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Exam 10: The Structure and Function of Dna

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Question 21

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

A) the genetic code arose relatively late in the history of life on Earth
B) DNA replication is error-free
C) all life shares a common ancestry
D) bacterial cells arose earlier than eukaryotic cells

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Question 22

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What is the ultimate source of all diversity?

A) natural selection
B) sexual recombination
C) meiosis
D) mutation

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Question 23

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Peptide bonds form between ________.

If guanine makes up 60% of the bases in a DNA double helix, what percent of the bases is adenine?

What cellular structure facilitates the process of translation?

The CORRECT sequence of events that occurs during transcription is ________.

Translation converts the information stored in ________ to ________.

Which of the following enzymes is responsible for RNA synthesis?

Scenario 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 observe the graph shown here. -Assume that you want to take a sample of viruses so that you could use them to infect the most bacteria. At what point on the graph should you take your sample from if you want to achieve this goal?

Plant viruses ________.

DNA and RNA are polymers composed of ________ monomers.

Evidence for the spiral nature of DNA came from ________.

What protects mRNA from attack by cellular enzymes?

Consider the following figure. It illustrates that a single amino acid substitution in the hemoglobin gene ________.

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

A(n) ________ is to bacteria as a ________ is to animal cells.

DNA contains the nitrogenous base ________ instead of ________, which is found only in RNA.

If a strand of DNA has the sequence GACTTA, transcription will result in a(n) ________.

As an experiment, you infect bacteria with an unknown virus to see how the virus affects the bacteria. After a few days, you notice that the bacterial population is growing normally and that the cells appear healthy. Assuming that the infection occurred successfully, what can you conclude from your observations?

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