Foodborne illness can be prevented by boiling all food (meat and vegetables) prior to consumption.
A) True
B) False
B) False
Feedback: This answer is false, the case study for this exercise describes foodborne illness due to C. perfringens enterotoxin found in boiled sauces, some toxins are “heat stabile”.
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Contact inhibition is best explained by which of the following statements?
a. Contact between neighboring cells triggers reactions leading to inhibition of mitosis. b. As neighboring cells become more tightly packed together, their size is restricted and cytokinesis can no longer occur. c. As cell number increases, the protein kinases they produce compete with neighboring cells, inhibiting mitosis. d. As cell number increases, the level of waste products increase, consequently slowing metabolism leading to mitosis. e. As cell number increases, size restrictions inhibit protein synthesis.
What type of genetic material does the HIV virus carry?
a. Both DNA and RNA b. Proteins c. RNA d. Prions e. DNA
The principal driving force for movement of water into and through the plant shoot is
a. passive transport. b. sunlight. c. root pressure. d. upward pressure as sugar is forced into the roots. e. pumping by the xylem cells.
Aquatic animals that rely on external fertilization for reproduction have a low probability of successful fertilization. Which of the following is a mechanism used to increase the liklihood of successful external fertilization?
A. courtship rituals to synchronize male/female gamete release B. depositing sperm into the female reproductive tract C. production of extremely large number of gametes that are released simultaneously D. containment of sperm within spermatophores