Which of these is expected to be SMALLEST?

a) Bacteriophage M13, a virus

b) Chilomastix mesnili, a unicellular eukaryote

c) Methanobrevibacter smithii, an archaean prokaryote

d) Bacteroides thetaiotaomicron, a bacterial prokaryote


Answer is a) Bacteriophage M13, a virus (A virus is roughly 100x smaller than a prokaryotic cell )

Biology & Microbiology

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The gizzard is to a bird as the _____________ is/are to a mammal.  

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A controlled experiment _____

A) is repeated many times to ensure that the results are accurate B) includes at least two groups, one of which does not receive the experimental treatment C) includes at least two groups, one differing from the other by two or more variables D) includes one group for which the scientist controls all variables

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In humans, assume that the allele for brown eyes is dominant and the allele for blue eyes is recessive. If two browneyed

individuals have a child with blue eyes, that means:a. both parents are homozygous for brown eyes. b. both parents are heterozygous for eye color. c. there is a 1/4 chance that their second child will have brown eyes. d. there is a 1/2 chance that their second child will have blue eyes. e. there is a 3/4 chance that their second child will have blue eyes

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Which of the following statements regarding an atom with high electronegativity is true?

a. It will have fewer protons than an atom with low electronegativity. b. It will have a tendency not to attract electrons. c. It will most likely be located on the left-most side of the periodic table of elements. d. None of these choices are correct. e. All of these choices are correct.

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