Select the best response to the question.
?What is the best way to prevent contamination when drawing blood cultures?
A) performing hand hygiene prior to the venipuncture
B) properly preparing the skin prior to the venipuncture
C) wearing gloves when performing the venipuncture
D)applying a tourniquet before performing the venipuncture
B
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A closed-circular DNA in its relaxed form has a linking number (Lk) of 500 . What will happen to the linking number of this molecule if the DNA is denatured by heat?
A. Lk will increase. B. Lk will decrease. C. Lk will stay the same. D. Lk becomes undefined. E. None of these choices is correct.
Which is not a characteristic of fungi?
A. Heterotrophic nutrition B. Photosynthetic C. Presence of cell walls D. Include single-cell and filamentous forms
Alternative forms of a single gene are called ______.
Fill in the blank(s) with the appropriate word(s).
In the following chemical reaction, which molecule is the disaccharide? glucose + fructose ? sucrose + water
A) water B) sucrose C) fructose D) glucose