You are investigating cell localization by targeting the carbohydrates associated with various cell types. Based on this molecule's ability to bind various carbohydrates, which of the following would help determine which carbohydrates are found on the cell surface?
A) cadherins
B) proteoglycans
C) pectins
D) connexins
E) lectins
E) lectins
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Actinomycetes are usually found in ________ habitats.
A. freshwater B. marine C. medical D. soil
Erection occurs when
A. the spongy erectile tissue of the penis becomes engorged with blood. B. the veins flowing out of the penis vasoconstrict. C. the arteries of the penis vasodilate. D. nitric oxide is released. E. All of these events occur to promote an erection.
What is the difference between endocrine and exocrine glands?
a. Endocrine glands are discrete structures, while exocrine glands may be specialized cells in other tissues. b. Exocrine glands produce hormones, while endocrine glands do not. c. Endocrine glands only affect cells in the immediate area, while exocrine glands do not. d. Endocrine glands secrete into the interstitial fluid, while exocrine glands release secretions into ducts. e. Exocrine glands secrete neurohormones, while endocrine glands do not.
CO2 and H2O will not form glucose on their own because ____.
A. CO2 does not contain sufficient energy B. H2O does not contain sufficient energy C. neither CO2 nor H2O contain sufficient energy D. the concentration of CO2 is too low in the atmosphere E. the bonds of CO2 and H2O are too stable to be broken without an input of energy