What is a defining characteristic of members of the Class Testudines?
A. They lack limbs.
B. They have a hard shell.
C. They have a kinetic skull.
D. They have a four-chambered heart.
B. They have a hard shell.
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A series of markers have the following frequencies. Which would be the most useful for DNA profiling?
A) 1/60 B) 1/5200 C) 1/500 D) 1/40
What is the cause of blindness in mole rats?
a. They live in dry areas that do not provide enough moisture. b. They live in a group and do not need to see. c. They live in the light and are blinded by it. d. They live in underground darkness.
When referring to membrane glycolipids and glycoproteins, what does the prefix "glyco-" indicate?
a. polar carbohydrate groups that are attached to the molecules b. nonpolar carbohydrate groups that are attached to the molecules c. the molecules that are attached to the membrane by ionic bonds d. the molecules that are attached to the membrane by covalent bonds
Which of the following is NOT a characteristic of viruses?
A) they are visible with a light microscope. B) they are acellular. C) they are composed of genetic material and protein. D) they are typically smaller than prokaryotic cells. E) they are obligatory parasites.