Which one of the following is an exception to the rules of the genetic code?
A. Specific codons specify the same amino acids in Escherichia coli cells as inhuman cells.
B. The codon UGA is a stop codon in the mitochondria of higher plants.
C. A selenocysteine amino acid is incorporated into proteins in response to a UAG codon.
D. The cell only requires 32 different tRNAs to recognize 61 different codons.
C
You might also like to view...
Which of the following statements about the pericycle is false?
a. It gives rise to branch roots.
b. It is a single layer of cells inside the endodermis. c. It is composed of parenchyma cells. d. Its cells lose their ability to divide upon maturation. e. It is involved in the formation of lateral meristemsd
What class of membrane-transport protein is associated with triggering an action potential?
A. a pump protein B. a ligand-gated ion channel C. a voltage-gated ion channel D. a sodium/potassium symporter
A post-menopausal woman who uses IVF to become pregnant must use eggs donated by another
younger woman. Indicate whether the statement is true or false.
Lacunae are
a. spaces inside a bone cell. b. the places where marrow is located. c. the location of the contractile units of muscle. d. spaces within the matrix. e. found only within cartilage.