Air enters and leaves through the
a. upper epidermis.
b. lower epidermis.
c. stomata.
d. mesophyll.
e. all of these.
Answer: c
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Describe the three main steps to clone a gene into an organism
What will be an ideal response?
Geckos are able to cling to vertical walls due to ____
a. polar covalent bonds b. van der Waals forces c. ionic bonds d. hydrogen bonds e. nonpolar covalent bonds
The human X chromosome
a. is found in females. b. is found in males. c. carries different genes than the Y chromosome. d. interacts with a Y chromosome as homologues during meiosis. e. fits all of these descriptions.
The "lub" of the lub-DUB sounds heard through a stethoscope when listening to the heart is produced by the
A) inferior vena cava and superior vena cava emptying into the right atrium. B) closing of the two atrioventricular valves. C) contraction of the atria. D) closing of the aortic valve and pulmonary valve. E) pulmonary arteries emptying into the left atrium.