Match the molecules below with their functions.
A. Main storage carbohydrate in animals
B. The main component of plant cell walls
C. Main storage carbohydrate in plants
D. Main component of cell membranes
E. Waterproofs biological structures
F. Responsible for sexual development
G. Precursor for important molecules such as bile salts
H. Contains information to build a new cell
I. Active role in protein synthesis
A. Glycogen
B. Cellulose
C. Starch
D. Phospholipid
E. Wax
F. Steroid
G. Cholesterol
H. DNA
I. RNA
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The purple nonsulfur bacteria
A. utilize organic molecules as a source of electrons for photosynthesis. B. typically can grow aerobically in the dark as chemoorganoheterotrophs. C. grow anaerobically as photoorganoheterotrophs. D. All of the choices are correct.
A prokaryote’s cell shape is reinforced by
a. phospholipids. b. DNA. c. protein filaments. d. transport proteins. e. ribosomes
The niche of an earthworm in an ecosystem is
a. a producer. b. a consumer. c. a detritivore. d. a decomposer. e. more than one of these.
The largest group of animals (in terms of number of species) is the vertebrates.
a. true b. false