The master gene Hox helps to sculpt the body plan of
embryos by
a. inhibiting the Dlx gene to prevent extra limbs.
b. timing the activation of Dlx genes.
c. causing cell death in any cell not expressing the
Hox gene.
d. converting sugar into energy to allow the
process to go to completion.
e. inducing mutations in plants.
Answer: a
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Bones are held together at joints by
a. tendons. b. intercellular junctions. c. ligaments. d. cartilage. e. collagen.
Why is Pacific salmon movement into freshwater streams considered migration if the salmon die at the head of the stream and never return to the ocean?
A) It is not considered migration but immigration. B) Migration is a one-way movement. C) Because their offspring return to the ocean, the entire population participates in the migratory event via different life stages. D) Most male adult fish survive reproduction and return to the ocean.
The rungs of the DNA ladder are formed by base pairs
A. joined by covalent bonds. B. joined by hydrogen bonds. C. joined by ionic bonds. D. NOT joined to each other.
Which of the following is the largest artery of the systemic circuit?
A. vena cava B. carotid artery C. pulmonary artery D. aorta E. femoral artery