Which of the following regarding the Haversian System is false?
A. Haversian canals may contain nerve fibers.
B. Haversian canals run parallel to the length of long bone.
C. Haversian canals are created by osteoclasts that tunnel through the bone matrix.
D. It keeps osteocytes alive.
C. Haversian canals are created by osteoclasts that tunnel through the bone matrix.
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Some genes encoding proteins that are essential to
the survival of the organism are called highly conserved sequences. Which of the following is an example of one of these proteins? a. cytochrome b b. muscle structural proteins c. carbohydrate hydrolyzing genes d. skin pigmentation e. keratin
Which variation could be subject to natural selection?
A) A dog with short legs due to malnutrition is able to crawl into holes better than his littermates. B) A tree is not infested by a ground-dwelling beetle when the homeowner cuts the lower branches. C) A hyena is born with a spotted fur pattern that allows it to hide in the grass better than its littermates. D) A pigeon learns that when its keeper comes near it will get fed.
Which of the following is true about an antigenic shift?
A. It avoids genetic reassortment. B. It causes major changes in the flu virus. C. All of the answers are correct. D. It causes minor changes in the flu virus. E. It doesn't cause any changes in the flu virus.
Homeotic genes activate other genes that determine the ____________ of each segment
A. segment B. parasegment C. morphological characteristics D. zygotic