In Siamese cats, enzymes that code for dark fur color are only active in cooler temperatures. Thus, the tips of a
Siamese cat’s ears, feet, and tail are dark but not the warmer regions of its body core. This is an example of ____.
a. Pleiotropy
b. environmental effects
c. epistasis
d. incomplete dominance
e. co-dominance
ANSWER: b
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Which organelle has only a single membrane around it?
A) ribosome B) nucleus C) mitochondrion D) chloroplast E) peroxisome
From the following, select the animal with the least advanced nerve cord
a. chordate b. arthropod c. flatworm d. human e. octopus
The area on the retina that has the greatest density of cone cells is called the ____
a. fovea b. visual ganglion c. lateral geniculate nucleus d. visual cortex e. blind spot
Which of the following is true about Marfan syndrome?
A. The cause is an autosomal recessive mutation. B. The affected gene produces a defective form of the protein actin. C. Connective tissues comprising the heart and blood vessels are weakened. D. One in 5,000 men are affected. E. Those affected are often very short and have mental impairments.