Because cytotoxic T cells can recognize viral proteins, they can destroy these infected cells. This is particularly important to individuals with certain kinds of cancers because
A) destroying the infected cells can help slow the spread of the infected cells.
B) destroying the infected cells can help quicken the spread of the infected cells.
C) destroying the infected cells can help prevent future infections of other viruses.
Answer: A
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A scientist has been growing a bacterial strain for some time in culture media containing very few nutrients. The cells are growing slowly, so she enriches the media with amino acids and carbohydrates. To her dismay, instead of growing faster and to higher densities, the bacteria begin to die. What has caused this strange result?
A. a prophage switched from the lysogenic cycle to the lytic cyle B. a prophage switched from the lytic cycle to the lysogenic cycle C. the bacteria are infected with a temperate phage D. the bacteria are infected with a virulent phage, and has switched from the lysogenic cycle to the lytic cycle E. the bacteria are infected with a temperate phage, and has switched from the lysogenic cycle to the lytic cycle
Which step is NOT involved in the fertilization of angiosperm flowers?
A. Pollen is transported to a stigma of a flower. B. When pollen reaches the stigma of a flower, it begins to grow a pollen tube that pierces the style. C. The style of the pistil contracts to bring the sperm closer to the embryo sac. D. The pollen tube grows until it reaches the ovule in the ovary. E. Double fertilization produces an embryo and the endosperm.
The epipelagic refers to the location of pelagic animals that can extend down to:
a. 10 m. b. 20 m. c. 100 m. d. 200 m. e. 1000 m.
Which of the following would NOT normally be found as a component of a cell's nucleic acids?
A) adenine deoxyribonucleotides B) thymine deoxyribonucleotides C) uracil deoxyribonucleotides D) cytosine ribonucleotides E) adenine ribonucleotides