Which of the gamete combinations below is most likely to result in a normal embryo which dies because of abnormalities in the placenta?
1.egg / sperm
2.sperm / sperm
3.egg / egg
4.all are equally likely
3
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A researcher is interested in comparing the DNA sequence for the gene encoding myosin between a cheetah (mammal) and a red snapper (fish). Which database would be most helpful to her?
A. GenBank B. Swiss Prot C. PIR (Protein Information Resource) D. GenPept E. PDB (Protein Data Bank)
Which of the following branches of biology examines the form and variety of organisms in their
natural environment?
a. Taxonomy b. Natural history c. Comparative morphology
d. Biogeography e. Geology
Sequence similarity between genes plays an important role in assigning gene function
Indicate whether the statement is true or false
Usually the only epidermal cells with chloroplasts are:
a. stomata.
b. stoma.
c. parenchyma.
d. guard cells.
e. all of these.