All of the following are characteristics of modern amphibians except:
a. Ten pairs of cranial nerves
b. Separate sexes
c. Smooth moist skin
d. Endothermic
e. Bony skeleton
Ans: d. Endothermic
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two key observations underlying natural selection are that members of a population vary in their ----- and that all species can produce more offspring than the environment can support
Fill in the blank(s) with the appropriate word(s).
In the three domain system of classification,
A. eukaryotes are more similar to the prokaryotes now classified into domain Bacteria than to those now classified into domain Archaea. B. animals and plants are less similar to each other than to the prokaryotes now classified into domain Archaea. C. prokaryotes are classified into two domains, with the organisms in domain Archaea more similar to eukaryotes than to the prokaryotes in the domain Bacteria. D. cladistics alone were used to formulate the new phylogenetic tree of life. E. by the principle of parsimony, it required fewer assumptions to divide the prokaryotes into two domains than it did to put them into a single domain.
What is the main difference between bacterial and eukaryotic transposons?
a. Eukaryotic transposons sometimes transpose using RNA and bacterial transposons do not. b. Eukaryotic transposons carry genes and bacterial transposons do not. c. Bacterial transposons contain inverted repeats and eukaryotic transposons do not. d. Bacterial transposons sometimes transpose using RNA and eukaryotic transposons do not.
You are breeding different varieties of roses in your garden. When you cross a true-breeding yellow "Texas Beauty" rose with a true-breeding "Ruby" red rose, you get all red roses. But when you cross a "Texas Beauty" yellow with the yellow variety "Jealousy," you get a 9:7 ratio of red to yellow flowers! What can you conclude from these results?
A. There is no recessive allele for the red pigment gene. B. There is a mutation in the gene for yellow pigment in the "Jealousy" variety. C. The environment, and not genes, influences pigment in these rose varieties. D. There are epistatic interactions between at least two genes for rose pigment. E. The red allele is dominant to the yellow allele.