Which label designates a female reproductive structure in the accompanying figure?
a. 1
b. 2
c. 5
d. 7
e.8
e
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The evolution of organisms that use oxygen in their respiration was possible only because of the action of a group of bacteria that produced oxygen and changed the Earth's atmosphere from an anoxic one to one rich in oxygen. That group of bacteria was:
A. Cyanobacteria B. spirochaetes C. Proteobacteria D. Staphylococcus E. Actinobacteria
Among which of the following will sexual dimorphism lead to females being larger than
males?
a. among species where males physically fight for access to females b. among species where a male must guard a female to prevent other males from mating with her c. among species where males have to walk long distances to find females but fighting is rare d. Females being larger than males is always beneficial because it leads to higher fecundity.
The genetic information in viruses
is found in the nucleus of the virus. is always DNA. is either DNA or RNA. is always RNA. can be replicated outside of a cell.
When e-cadherin expression ___ this increases invasiveness of tumor cells.
a. increased b. decreased c. stays the same d. none of the above