Hydrogen bonds
1.occur between non-polar molecules or groups.
2.are as strong as covalent bonds.
3.occur between polar molecules or groups.
4.never occur in water.
3
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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 term would be the best synonym for the word nutrient?
A. Minerals B. To love C. Food D. Genetic trait
Quaternary ammonia compounds act against microbes by
A) Dissolving membrane lipids B) Denaturing proteins and disrupting cell membranes C) Oxidizing cellular constituents D) Precipitate cell proteins
Which are examples of advantages that different species might have due to living in a group? (Check all that apply.)
A. A flamingo in a large flock may have trouble competing for food. B. Wolves in a pack can take down larger prey than those alone. C. Because of their social nature, diseases like rabies can spread quickly through a bat colony. D. Zebras in a herd have added protection from predators. E. A colony of termites can build mounds over 20 feet high, with elaborate tunnels and ventilation systems.