Which of the following best explains why not all individual aminoacyl-tRNA synthetase enzymes recognize the correct tRNA molecules through the anticodon sequence?
A. All tRNA molecules have the same anticodon sequence.
B. Synthetases only contact the tRNA molecules at the 3'-terminal hydroxyl.
C. More than one codon may code for one amino acid.
D. There are 61 different aminoacyl-tRNA synthetase enzymes.
C
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Scientists want to determine whether chemical X, a component of fertilizer, is harmful to fish. They treat fish in the
laboratory with increasing amounts of the chemical for one week and then measure their viability. What is the experimental variable for this experiment?
a. chemical X b. fish c. river d. farming e. water
The final product of DNA replication is:
a. mRNA, tRNA, and rRNA molecules. b. a wide variety of proteins. c. DNA fragments. d. two DNA molecules, each of which contains one new and one old DNA strand. e. the enzymes needed for further processes, such as DNA polymerase.
Bacteria residing in the large intestine release ________, which is absorbed by the human host and used for the process of blood clotting
Fill in the blank(s) with correct word
Atomic force microscopes use a scanning probe that maintains a fixed distance from the surface of the specimen. It is useful for specimens that ________.
A. neither do not conduct electricity well nor have extremely uneven surfaces is correct B. both do not conduct electricity well and have extremely uneven surfaces are correct C. do not conduct electricity well D. have extremely uneven surfaces