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Multiple Choice Quiz
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1

Humans and pufferfish have a similar number of genes, yet the human genome is approximately nine times larger than the pufferfish genome. In what form is much of this extra DNA?
A)introns
B)exons
C)retrotransposons
D)RNA
2

Genome comparisons have suggested that mouse DNA has mutated about twice as fast as human DNA. What is a possible explanation for this discrepancy?
A)Mice are much smaller than humans.
B)Mice live in much less sanitary conditions than humans and are therefore exposed to a wider range of mutation-causing substances.
C)Mice have a smaller genome size.
D)Mice have a much shorter generation time.
3

How many pairs of chromosomes do chimpanzees carry?
A)23
B)46
C)24
D)48
4

Why was the genome of the protist P. falciparum difficult to sequence?
A)This protist has a large genome.
B)This organism hides inside red blood cells, making it difficult to obtain enough DNA for the sequencing project.
C)The apicoplast structures in this protist inhibit sequencing reactions.
D)The genome contains a high proportion of adenine and thymine.
5

All of the following are believed to contribute to genomic diversity among various species, except
A)gene duplication.
B)gene transcription.
C)lateral gene transfer.
D)chromosomal rearrangements.
6

What is the fate of most duplicated genes?
A)gene inactivation.
B)gain of a novel function through subsequent mutation
C)they are transferred to a new organism using lateral gene transfer
D)they become orthologs
7

Which of the following best describes pseudogenes?
A)two functional genes within an organism that arose from the duplication of one gene
B)genes that share the same ancestral sequence, but are found in different organisms
C)sequences of DNA that are very similar to functional genes, but do not produce a functional product
D)sequences of DNA that are very similar to inactive genes, but do produce a functional product
8

The Tbx5 gene is known to play a role in which process?
A)notochord development
B)limb formation
C)eye formation
D)sexual reproduction
9

Which of the following organisms is not considered to be a model genetic system?
A)mice
B)fruit flies
C)humans
D)yeast
10

Which of the following statements about Pax6 is false?
A)Pax6 has a similar function in mice and flies.
B)Pax6 is involved in eyespot formation in ribbon worms.
C)Pax6 is required for eye formation in Drosophila.
D)Pax6 is required for eyespot formation in planaria.







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