Make a list of ways you can reduce your negative impacts on our living planet. What will be an ideal response?
ANSWER:1.
Reduce energy usage.
2. Reduce consumption of non-renewable mineral resources.
3. Contribute to ecological restoration projects.
4. Consider where the products you purchase and use are coming from.
5. Recycle.
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There are sixty-one mRNA codons that specify an amino acid, but only forty-five tRNAs. This is best explained by the fact that _____
A) some tRNAs have anticodons that recognize four or more different codons B) the rules for base pairing between the third base of a codon and tRNA are flexible C) many codons are never used, so the tRNAs that recognize them are dispensable D) the DNA codes for all sixty-one tRNAs, but some are then destroyed E) competitive exclusion forces some tRNAs to be destroyed by nucleases
To avoid losing the ability to pull water from the soil as a result of cavitation, plants __________. (Select all correct answer options.)
A. have parallel water conduits B. generate high tensile forces in the xylem C. cannot occupy certain habitats D. close stomata when the tensile forces in the xylem are very large
Osteoclasts function in bone remodeling to
a. free mineral ions. b. stimulate blood cell formation. c. accelerate bone repair. d. lay down a bony matrix. e. do all of these
The metabolic process ____________________ converts pyruvate to lactic acid. Fill in the blank(s) with the appropriate word(s)