Discuss the difference between covalent, ionic, and hydrogen bonds.
What will be an ideal response?
Covalent bonds involve sharing electrons between atoms. Ionic bonds occur when oppositely charged ions are attracted to each other. Hydrogen bonds occur when polar molecules are attracted by opposite partial charges on different molecules.
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Genetic recombination can occur ____
a. during DNA replication b. during asexual reproduction c. during mitosis d. from an Hfr X F- conjugation e. from an F+ X F- conjugation
Which of the following is an end product of glycolysis?
a. CO2 b. ATP c. NAD+ d. FADH2 e. acetyl CoA
People who wear contact lenses or glasses have a defect in the
A) length of the eyeball. B) iris. C) blind spot. D) cone cells. E) rod cells.
You are earning your Ph.D. in marine biology, studying the microbial ocean community. This year, you are shocked to discover that one of your study sites has become contaminated due to an industrial waste water pipe. This dumping is drastically raising the temperature and lowering the salinity of the water. What do you expect to find in your survey of the ecosystem, and what might you find in a survey years from now?
A. The individuals will turn on genes to adapt to these changes, and the populations will end up largely the same this year and following years. B. Most species will be wiped out this year, and it will take millions of years for new species to evolve-until then the site will be devoid of life. C. Many species will have decreased or disappeared from this site, but later some species may increase in population if they acquire adaptive mutations. Also you may see some new species expand into the site. D. Most species will be wiped out this year, and in subsequent years even fewer will remain.