The first task you are assigned in your summer laboratory job is to prepare a concentrated NaOH stock solution. The molecular weight of NaOH is 40
How many grams of solid NaOH will you need to weigh out to obtain a 500 mL solution that has a concentration of 10 M?
(a) 800 g
(b) 200 g
(c) 400 g
(d) 160 g
(b)
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Sometimes atoms gain or lose particles. The loss of which of the following would result in a change of overall electrical charge?
A. protons or electrons B. protons only C. electrons only D. neutron only E. protons or neutrons F. neutrons or electrons
Evolutionary history includes mass extinctions that are characterized by the sudden disappearance of a wide variety of species. What is another important consequence of mass extinctions?
a. Mass extinctions create climate changes that lead to further extinctions. b. The number of groups of organisms tends to drop following a mass extinction and then levels off. c. Species remaining after a mass extinction are poorly adapted to their environment. d. Following a mass extinction, there is always a burst of life's diversity. c. Mass extinctions are always followed by a catastrophic event.
The study of the full protein sets that genomes encode is ________
A) proteomics B) genomics C) metagenomics D) systems biology
Which of the following are present in ALL virions?
a. Ribosomes, nucleic acids, capsid, protomers b. DNA, capsomeres, capsid, protomers, envelope c. Capsomeres, nucleic acids, ribosomes, protomers, envelope d. Nucleic acids, capsomeres, capsid, protomers e. RNA, capsomeres, capsid, protomers, envelope