a month before ovulation.
C. when she was a fetus.
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Answer the following statements true (T) or false (F)
1. Most oncogenes encode proteins that function in cell growth signaling pathways. 2. Myc genes tend to be overexpressed in only a few forms of cancer. 3. p53 is a tumor suppressor gene that acts as a sensor of DNA damage. 4. Certain types of cancer are caused by viruses.
The mosaic effect of X inactivation in calico cat fur can be observed in
a. skin color only. b. hair color only. c. fingernails only. d. the location of sweat glands. e. all its tissues.
Which of these actions describes secondary growth?
A. growth in height B. development of fruit C. development of leaves and flowers D. development of wood and bark
Which of the following is NOT true of cell membranes?
A. They are composed of four carbohydrate layers. B. They contain protein molecules. C. They regulate movement of some substances into and out of the cell. D. They contain phospholipids.