A cell-signaling molecule that is fat-soluble __________
a. must bind to a receptor on the cell membrane before entering the cell
b. can pass through the cell membrane of a cell
c. is unable to pass through the cell membrane of a cell
d. is not as effective as a water-soluble signaling molecule
B
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Translation is the process by which:
A. proteins are synthesized from RNA molecules. B. RNA is synthesized from protein. C. proteins are synthesized from DNA molecules. D. RNA is synthesized from DNA. E. DNA is synthesized from protein.
The wild-type allele of a gene is:
A. dominant to other alleles. B. recessive to other alleles. C. found at the lowest frequency in a population. D. found at the greatest frequency in a population.
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
Which process does not occur in ecosystems?
A) Energy flows through the system. B) Carbon is cycled between biotic and abiotic forms. C) Producers convert light energy to chemical energy. D) Consumers directly use the energy source that powers the system.