Which of the following could be classified as habituation?

A) You enter a room and hear a fan motor. After a period of time, you are no longer aware of the motorʹs noise.

B) You hear a horn while driving your car. You step on the brakes but notice the sound came from a side street. You resume your previous speed.

C) One morning you awake to a beep-beep-beep from a garbage truck working on a new early morning schedule. The next week the garbage truck arrives at the same time and makes the same noise, but does not wake you up.

#Question id: 2810

#Unit 2. Cellular Organization

Which of the following steps is required to generate a knockout mouse?

a. microinjection of DNA into the pronucleus of a fertilized mouse egg

b. introduction of DNA into mouse embryonic stem cells

c. selection for cells containing the gene targeted insertion

d. expression of Cre protein during embryonic development

#Question id: 2811

#Unit 2. Cellular Organization

RNA interference is a method for inhibiting the function of specific genes using

a. single-stranded DNA.                     

b. double-stranded DNA.

c. single-stranded RNA.                     

d. double-stranded RNA.

#Question id: 2812

#Unit 2. Cellular Organization

Which of the following statements is (are) true of the human genome?

a. 1.5 percent of the genome corresponds to protein coding sequences.

b. The median length of an intron is 10 kb.

c. 10 percent of the genome is transcribed into pre mRNA precursors.

d. Most human exons contain 500–1000 base pairs.

#Question id: 2813

#Unit 2. Cellular Organization

DNA fingerprinting is a technique based on differences in the

a. length of introns.   

 b. number of tandem copies of a simple sequence repeat.

c. number of tandem ribosomal RNA genes.

d. size of protein coding genes.

#Question id: 2814

#Unit 2. Cellular Organization

LINES (long interspersed elements)

#Question id: 2815

#Unit 2. Cellular Organization

Telomerase

a. extends DNA strands during DNA synthesis.

b. has reverse transcriptase activity.

c. is a protein-RNA complex.

d. replicates repetitious DNA located at the centromere.