Quiz 6: Points 15
1. Viruses are characterized by all of the following except
a. being found in every organism investigated so far.
b. being specific to the hosts they infect.
c. being capable of independent reproduction.
d. having either a helical or isometric structure.
e. being acellular.
2. Most viruses form a capsid around their nucleic acid core. This capsid is
composed of
a. protein.
b. monosaccharide.
c. antigen.
d. glycoprotein.
e. lipoprotein.
3. The following is not caused by Virus
A. Hanta virus B.SARS C. Ebola fever D. Leprosy E. Influenza
4. A phylogenetic analysis of HIV suggests
a. a single origin of HIV from primates, b. multiple origins of HIV from different
primates species, c. multiple origins of HIV from a single primate species d. that
SIV originated from HIV
5. A paraphyletic group:
a. includes an ancestor and all of its descendants, b. an ancestor and some of its
descendants, c. descendants of more than one common ancestor, d. all of the above
6. Sieve tubes and Sieve elements
a. are homoplastic because they have different function, b. are homologous
because they have similar function, c. are homoplastic because they have common
ancestor was single-celled, d. are structures involved in transport within animals
7. A taxonomic group that contains a common ancestor, but leaves out a
descendant group
a.is paraphyletic, b. is monophyletic, c. is polyphyletic d. is a good cladistic group
8. 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 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 than humans, d. Mice have shorter
generation time.
9. Chimp and Human DNA is close to 99% similar, morphological differences
a. must be largely to gene expression, b. must be due exclusively environmental
differences, c. cannot be explained with current genetic theory, d. are caused by
random effects during development
10. An herbicide that targets the chloroplast might be effective against malaria
because
a. Plasmodium needs a functional apicoplast, b. the main vector for malaria is a
plant, c. mosquitoes require plant leaves for food, d. none of the above
11. In general, as genome size increases there is
a. a proportional increase in the number of genes, b. a proportional decrease in the
number of genes, c. an increase in the amount of DNA, d. a decrease in the amount
of DNA
12. Heterochrony is a. the alteration of the spatial pattern of gene expression b. a
change in the relative position of a body part, c. a change in a signaling pathway, d.
a change in the relative timing of developmental events
13. Homeosis
a. refers to a maintained and unchanging genetic environment, b. is a temporal
change in gene expression, c. is a spatial change in gene expression, d. is not an
important genetic mechanism in development
14. The Brachyury gene in vertebrates and theAp3 gene in flowering plants
A are examples of Hox genes, b. are examples of co-opting a gene for a new
function, c. are homologues for determining the body plan of eukaryotes, d. help
regulate the formation of a photoreceptor organ
15. Retroviruses have __________ kind of enzyme
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