The disease SARS is spread by ______
A. skin to skin contact D. sneeze droplets
B. sexual intercourse E. more than one of these
C. blood infections
D
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According to the endosymbiosis theory of the origin of eukaryotic cells, how did mitochondria originate?
A) from infoldings of the plasma membrane, coupled with mutations of genes for proteins in energy-transfer reactions B) from engulfed, originally free-living proteobacteria C) by secondary endosymbiosis D) from the nuclear envelope folding outward and forming mitochondrial membranes
A waxy cuticle is secreted by _____
a. ground tissue c. a stoma b. epidermal cells d. root hairs
Which blood vessels are the site of exchange between the blood and the interstitial fluid?
1.Arteriole 2.Artery 3.Capillary 4.Vein 5.Venule
Which of the following is not a feature of a population?
A) size B) density C) number of species D) distribution