Explain why some viruses contain enzymes within the virion and others do not. Use specific examples to support your answer
What will be an ideal response?
Answer: In the example of retroviruses, the reverse transcriptase enzyme, which is critical for its replication is found within the virion itself. Bacteriophages contain lysozyme in the capsid to penetration the peptidoglycan cell wall. However, many other viruses do not carry enzymes simply because they use the host's cellular machinery to translate enzymes that they require.
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What does it mean when we say the genetic code is redundant?
A) A single codon can specify the addition of more than one amino acid. B) The genetic code is different for different domains of organisms. C) The genetic code is universal (the same for all organisms). D) More than one codon can specify the addition of the same amino acid.
Which of the following lists the correct pathway of blood through the circulatory system?
A) Left ventricle, aorta, systemic circuit, vena cava, right atrium, right ventricle, lungs, left atrium B) Right ventricle, aorta, systemic circuit, vena cava, left atrium, left ventricle, lungs, right atrium C) Right ventricle, vena cava, systemic circuit, aorta, left atrium, left ventricle, lungs, right atrium D) Left ventricle, vena cava, systemic circuit, aorta, right atrium, right ventricle, lungs, left atrium
Which base pairs with adenine in a DNA molecule?
a. adenosine b. cytosine c. thymine d. guanine e. uracil
Which cells complete their maturation in the bone marrow?
A. T cell B. B cell C. monocyte D. mast cell E. natural killer cell