Standard Precautions include:
a. using barrier devices to prevent exposure to skin and mucous membranes.
b. recapping needles by hand.
c. storing drinks but not food in laboratory refrigerators.
d. discarding sharps in plastic biohazard bags.
A
Using barrier devices to prevent exposure to skin and mucous membranes is an essential standard laboratory precaution that should be adhered to by all laboratory personnel.
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Garstang's theory states that the vertebrates originated from:
A. larval tunicates that developed the ability to reproduce sexually while retaining the larval body form B. a gradual modification of the adult body form of Urochordates C. larval Cephalochordates that developed the ability to reproduce sexually while retaining the larval body form D. echinoderms with a post anal tail and notochord E. segmented echinoderms
Most biologists agree that the most recent common ancestor of all animals was probably a ____, an
idea first proposed by Ernst Haeckel in 1874.
a. jellyfish b. ciliated protozoan c. sessile sponge d. chytrid e. colonial, flagellated protist
In the fluid mosaic model of a typical plasma
membrane, what accounts for the fluidity?
a. the proteins, being large, cause the membrane to jiggle around. b. the phospholipids collectively form a jellylike substance similar to the cytoplasm. c. the phospholipids are not bonded to each other and thus are more free to move around. d. water molecules infiltrate the bilayer causing it to become more watery and thus more fluid. e. the phospholipids in a typical plasma membrane form covalent bonds which are elastic and allow the membrane to ‘stretch’.
Natural selection was independently proposed as a means of evolution by Darwin and
A. Wallace. B. Lamarck. C. LeClerc. D. Lyell.