Which natural material seems to be the first used by hominins to make tools?
A) hair B) wood C) feathers D) stones
Answer: D
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The bacterial cell wall is composed of
a) cellulose. b) glucan. c) chitin. d) peptidoglycan.
Select the best response to the question. ? ?What is an exposure incident?
A) a patient's blood or bodily fluids collected by a health care worker B)a mouth, eye, mucous membrane, or needlestick/sharps injury and exposure to blood or other bodily secretions? C) a clinical situation where transmission-based precautions are indicated D) a situation where a worker cleans a contaminated device or area
Which statement is NOT true about echinoderms?
A. The exoskeleton is made of spiny plates. B. Larvae are free-swimming and bilaterally symmetrical. C. A water vascular system allows the tube feet to produce suction. D. Gas exchange occurs through skin gills and tube feet. E. Symmetry is radial in the adult, usually with parts in fives or multiples of five.
BRCA1 and BRCA2
a. are called cancer genes. b. code for tumor suppressing proteins. c. are involved in DNA repair mechanisms. d. in their mutated forms often occur in cancerous breast cells. e. are all of these.