To initiate a signal transduction pathway, a signal binds to a receptor protein usually located in the
A) nucleus.
B) plasma membrane.
C) ER.
D) cytoplasm.
Answer: B
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The area in the figure marked “A” is likely to
become a. vacuoles. b. Golgi bodies. c. mitochondria. d. chloroplasts in some cells. e. endoplasmic reticulum.
Which of the following statements is TRUE?
a. Once a person reaches maturity, cell division stops except to repair wounds. b. Cell division in an adult signifies cancer. c. Some specific cells throughout the body retain the ability to divide and replace themselves. d. Mitosis always produces haploid cells. e. All cells retain the ability to divide even after the organism reaches maturity.
Which one of the following sexually transmitted diseases is currently the most prevalent in the United States?
A) gonorrhea B) syphilis C) AIDS D) genital warts E) chlamydia
In 2000, when then-President Clinton along with Francis Collins of the Human Genome Project and Craig Venter of Celera announced the completion of a "draft" of the human genome, the event did not, in fact, represent true completion because most
of what type of sequences were not included?