The scientist credited with the discovery of DNA (nuclein) from white blood cells in pus on surgical bandages is

A) Johann Friedrich Meischer.
B) Eduard Zacharias.
C) Fredrick Griffiths.
D) Martha Chase.
E) Oswald Avery.


Answer: A

Biology & Microbiology

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Tetrazolium chloride is used by the seed industry to indicate

(a) if a seed is undergoing photosynthesis. (b) if seeds are undergoing aerobic respiration. (c) if seeds are alive. (d) both b and c.

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Figure 13.3 provides examples of various types of sequences that can be found in a segment of double-stranded DNA. Which one of the following is most likely to be protein-coding?

A. noncoding RNA B. single-copy gene C. dispersed repeat D. tandem repeat E. simple-sequence repeat

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Cite evidence that suggests that all modern humans arose from one common ancestor located in Africa.

What will be an ideal response?

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Using a six-sided die, what is the probability of rolling either a 5 or a 6?

A) 1/6 × 1/6 = 1/36 B) 1/6 + 1/6 = 1/3 C) 1/6 + 1/6 = 2/3

Biology & Microbiology