Regular use of antibacterial cleaning products
a. Prevents occurrence of infections.
b. Is necessary for good health.
c. Promotes survival of bacteria that are resistant.
d. Prevents bacteria from growing.
e. Prevents occurrence of infections, Is necessary for good health, and Prevents bacteria from growing
Ans: c. Promotes survival of bacteria that are resistant.
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Which of the following statements explains why scientific theories, like the theory of evolution, hold more weight than an everyday theory?
a. Scientific theories are made my scientists that can be trusted more than other people. b. Scientific theories are based on scientific evidence, while an everyday theory is a guess. c. Scientific theories and everyday theories are the same. d. Scientific theories do not hold the same weight as an everyday theory.
Which of the following statements is false?
a Checkpoint gene products that inhibit mitosis are called proto-oncogenes. b. Metastasis is the invasion of cancer cells into normal tissue. c. Malignant tumors differ from benign tumors in that their cells migrate. d. Cancer cells have lost the ability to stop dividing. e. The parent cell that started a cancer may have undergone a checkpoint gene mutation
Which of the following must exist in a population before natural selection can act upon that population?
A. variation among individuals in reproductive success B. genetic variation among individuals C. sexual reproduction D. Three of the responses are correct. E. Two of the responses are correct.
Which statement is not true about chronic persistent viral infections?
A) May involve integration of the virus into the host cell DNA to form a provirus. B) May involve periods of flare-up where the virus is actively replicating alternating with periods of dormancy. C) Small numbers of virions may be produced and released from host cells during the quiet periods. D) The immune system fails to clear the infection. E) A period of quiet infection where the host is asymptomatic is followed by a period of active viral replication.