Cocklebur will not flower if exposed to 8 hours of dark and 16 hours of light. It will flower if exposed to 16 hours of dark and 8 hours of light. However, if the 16 hours of dark is interrupted with a brief period of light, the cocklebur will not flower. Which of the following will trigger cocklebur to flower?
A. short dark periods
B. short light periods
C. long dark periods
D. None of the answer choices is correct.
E. long light periods
C. long dark periods
You might also like to view...
Starting with glycolysis, lactic acid and ethanol fermentation generate only two ATP per glucose molecule. The remaining chemical energy from the glucose is found primarily in:
A. GTP. B. NADH. C. FADH2. D. lactic acid and ethanol. E. CO2.
You are working in a lab that studies tobacco mosaic virus (TMV). You wish to perform follow up experiments to the Fraenkel-Conrat/Singer experiments
You use the Holmes ribgrass (HR) strain of TMV that they used, which produces streaks along the veins and contains histidine and methionine in the TMV capsid protein. You also use a second TMV strain that you've isolated, called Purp, that causes purple lesions on the leaves, and lacks histidine and methionine in the TMV capsid protein. If you use Purp RNA and HR proteins to create reconstituted viruses, what lesions do you expect will form, and what will the amino acid composition of the capsid protein be? A. Purple lesions, histidine and methionine in the capsid protein B. Purple lesions, no histidine and methionine in the capsid protein C. Streaks on the veins, no histidine and methionine in the capsid protein D. Streaks on the veins, histidine and methionine in the capsid protein
Which of the following may help to explain why there are no populations in which newts produce so much toxin that they kill all snakes, but there are several populations where snakes are completely unaffected by the toxicity of newts?
A. a change in a single amino acid can result in resistance against the toxin B. a series of mutations are required to make newts more toxic C. snakes can learn to avoid newts D. a and b are correct
Bronchitis can be easily acquired by individuals with immunodeficiency disorders. In these situations, bronchitis is an example of
A) a virus. B) an opportunistic infection. C) adaptive immunity. D) an autoimmune disorder.