In which of the following human blood vessels is the blood pressure lowest?
A) arteries in the head
B) arterioles in the legs
C) capillaries in the feet
D) veins in the head
Answer: D
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An untied inflated balloon flies because
(a) the pressure is higher inside than outside the balloon. (b) the pressure is lower inside than outside the balloon. (c) air flows down its pressure gradient. (d) both a and c occur.
Which of the following statements best describes the gametes of most animals?
a. A sperm is large and motile; an egg is small and nonmotile. b. A sperm is small and nonmotile; an egg is large and motile. c. A sperm is large and nonmotile; an egg is small and motile. d. A sperm is small and motile; an egg is large and nonmotile. e. The sperm and egg are about the same size, but only the sperm is motile.
Molecular oxygen attaches to the iron atoms in a hemoglobin molecule
____________________ Indicate whether the statement is true or false.
Why is DNA replication said to be semiconservative?
a. because half of the DNA in a cell comes from one parent and half comes from the other parent b. because the number of nucleotides within genes remains constant c. because each new DNA molecule is composed of one old strand and one new strand d. because the same process of DNA replication is used by all organisms