Which of the following individuals has a recessive phenotype?
A. aAbB
B. Aa
C. AA
D. AaBb
E. aabb
Answer: E
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If your mother is heterozygous for Huntington disease, which is caused by a dominant allele, the odds
of your inheriting the disorder from her are
a. 1/4. b. 1/2. c. 3/4. d. 1. e. 0.
The maintenance of the volume and composition of body fluids is the direct responsibility of which
system? a. integumentary b. immune c. digestive d. urinary e. circulatory
Which statement regarding the brain is true?
A) Ventricles in the brain are filled with interstitial fluid. B) The blood-brain barrier helps to maintain a stable chemical environment for the brain. C) Layers of connective tissue, called epithelium, surround and protect the brain and spinal cord. D) White matter is composed of mainly dendrites.
A drug, colchicine, can be added to cells in culture and it stops the polymerization of microtubules. What effect would this have on mitosis?
A. It would slow or block mitosis by preventing DNA replication. B. It would slow or block mitosis by interfering with the spindle apparatus function. C. It would speed up mitosis by increasing the elongation rate of the dividing cell. D. It would speed up mitosis by increasing the rate of DNA replication.