Prokaryotic organisms are present in how many domains?

A. One
B. Two
C. Three
D. Four


Answer: B

Biology & Microbiology

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The chemical defense system that complements the immune system and supplements the inflammatory

response is the ____________________ system. Fill in the blank(s) with the appropriate word(s).

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Hemoglobin binds oxygen most efficiently in areas of the body where the pH is low and the concentration of carbon dioxide is high

Indicate whether the statement is true or false

Biology & Microbiology

The procedure used to determine whether a person has a heritable disease is known as

A) DNA sequencing. B) microarray analysis. C) genetic screening. D) northern analysis. E) xenotransplantation.

Biology & Microbiology

A double-stranded DNA molecule can be separated into single strands by heating it to 90°C because _______________________

(a) heat disrupts the hydrogen bonds holding the sugar–phosphate backbone together. (b) DNA is negatively charged. (c) heat disrupts hydrogen-bonding between complementary nucleotides. (d) DNA is positively charged.

Biology & Microbiology