Sulfa drugs work on
A. ribosome biosynthesis.
B. folic acid biosynthesis.
C. nucleic acid biosynthesis.
D. peptidoglycan biosynthesis.
Answer: B
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Endochondral ossification involves:
A. the formation of bones from a cartilage model. B. the formation of bones from a collagen model. C. the formation of bone tissue directly from osteoblasts laying down bone material. D. the transformation of spongy bone to compact bone. E. the formation of flat bones such as those that make up the skull.
Environmental air temperature can fluctuate many degrees during the course of a day. A human's body temperature
A. can also fluctuate many degrees. B. must be maintained within a range of a few degrees. C. is raised by sweating and dilation of blood vessels in the skin. D. is not maintained internally but fluctuates with the air temperature. E. is lowered by shivering.
Which of the following is NOT a characteristic of amphibians?
A. They have lungs. B. They have a cartilaginous skeleton. C. They are ectothermic. D. They have a three-chambered heart. E. They have vertebrae.
Gametophytes are multicellular plants that develop from reproductive cells called ________
Fill in the blank(s) with correct word