A DNA sequence that can be read the same backward and forward is called a(n)
A) repetitive code.
B) palindrome.
C) plasmid sequence.
D) DNA fingerprint.
E) exon.
B
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What is the purpose of synthesizing a negative strand RNA in positive stranded ssRNA viruses?
A) enable rolling circle amplification of the genome, which requires both strands of RNA B) enable transcription of genes occurring on both the negative and positive strands of the genome, such as overlapping genes C) proofreading of the genome to minimize mutations generated by the polymerase being passed onto virion progeny D) to serve as the complementary template sequence in genome amplification of the positive strand
Select the correct statement regarding the temperature response of the immune system.
A. When macrophages encounter invading cells, they release immunoglobulin-1, which is carried to the brain by the circulatory system. B. Interleukin-1 is a pyrogen, which can cause the neurons in the hypothalamus to raise the body's temperature, producing a fever. C. Fever contributes to the body's defenses by stimulating hyperhidrosis and causing the liver and spleen to store magnesium. D. Fevers above 99° F are often fatal.
Which of the following is TRUE when the lung volume is equal to the functional residual capacity?
A) Intra-alveolar pressure is less than intrapleural pressure. B) Intra-alveolar pressure is greater than atmospheric pressure. C) The elastic recoil of the lungs is balanced by the elastic recoil of the chest wall. D) Intrapleural pressure is zero. E) Intra-alveolar pressure is less than atmospheric pressure.
Which of the following is NOT a property of water?
a. It is a good solvent. b. It is denser when frozen than when liquid. c. It is cohesive. d. It can be found as a solid, liquid, or gas.