The chemical structure of chlorophyll is based on a complex organic ring structure, a long
hydrophobic side chain and an atom of _________ in the center of the ring.
a. carbon
b. manganese
c. magnesium
d. iron
e. nitrogen
C
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In subarctic saltmarshes, scientists have found that the addition of calcium has no effect on productivity, but additional iron does increase productivity. In this example, iron
A. is a precursor to calcium. B. stimulates evapotranspiration. C. biomagnifies in the marsh plants. D. is a limiting factor. E. blocks the effect of calcium.
Helena received a pea plant from her neighbor, and she wants to know its genotype. The neighbor told Helena that the plant produces round peas, which is a dominant trait (R) to wrinkled peas (r). Helena performs a test cross and observes that half of the offspring plants produce wrinkled peas. What is the genotype of the plant Helena received from her neighbor?
a. homozygous recessive, rr b. heterozygous, Rr c. heterozygous, RR d. homozygous dominant, RR
Why is carbon ideally suited to be the "backbone" in molecules produced by living organisms? What will be an ideal response?
Vacuoles for ingesting food and regulating their water balance are characteristic of
A. sporozoans. B. spirochetes. C. trypanosomes. D. algae. E. ciliates.