Unit Test — Unit test

Question 1

Consider the diagram.Which process is represented?

Revolt · Accepted Answer

nondisjunction

Question 2

Many different types of mutations can occur within the body. An individual experiences a mutation that changes a base in a mRNA strand, but during translation the mRNA strand still creates the same protein. Which type of mutation is responsible for the change in the mRNA base?

Revolt · Accepted Answer

silent

Question 3

A mutation causes a sequence of DNA that has the nucleotides TTG to be changed to TCG. The resulting protein has a different sequence of amino acids. Which type of mutation is this?

Revolt · Accepted Answer

missense

Question 4

Which step in transcription occurs first?

Revolt · Accepted Answer

RNA polymerase attaches to the promoter.

Question 5

Fragile X syndrome, characterized by mental retardation, is caused by which chromosomal change?

Revolt · Accepted Answer

insertion

Question 6

Which of the following difference between DNA and RNA allows them to perform their unique functions?

Revolt · Accepted Answer

DNA contains thymine, while RNA contains uracil.

Question 7

Photo 51 is a picture of the structure of DNA that was used to create a model of DNA. Who created the photo?

Revolt · Accepted Answer

Rosalind Franklin

Question 8

Which accurately describes the relationship between cancer risk and exposure to mutagens?

Revolt · Accepted Answer

Cancer risk increases when a person is exposed to mutagens because the risk of DNA mutations increases as well.

Question 9

Which does not occur during translation?

Revolt · Accepted Answer

DNA is transcribed into a complementary strand of mRNA.

Question 10

The structure of DNA resembles a twisted ladder. Which structural components form the rungs of the ladder?

Revolt · Accepted Answer

nitrogenous base pairs

Unit Test — Unit test Answers

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