The nucleus of an atom is composed of

A. neutrons.
B. protons and neutrons.
C. protons and electrons.
D. electrons.
E. protons.


Answer: B

Biology & Microbiology

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Diglycerol tetraether lipids ________.

A. are a characteristic feature of thermophilic Archaea B. form typical bilayer membranes in thermophilic Archaea of the genus Thermoplasma C. are found in some bacteria and some Archaea D. tend to make the membrane less rigid

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What are the mechanisms for transcription termination in bacteria?

What will be an ideal response?

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Which of the following describes the process by which dissolved nutrients are forced out of blood vessels and into tissues?

a. simple diffusion b. filtration c. osmosis d. active transport

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Two forms of hemophilia are determined by genes on the X chromosome in humans. Assume that a phenotypically normal woman whose father had hemophilia is married to a normal man. What is the probability that their first daughter will have hemophilia?

A) zero B) 1/2 C) 1/4 D) 1/3 E) 100%

Biology & Microbiology