All arthropods have:
a. six legs and three body segments.
b. a chitinous exoskeleton and jointed appendages.
c. antennae and compound eyes.
d. stinging mouthparts.
a mantle and a radula.
Answer: b. a chitinous exoskeleton and jointed appendages.
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Which of the following is NOT a mechanism used by bacteria to condense their DNA?
A. Super coiling B. Packaging the DNA with histone proteins C. Looping of the DNA D. Increase or decrease the number of turns in the DNA E. Anchoring the DNA loops with DNA-binding proteins
Barr bodies will
A. be formed in females only. B. be formed in males only. C. be formed in both males and females, depending on the number of X chromosomes possessed by an individual. D. cause an increased production of X-linked gene products. E. inactivate Xic on autosomes.
The duckbill platypus is different than most mammals because it
A. doesn't secrete milk. B. lacks hair. C. doesn't give birth, but lays eggs. D. is "cold-blooded." E. All of the choices are correct.
In a humoral or antibody-mediated immune response, specific B cells are stimulated by Helper T cells to transform into plasma cells that secrete antibodies. What would be an important feature added to B cells In this transition process?
A) Duplication of specific gene sequences for the appropriate antibody. B) Increased rough endoplasmic reticulum in order to have the surface area needed for antibody production. C) Duplication of lysosomes in order to store the antibodies before transport.