Chrysanthemums are short-day plants, requiring a night length of longer than 12 hours to flower
Under which of the following conditions should chrysanthemums flower?
1: Night length 14 hours, day length 10 hours
2: Night length 10 hours, day length 14 hours
3: Night length 14 hours, day length 10 hours; night interrupted in the middle by an intense
red flash
4: Night length 10 hours, day length 14 hours; day interrupted in the middle by half an hour
of darkness
a. only 1
b. only 2
c. both 1 and 3
d. both 2 and 4
e. 2, 3, and 4
A
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A. poly-A polymerase. B. mRNA. C. tRNA. D. the ribosome. E. the template strand of DNA.
The portion of the brain that receives sensory information from the skin and muscles is the
A. basal nuclei. B. primary somatosensory area C. processing center. D. auditory association area.
Although exceptions do exist, which is a distinctively amphibian trait?
A) Juveniles have gills, and adults have lungs. B) Respiration occurs through the skin. C) Skin is smooth with no scales, feathers, or hair. D) All of these are distinctive amphibian traits.
Scientists disagree about how many species are currently on earth for all of the following reasons EXCEPT:
a) there is controversy over whether natural selection is the only mode of speciation. b) there is not one true definition of species. c) at any one time, there are few populations in the process of speciation. d) there are many organisms on Earth that have yet to be discovered. e) different scientists use different techniques to estimate the actual number of species from the known number of species.