Which of the following specifies a single amino acid in a polypeptide chain?
a. the three-base sequence of mrna
b. the complementarity of dna and rna
c. the aminoacyl-trna synthetase
d. the base sequence of the trna

the right side of the picture going down is:

polymerase

protein

transport vesicle

modified protein

the left side of the picture going down is:

dna helix

single-stranded rna

endoplasmic reticulum

ribosome

golgi apparatus

protein released from vesicle

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the answer is b: 1.4 km/hr

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.