When a ________ enters a host cell, it loses the outermost protein layer and is then referred to by virologists as a double-layered particle (DLP).
Fill in the blank(s) with the appropriate word(s).
rotavirus
Rotavirus
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Echinoderms _____
A) have an exoskeleton of hard calcareous plates B) often use tube feet to move around in their environment C) digest their food outside of the organism D) circulate hemolymph in their water vascular system E) are most often found in freshwater environments
The photosynthetic membrane of Halobacterium salinarium contains ________.
A. chlorophyll a and b B. bacteriochlorophyll C. bacteriorhodopsin D. archaeochlorophyll
____ patrol the blood and develop into phagocytic ____ that patrol tissues and interstitial fluid
a. Macrophages; neutrophils b. Neutrophils; macrophages c. Dendritic cells; macrophages d. Monocytes; macrophages e. Monocytes; dendritic cells
Four of the five outcomes listed below are related to
the accumulation of oxygen in the atmosphere. Select the exception. a. Further chemical origin of living cells stopped. b. Chemical attacks by oxygen radicals stopped. c. Aerobic respiration evolved. d. With few exceptions, complex organic compounds could no longer form. e. Some cells detoxified oxygen by using it to accept electrons.