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TLS Online TPP Program

#Question id: 1534

Cadherin proteins help animal cells stick (adhere) to each other. Choose which statement about cadherin in cancer cells that are metastasizing (spreading) throughout a patient's body is most likely correct.

#Unit 4. Cell Communication and Cell Signaling

  1. Cadherin proteins in metastasizing cancer cells are likely to have mutations that make them less "sticky."

  2. Cadherin proteins in metastasizing cancer cells are likely to have mutations that make them more "sticky."

  3. Mutations in cadherin proteins are unlikely to affect the metastasizing of cancer cells.

  4. Mutations in cadherin proteins accumulate at a constant rate that can be measured by a molecular clock.

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TLS Online TPP Program

#Question id: 23883

#Unit 13. Methods in Biology

A paleontologist has recovered a bit of tissue from the 400-year-old preserved skin of an extinct dodo (a bird). The researcher would like to compare a specific region of the DNA from the sample with DNA from living birds. Which of the following would be most useful for increasing the amount of dodo DNA available for testing?
TLS Online TPP Program

#Question id: 23884

#Unit 13. Methods in Biology

Expression of a cloned eukaryotic gene in a bacterial cell involves many challenges. The use of mRNA and reverse transcriptase is part of a strategy to solve the problem of
TLS Online TPP Program

#Question id: 23885

#Unit 13. Methods in Biology

DNA technology has many medical applications. Which of the following is not done routinely at present?
TLS Online TPP Program

#Question id: 23886

#Unit 13. Methods in Biology

In recombinant DNA methods, the term vector can refer to
TLS Online TPP Program

#Question id: 23887

#Unit 13. Methods in Biology

Which of the following sequences in double-stranded DNA is most likely to be recognized as a cutting site for a restriction enzyme? 
TLS Online TPP Program

#Question id: 23888

#Unit 13. Methods in Biology

A recessive allele usually results from a mutation that
a. disrupts expression of the gene.
b. alters the structure of the encoded protein leading to gain of function.
c. alters the structure of the encoded protein leading to loss of function.
d. increases the activity of the encoded protein.