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Exam 10: The Structure and Function of DNA

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Question 21

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Please read the following scenario to answer the following questions. While working with cultured mouse cells, a researcher unknowingly treated the cells with a mutagen that causes the deletion or insertion of individual nucleotides in DNA. Subsequently, the researcher isolated and cultured a single cell from this group and noticed that the progeny of this cell were not producing a certain protein and that this affected their survival. -The mutation would be most harmful to the cells if it resulted in ________.

A) a single nucleotide insertion near the start of the coding sequence
B) a single nucleotide deletion near the end of the coding sequence
C) a single nucleotide in the middle of an intron
D) deletion of a triplet near the middle of the gene

E) All of the above
F) B) and D)

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Question 22

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Plant viruses ________.

A) often use RNA, rather than DNA, as their genetic material
B) benefit plants, rather than causing disease
C) cause diseases that can be easily cured
D) do not exist, as viruses attack only animals

E) None of the above
F) C) and D)

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Question 23

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If adenine makes up 20% of the bases in a DNA double helix,what percent of the bases is guanine?

Scenario Questions Please read the following scenario to answer the following questions If you were asked to study the pattern of bacterial growth (increase in numbers over time) during an infection, you would find that numbers of bacteria increase exponentially up to a certain point. Assume that you have been asked to interpret the growth of bacteriophages. You infect the host bacteria and measure the increase of phages over a defined period of time. You plot the results and get the graph shown here. -At what point on the graph are the viruses increasing in number the fastest?

DNA replication ________.

Transcription is the ________.

Scenario Questions Please read the following scenario to answer the following questions If you were asked to study the pattern of bacterial growth (increase in numbers over time) during an infection, you would find that numbers of bacteria increase exponentially up to a certain point. Assume that you have been asked to interpret the growth of bacteriophages. You infect the host bacteria and measure the increase of phages over a defined period of time. You plot the results and get the graph shown here. -Once viruses are detected,the number of viruses increases rapidly.This is because ________.

The figure below shows the flow of genetic information in a eukaryotic cell.The transfer of information from DNA into an RNA molecule is known as ________.

The shared genetic code of all life on Earth is evidence that ________.

The absence of a terminator in transcription will result in ________.

What protects mRNA from attack by cellular enzymes?

During translation,what is the CORRECT order of events that occur as an amino acid is added?

Evidence for the spiral nature of DNA came from ________.

After replication,________.

What is the ultimate source of all diversity?

Mad cow disease is caused by

How many nucleotides make up a codon?

Thymine and cytosine differ from adenine and guanine in that ________.

What was a surprising feature about the deadly nature of the 2009 H1N1 influenza virus?

A mutation within a gene that will insert a premature stop codon in mRNA would ________.