Most archaeal cell walls consist of ____; most bacterial cell walls consist of a polymer of peptides and polysaccharides
a. lipids
b. proteins
c. phospholipids
d. glycoproteins
e. glycolipids
b
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A solution at a pH of 10 contains how many times more hydrogen ions than a solution at a pH of 7?
a. 2 b. 3 c. 10 d. 100 e. 1,000
Blood vessels show which sign of aging?
a. elastin fibers in their walls are replaced by collagen or calcium deposits b. they become softer and expand more easily c. the smooth muscle layer constricts more readily d. elastin fibers double in quantity e. veins develop more valves
Answer the following questions true (T) or false (F)
1. Guard cells open stomata when they engorge with water and bow outward. 2. The "style" is the long, slender structure of the stamen. 3. Carpels are the often-colorful parts of a flower that attract pollinators.
Ticks and horseshoe crabs are members of subphylum:
A) Crustacea. B) Insecta. C) Urochordata. D) Chelicerata. E) Uniramia.