Protruding papulae on the surface of echinoderms improve respiratory efficiency by ______.  

A.  increasing the concentration difference
B.  increasing the surface area for diffusion
C.  decreasing the distance for diffusion
D.  changing the diffusion constant


B.  increasing the surface area for diffusion

Biology & Microbiology

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The gene locus governing flower color in snapdragons exhibits ____ because heterozygous individuals appear pink

while homozygous individuals are either white or red.

a. codominance b. equilibrium c. autosomal dominance d. complete dominance e. incomplete dominance

Biology & Microbiology

Which of the following is associated with Marfan syndrome?

a. lanky, loose jointed skeleton b. reduced eye sight

c. calcium deposits in the liver d. excessive production of red blood cells e. skin becomes elastic

Biology & Microbiology

What results when nitrogen dioxide and hydrocarbons react in the presence of sunlight?

a. photochemical smog b. industrial smog c. a thermal inversion d. acid rain e. particulate fallout

Biology & Microbiology

Select the phosphorylation reaction:a

glucose + fructose ? sucrose + H2O b. glucose + ATP ? glucose-P + ADP c. glucose-P + fructose ? sucrose + Pi d. glucose + glucose ? maltose e. sucrose + H2O ? glucose + fructose

Biology & Microbiology