Fertilization of an ovum normally occurs in the
A. cervix.
B. ovary.
C. vagina.
D. uterus.
E. oviduct.
Answer: E
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Which of the following is not a mechanism by which viruses cause cancer?
A. An expression of viral proteins results in abnormal expression of genes that regulate cell growth and reproduction. B. They carry a cancer-causing gene into the cell. C. They encode proteins that bind to and inactivate host cell proteins known as tumor suppressor proteins. D. They produce defective interfering particles.
The characteristic common to all lipids is their
A. solubility in organic solvents. B. hydrophilic nature. C. large size. D. hydrophobic nature. E. solubility in organic solvents AND hydrophobic nature.
Microbes are energetically powerful!
What will be an ideal response?
Mucous membranes are quite thin and fragile. How can such delicate tissue provide defense against microbial invaders?
A) the mucus secreted by the mucous membrane physically traps microbes. B) the mucus contains a variety of antimicrobial chemicals and molecules. C) both the mucus and the outer layer of cells are shed frequently. D) the mucus is a physical trap that contains a variety of antimicrobial chemicals. E) the mucus physically traps microbes, contains a variety of antimicrobial chemicals, and is shed constantly, along with the outermost layer of cells.