Which reservoir holds the largest volume of Earth's freshwater?
A. Groundwater
B. Rivers
C. Lakes
D. Atmosphere
E. Polar ice
Answer: E
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Given the plant species' name Claytonia virginica, what might you surmise about it?
a. It was named in honor of somebody named Clayton and was found it in Virginia. b. It grows on clay soils in virgin forests. c. It was described and named by someone named Clayton d. It is related to Ostrya virginiana. e. Absolutely nothing.
The major cause of male infertility is ________________
A. varicocele D. semen disorders B. undescended testicles E. obstructions C. testicular failure
The restriction enzymes of bacteria protect the bacteria from successful attack by bacteriophages, whose genomes can be degraded by the restriction enzymes
The bacterial genomes are not vulnerable to these restriction enzymes because bacterial DNA is methylated. This situation selects for bacteriophages whose genomes are also methylated. As new strains of resistant bacteriophages become more prevalent, this in turn selects for bacteria whose genomes are not methylated and whose restriction enzymes instead degrade methylated DNA. The outcome of the conflict between bacteria and bacteriophage at any point in time results from _____. A) frequency-dependent selection B) evolutionary imbalance C) heterozygote advantage D) neutral variation
Biofilms provide pathogens with an adhesion mechanism and aid in resistance to antimicrobial agents
Indicate whether the statement is true or false