Ecologists use compartment models to describe ____
a. grazer food webs
b. detrital food webs
c. nutrient cycling
d. species richness
e. inputs of solar energy
ANSWER: c
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One double-stranded DNA molecule combined with proteins form ____________________, which is visible as clumps or threads in the cell nucleus
Fill in the blank(s) with correct word
There is more carbon per unit of soil in cold polar regions than in the warm tropics
Indicate whether the statement is true or false
Which statement reflects a key concept about ecosystems?
a. Matter moves linearly through different systems, both abiotic and biotic, within an ecosystem. b. There is a one-way flow of energy through the food webs of ecosystems. c. Conservation should focus on the success and survival of individual species. d. The abiotic environment does not influence the distribution and survival of particular organisms. e. Heat energy can be used by organisms for their daily activities.
?-Glucose is present in potatoes and ?-glucose is present in wood. Both are glucose molecules but one can be used by humans to synthesize ATP and one cannot. Based on this information, what is the best explanation on why humans can only digest one of the glucose types?
A. ?-Glucose and ?-glucose are stereoisomers with OH groups oriented differently. B. ?-Glucose is C6H12O6 and ?-glucose is C5H12O6. C. Only ?-glucose can form polysaccharides. D. ?-Glucose is a chain and ?-glucose is a ring.