Bones are held together at joints by
a. tendons.
b. intercellular junctions.
c. ligaments.
d. cartilage.
e. collagen.
C
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Which of the following is NOT a chelicerate?
a. tick b. mosquito c. spider d. horseshoe crab e. scorpion
Since the allele for colorblindness is located on the X chromosome, colorblindness
A.) cannot be inherited. B.) occurs only in females. c.) is sex-linked. d.) occurs only in adults.
Which of the following is incorrect about anabolic steroids?
A. They can lead to liver damage. B. When injected into muscles, they activate growth genes that lead to larger muscles. C. They enhance testicular function. D. In women, they cause masculinization. E. Side effects include acne and balding.
The North American maggot fly diverged into two species because some individuals fed on apples rather than hawthorn trees. Apple fruit mature more quickly than hawthorn fruit, therefore maggot flies that fed on apples also developed more quickly. Pea aphids can feed on alfalfa or red clover; some aphids have higher fitness when eating clover others when eating alfalfa. Host preference can
eventually lead to speciation because A. genetic differences develop. B. lower fitness may result from choosing the wrong host. C. temporal isolation may occur. D. anagenesis may occur. E. genetic differences develop, higher fitness and temporal isolation may occur.