After the decolorizer has been added, gram-positive organisms are stained ________ and gram-negative organisms are stained ________.

A. purple; pink
B. pink; pink
C. purple; purple
D. purple; colorless


Answer: D

Biology & Microbiology

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In humans, the sickle-cell trait is caused by a single defective allele, but sickle-cell disease only occurs in individuals that are homozygous for the sickle-cell allele. A man and woman each carry the trait, but do not have sickle-cell disease. What is the probability that their first two children will both have sickle-cell disease?  

A.  1/16 B.  1/8 C.  1/4 D.  3/8 E.  1/2 Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about monohybrid crosses? About determining the probability of two independent events? 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?  

Biology & Microbiology

You discover an organism that has a nucleus but no mitochondria. This organism could be a

a. euglenoid. b. diplomonad. c. kinetoplastid. d. ciliate. e. dinoflagellate.

Biology & Microbiology

Enzymes that are always present, regardless of the amount of substrate, are ________.

A. regulated enzymes B. endoenzymes C. exoenzymes D. constitutive enzymes E. apoenzymes

Biology & Microbiology

What is one difference between ubiquinones and cytochromes?

a. Ubiquinones can only be reduced; cytochromes can only be oxidized. b. Ubiquinones are not made of protein; cytochromes are. c. Ubiquinones cannot carry electrons; cytochromes can. d. Ubiquinones can only be oxidized; cytochromes can only be reduced.

Biology & Microbiology