Exons are segments of genes that are transcribed but not translated
Definition
False
Term
A base substitution is the worst type of mutation, because it changes the reading frame of the gene.
Definition
False
Term
Which of the following enzymes is involved in transcription
Definition
Term
If an mRNA message contains 900 ribonucleotide bases, the protein it codes for cannot be more than 300 amino acids long
Definition
True
Term
The genetic code is called "redundant" because many codons may code for a particular amino acid.
Definition
True
Term
Transcription is the process of making a sequence of amino acids from an RNA message
Definition
False
Term
The powerful toxin "ricin" works by destroying ribosomes, which makes it impossible for cells to manufacture proteins
Definition
True
Term
During protein synthesis, both strands of the DNA double helix serve as a template for making RNA; during DNA synthesis, only one of the two strands of the double helix are used
Definition
False
Term
The first step of protein synthesis is the transcription of a messenger RNA in the nucleus of the cell.
Definition
True
Term
Which of the following is a sequence of DNA that signals RNA polymerase to begin transcription
Definition
Promoter
Term
At what stage, and where in the cell does transcription occur?
Definition
During the G phase, in the nucleus
Term
In the life cycle of most eukaryotic cells, proteins are made during mitosis.
Definition
false
Term
Which of the following is attached to a specific amino acid, and delivers that amino acid to ribosomes?
Definition
Transfer RNA
Term
A mutation in DNA sequence may result in a poorly functioning protein; no change in the protein coded for; or even a protein that works more efficiently than the original version
Definition
True
Term
Transposons are segments of DNA that move, or jump, from one location in the genome to another.
Definition
True
Term
Introns are segements of DNA between genes that are not transcribed.
Definition
False
Term
Which of the following is the correct sequence of events in protein synthesis?
Definition
Transcription, exon splicing, translation
Term
Each of twenty amino acids used to make proteins may be coded for by more than one mRNA codon
Definition
True
Term
Which of the following is a three base sequence that occurs on tRNA?
