Which experimental modification would most effectively help to determine the sequence of reactions and reaction intermediates in the Calvin cycle?
A. Varying the amount of water the cells are exposed to
B. Exposing the cells to 14CO2 for various time intervals
C. Exposing the cells to radiolabeled O2 instead of 14CO2
D. Exposing the cells to alternating periods of light and darkness
Answer: B
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Which statement about rods and cones in the eye is correct?
a. Cones respond to particular wavelengths (colors) of light, while rods perceive light at low intensity without color perception. b. Rods respond to particular wavelengths (colors) of light, while cones perceive light at low intensities without color perception. c. Cones are more sensitive to single photons of light than rods. d. Nocturnal animals have a high concentration of cones and relatively few rods. e. Humans have approximately equal numbers of rods and cones, but the cones are primarily localized in the fovea.
Amish populations in Lancaster County, Pennsylvania have high rates of a rare form of dwarfism. The recessive allele that codes for this disorder is found in 1 of 14 individuals in this Amish population, in contrast to 1 in 1,000 in the general population. In Ohio, an Amish population suffers with higher than normal rates of cystic fibrosis and a host of other genetic diseases so rare that some have not yet been named. What factors have caused such severe genetic problems in these two communities?
What will be an ideal response?
The ________ are fungi that have lost the ability to reproduce sexually.
A. zygomycetes B. ascomycetes C. basidiomycetes D. imperfect fungi
Genetic recombination allows bacterial cells to receive small amounts of ________ from other cells or from the environment.
A) protein B) DNA C) RNA D) cytoplasm