A mammalian female's ___________________________.

A. cells usually have multiple Barr bodies
B. body is a mosaic for the X-linked traits she inherits
C. Barr bodies are active in some cells
D. Barr bodies are produced after puberty
E. X-linked recessive genes are always expressed because of the deactivation of an X chromosome in each cell


Answer: B

Biology & Microbiology

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You find what you believe is a new species of animal. Which of the following characteristics would enable you to argue that it is more closely related to a flatworm than it is to a roundworm?

A) It has a cuticle that it sheds to grow. B) It is a suspension feeder. C) It has no coelom. D) It is shaped like a worm. E) It has a mouth and an anus.

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Isoelectric focusing ________.

A. directly reveals the identity of unknown proteins in a complex mixture B. focuses the data gathered onto a specific protein or ORF C. separates proteins based on their size and shape D. separates proteins based on the pH at which they are electrically neutral

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Individuals with diabetes (diabetes mellitus), in which blood glucose levels can be toxically high, are often recommended to avoid consuming sucrose (table sugar)

a) Why is sucrose not recommended for diabetics? b) Why would diabetics be urged to avoid foods that are high in starch? What will be an ideal response?

Biology & Microbiology

In a protein-coding region of DNA, any mutation that replaces a single nucleotide for another will replace any amino acid with any other amino acid.

a. true b. false

Biology & Microbiology