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Exam 11: How Genes Are Controlled

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Question 21

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In an operon,the ______ acts as an on/off switch.

A) operator
B) promoter
C) activator
D) repressor

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Question 22

Multiple Choice

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Homeotic genes ______.

A) have very different sequences in plant cells as compared to animal cells
B) are an example of convergent evolution
C) are evidence of the common ancestry of eukaryotic organisms
D) regulate gene expression in both prokaryotic and eukaryotic cells

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Question 23

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Please read the paragraph below to answer the following question(s) . Jim has become particularly interested in the genetic basis of cancer and has spent considerable time reading published papers about oncogenes. He learned that as early as 1972 researchers suggested that mutations in proto-oncogenes caused by carcinogens can convert them to oncogenes. He asked you to answer a couple of questions about this because he did not have the biology background to totally understand. -Jim learned that viruses can sometimes cause cancer and wants to know why.You tell him that ______.

Male tortoiseshell cats ______.

Introns are ______.

At one point,you were just an undifferentiated,single cell.You are now made of many cells; some of these cells function as liver cells,some as muscle cells,some as red blood cells,while others play different roles.What name is given to the process that is responsible for this?

The figure below illustrates ______.

Reproductive cloning involves

Possible uses of reproductive cloning include ______.

What name is given to a gene that causes cancer?

______ is(are) responsible for more cancers than any other carcinogen.

While examining a human cell that functions normally,you determine that it has 45 functional chromosomes and one chromosome that is almost completely inactive. You immediately decide that it is very likely that this cell ______.

Bacterial RNA polymerase binds to the ______.

The process by which genotype becomes expressed as phenotype is ______.

Repressors act by blocking the binding of _____ to the operator.

What is the first level of control of eukaryotic gene transcription?

More people die of ______ cancer than of any other cancer.

In bacteria,what name is given to a cluster of genes with related functions,along with their DNA control sequences?

The lac operon is shown in the accompanying figure.Answer the following question after reviewing the figure.The lac operon is usually in the ______ position and is activated by ______.

Which risk factors are associated with cancer of the colon and rectum?