Nodules found on the roots of some plants are involved in supplying which element for the plant?
a. aluminum
b. boron
c. magnesium
d. nitrogen
e. chlorine
d
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A scientist has been growing a bacterial strain for some time in culture media containing very few nutrients. The cells are growing slowly, so she enriches the media with amino acids and carbohydrates. To her dismay, instead of growing faster and to higher densities, the bacteria begin to die. What has caused this strange result?
A. a prophage switched from the lysogenic cycle to the lytic cyle B. a prophage switched from the lytic cycle to the lysogenic cycle C. the bacteria are infected with a temperate phage D. the bacteria are infected with a virulent phage, and has switched from the lysogenic cycle to the lytic cycle E. the bacteria are infected with a temperate phage, and has switched from the lysogenic cycle to the lytic cycle
Animals exchange heat with their environment by which of the following processes EXCEPT?
a. conduction b. radiation c. evaporation d. convection e. thermoregulation
In a replicating DNA molecule, the region in which parental strands are separating and new strands are being synthesized is called a:
A. Okazaki fragment. B. primer. C. replication fork. D. heteroduplex.
Which microscope uses visible light?
A) confocal microscope B) differential interference contrast microscope C) fluorescence microscope D) scanning acoustic microscope E) scanning electron microscope