An atom of potassium that has 19 protons and 18 electrons. Does this atom have a positive or negative net electric charge?
Answer: Positive
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The first cells on Earth gained energy from ________
a. methane and hydrogen sulfide b. photosynthesis using a C3 pathway c. consuming other cells d. absorbing short-wave UV radiation from sunlight
The deer population in many parts of the northeastern United States is perceived to be out of control. What solutions to this problem would you deem to be the most feasible? (Select and defend one or more of the solutions listed below.) a. Increasing human predation by increasing the length of hunting season . b. Lowering the birth rate of the deer by putting out feed laced with
birth-controlchemicals. c. Increasing the rate of predation by re-introducing natural predators such asbobcats and mountain lions. d. There is no absolute correct answer to this question since each choice, althoughit will impact the deer population, has its pros and cons.
Which subatomic particles have a negative charge?
a. neutrons only b. protons only c. electrons only d. both neutrons and protons e. both protons and electrons
Why are cDNA libraries desirable for the expression of eukaryotic genes in prokaryotes? What will be an ideal response?