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This activity contains 55 questions.

Question 1
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In the United States, certain groups of people, such as the elderly, are highly encouraged to get a flu vaccine each year. Why?
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Question 2
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Which one of the following is a list of the four bases contained in DNA?
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Question 3
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Which one of the following lists the chemical components of a nucleotide?
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Question 4
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Monomers for the synthesis of DNA are called _____.
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Question 5
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Which one of the following is uniquely associated with RNA?
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Question 6
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What research technique was most helpful to Watson and Crick in their attempt to determine the structure of DNA?
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Question 7
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A major characteristic of the structure of DNA is that __________.
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Question 8
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The two sugar-phosphate strands with their associated nitrogenous bases of a DNA molecule are joined to each other by __________.
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Question 9
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Which one of the following statements is true about double-stranded DNA?
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Question 10
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The genetic information in DNA is contained in __________.
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Question 11
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Which one of the following statements applies to the Watson-Crick model for DNA?
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Question 12
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One strand of a DNA molecule has the base sequence ATAGGT. The complementary base sequence on the other strand of DNA will be _____.
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Question 13
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DNA replication __________.
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Question 14
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During the replication of DNA molecules, __________.
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Question 15
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Two new strands of DNA grow as bases are added by the enzyme _____.
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Question 16
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A gene is usually __________.
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Question 17
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The number of nucleotide bases on the mRNA that together designate an amino acid is _____; this unit is called a(n) _____.
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Question 18
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Which one of the following statements is true?
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Question 19
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When messenger RNA (mRNA) is being made, the RNA base _____ always pairs with the base _____ in DNA.
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Question 20
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The DNA code is CGT. What is the sequence of nucleotides in the transcribed mRNA?
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Question 21
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During the transcription of a given portion of a DNA molecule __________.
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Question 22
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One strand of a DNA molecule has the following sequence: AGTACAAACTATCCACCGTC. For transcription of this sequence to occur, there would have to be a specific recognition sequence for the RNA polymerase, called a(n) _____, to the left of the DNA sequence indicated.
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Question 23
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Assume that a cell is carrying out its day-to-day activities. At one point, the nucleotides GAT are paired with the nucleotides CUA. This pairing occurred __________.
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Question 24
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A terminator of mRNA synthesis is __________.
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Question 25
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Which one of the following catalyzes the linkage between nucleotides to form mRNA?
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Question 26
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In transcription, __________.
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Question 27
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Genetic information is transferred from the nucleus to the cytoplasm of eukaryotic cells in the form of _____.
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Question 28
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A cell biologist found that two different proteins with different structures were translated from two different mRNAs. These mRNAs, however, were transcribed from the same gene in the cell nucleus. Which mechanism below could best account for this?
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Question 29
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Usually, in transcription of eukaryotic genes __________.
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Question 30
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Which one of the following statements correctly describes mRNA processing in eukaryotes?
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Question 31
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A mutation in a DNA sequence is likely to have no effect on phenotype if the mutation __________.
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Question 32
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In a eukaryotic cell, transcription takes place __________.
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Question 33
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The function of tRNA during protein synthesis is to __________.
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Question 34
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During the process of translation, _____ matches an mRNA codon with the proper amino acid.
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Question 35
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During translation in a eukaryotic cell __________.
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Question 36
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During translation, amino acid chain elongation occurs until __________.
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Question 37
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A virus infects a cell and randomly inserts many short segments of DNA, each containing a stop codon, throughout the organism's chromosomes. This will probably cause __________.
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Question 38
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A sequence of pictures of polypeptide synthesis shows a ribosome holding two transfer RNAs. One tRNA has a polypeptide chain attached to it; the other tRNA has a single amino acid attached to it. What does the next picture show?
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Question 39
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A particular _____ contains the information for making a specific polypeptide, but _____ can be used to make any polypeptide.
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Question 40
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What is the proper order of the following events in the expression of a eukaryotic gene?
1. translation
2. RNA processing
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Question 41
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Which one of the following processes takes place in the nucleus?
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Question 42
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Which summary of protein synthesis is correct?
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Question 43
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Mutations are __________.
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Question 44
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A geneticist found that a particular mutation had no effect on the polypeptide encoded by a gene. This mutation probably involved __________.
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Question 45
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Imagine an error occurring during DNA replication in a cell, so that where there is supposed to be a T in one of the genes, there is instead a G. What effect might this have on the cell?
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Question 46
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Ultraviolet (UV) radiation is damaging because it __________.
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Question 47
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Genetic mutations __________.
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Question 48
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The phage reproductive cycle that kills the bacterial host cell is a _____ cycle.
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Question 49
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A prophage is a(n) __________.
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Question 50
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Why are insects common vectors of plant viruses?
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Question 51
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In enveloped RNA viruses, the viral enzyme that produces copies of the RNA is probably most similar to which eukaryotic enzyme?
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Question 52
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Given the data in Figure 10.29, what would happen if flu vaccines were given at the beginning of summer instead of the start of winter?
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Question 53
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How do retroviruses, such as HIV, differ from other viruses?
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Question 54
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What is a major difference between prions and viruses?
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Question 55
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Which of the following is an "emerging virus" that has a direct impact on human health?
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