Which of the following statements is true?
A) Endospores are for reproduction.
B) Endospores allow a cell to survive environmental changes.
C) Endospores are easily stained in a Gram stain.
D) A cell produces one endospore and keeps growing.
E) A cell can produce many endospores.
Ans: B) Endospores allow a cell to survive environmental changes.
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Humus often enhances the water and nutrient-retaining properties of topsoil. Which of the following might increase the humus content of a soil? Check all that apply.
_____ mushroom compost _____ leaf litter _____ ground limestone _____ phosphate fertilizer _____ fish meal Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about humus? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Positional cloning depends on knowing what?
A) the function of a gene B) the expression pattern of a gene C) the map location of markers that are linked to a gene D) the sequence of a gene.
Introduction of previously nonexistent genes into a population may be accomplished by
a. nonrandom mating. b. mutation. c. sexual recombination. d. the founder effect. e. birth.
The scientist who introduced a vaccination procedure for smallpox was
A. Hooke B. Jenner C. Pasteur D. Koch E. Lister