Stromatolites are ___________.
a. layered rocks formed by communities of prokaryotes, fossils of which represent the oldest known prokaryotes
b. early prokaryotic fossils found in sediments around hydrothermal vents
c. protocells that form when lipids assemble into a bilayer surrounding organic molecules
d. a surface-coating colony of one or more species of prokaryotes
e. nitrifying archaeans that are extremely abundant in the oceans
Answer: a. layered rocks formed by communities of prokaryotes, fossils of which represent the oldest known prokaryotes
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Match the following items with the correct phrases.
_______1. German measles _______2. Infectious mononucleosis _______3. Diarrhea _______4. Encephalitis _______5. Severe acute respiratory syndrome (SARS) A) Rotavirus B) West Nile virus C) Rubella virus D) A type of coronavirus E) Epstein-Barr virus
With regard to tight junctions,
A) one face of the cell, the apical surface, is in contact with other cells. B) they allow free movement of ions and molecules between cells. C) they are responsible for holding cardiac muscle together. D) they are composed of special proteins called connexins. E) they block the movement of basolateral integral membrane proteins to the apical surface.
A ________ epidemic is characterized by a relatively slow and prolonged rise then a gradual decline in the number of individuals infected.
A. propagated B. common-source C. sporadic D. herd
Four of the five answers listed below are
anthropoids. Select the EXCEPTION.
a. gorilla b. human c. tarsier d. lemur e. monkey