genetics quiz chapter 8

There are ______________ usually found in the genetic code.

1 start codon, 3 stop codons

Which of the following is required for initiation of eukaryotic translation?

5' cap

A sequence of DNA that reads 5' ATGCCTGAATCAGCTTTA 3' should code for ____ amino acids after all the steps of conversion into protein are complete.

6

In the usual flow of genetic information (often called the Central Dogma), which of the following best represents the expression of genes?

DNA RNA protein

Which of the following statements is true under ordinary conditions?

DNA lasts forever in cell and RNA only a short time

The enzyme that makes RNA from a DNA template is

DNA-dependent RNA polymerase

Nonsense codons are

codons that do not code for an amino acid

The sequences found in a mature eukaryotic mRNAs are

exons

A codon is a three-base sequence of

mRNA that codes for an amino acid

In the modification of eukaryotic mRNA, a "cap" consisting of _________ and a tail consisting of _______ are usually added to the transcript.

methylated nucleotides, multiple adenines

A tRNA that recognizes a nonsense codon and inserts an amino acid where protein synthesis should have stopped is called a

nonsense suppressor tRNA

Which of these is NOT a step in transcription?

replication

A mutation that is characterized by a change in the DNA sequence, but no change in the resulting protein sequence, is called a

silent mutation

An anticodon is a physical component of a/an _______ molecule.

tRNA