Snakes are most closely related to:
a. lizards.
b. turtles.
c. eels.
d. caecilians.
e. synapsids.
A
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Where does the energy come from to add a uracil to the 3' end of a transcript?
A. the energy released by allowing the uracil to complementary base pair with an adjacent thymine B. the hydrolysis of a single phosphate from the incoming UTP molecule C. the cell's supply of ATP D. the hydrolysis of pyrophosphate from the incoming UTP molecule E. the hydrolysis of all three phosphate groups from the incoming UTP molecule
Crossing over is important because it
1.eliminates a bad allele from being in an egg or sperm cell. 2.increases the variation in the DNA of eggs and sperm. 3.increases the number of alleles in the eggs and sperm. 4.changes the alleles for traits on a chromosome.
A feature that only mammals have is:
a. predatory behavior. b. internal skeleton. c. bilateral symmetry. d. a skeleton of calcium carbonate. e. hair.
Answer the following questions true (T) or false (F)
1. Contraction of the diaphragm causes exhalation to occur. 2. Pulmonary ventilation occurs because of pressure differences between the lungs and the external environment. 3. Digestion is a process of mechanical and chemical breakdown of larger food molecules into smaller ones that can be absorbed.