A flatworm lacks:
a. bilateral symmetry
b. a true coelom
c. mesodermal tissue
d. a nervous system
e. a solute regulating system
b
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The primers in PCR are
a. fragments of mRNA. b designed to base pair with mRNA. c. free nucleotides. d. radioactive. e. none of these.
Genetic goitrous cretinism and alkaptonuria are metabolic disorders in the ____ pathway
a. nucleic acid b. thalassemia c. phenylalanine d. paraoxonase e. lipid biochemical
Sugars are loaded into sieve tubes via simple diffusion
____________________ Indicate whether the statement is true or false.
When plants are grown in hydroponic culture, their roots are suspended in an aerated solution. Why is the solution aerated? Check all that apply.
A. Without oxygen, the xylem would stop flowing. B. Both the light-dependent and the light-independent reactions of photosynthesis require oxygen. C. Oxygen is necessary for the root cells to produce ATP. D. Without oxygen, membrane transport in the roots would be impaired. E. A lack of oxygen would cause the water potential within the roots to decrease.