Most cervical cancers are caused by:
a. herpes virus
b. human papillomavirus
c. hantavirus virus
d. streptococcus
e. staphylococcus
b
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In both lichens and mycorrhizae, what does the fungal partner provide to its photosynthetic partner?
A) carbohydrates B) fixed nitrogen C) antibiotics D) water and minerals E) protection from harmful ultraviolet light
In the bacterial world, a gene located on which of the following would be the LEAST likely to be transferred?
A) R factor B) F+ C) the phage Mu D) the chromosome
Why is a secondary immune response stronger?
A) Body cells are primed to produce antibodies against the pathogen. B) Antibodies produced during the primary response are still present circulating in the blood. C) Body cells develop resistance to the pathogen. D) Effector cells produced during the primary response are still present circulating in the blood. E) Exposure to a previously encountered antigen gives rise not only to effector cells but also to clones of long-lived memory T cells and memory B cells.
Farmers often practice crop rotation to help enrich agricultural fields. Why are beans and other legumes often used in the rotations?
A. Less carbon dioxide. B. Bacteria in legume root nodules are nitrifiers. C. Legumes remove toxins from the soil. D. Legumes enrich the soil by forming heterocysts. E. Beans fix nitrogen.