1. Gene Expression Practice Test

2. 1. DNA & RNA nucleotides differ in all EXCEPT their ___.
functions
nitrogen bases
sugars
phosphate groups

3. 2. Which of the following is true of mutations? Choose all that apply.
They happen during transcription.
They are mistakes in DNA sequences.
They may result in wrong proteins made.
They’re removed during RNA processing.

4. 3. The protein has a great potential for variation of structure because
amino acids may be joined in a number of different combinations.
amino acids combine together to form different amino acids.
introns increase the available variations.
nucleotides change all the time.

5. 4. Which of the following does not describe the codon?
start & stop
AUG
leucine
determines amino acid

6. 5. Which one of these is false about RNA processing?
introns are removed
exons are removed
mG cap is added
polyA tail is added

7. 6. Which of the following are not complementary to each other?
DNA & tRNA
DNA & mRNA
codon & anticodon
all are complementary

8. 7. New variations are usually a result of which type of mutation?
frameshift mutation
point nonsense mutation
silent mutation
point missense mutation

9. 8. How many tRNAs are needed for this following mRNA sequence: AUGAAGGUCCUAUAG3 4 5 6

10. 9. Which series of steps is correct for the information from RNA to be translated into the polypeptide?
ribosome attaches, mRNA formation, each amino acid added, peptide bond
ribosome attaches, mRNA formation, all amino acids added, peptide bond
mRNA formation, tRNA attaches, ribosome attaches, polypeptide forms
mRNA formation, ribosome attaches, each amino acid added, peptide bond

11. Histones cause DNA to coil tightly & damage the sequence.
10. All your cells contain identical DNA, yet not all traits are expressed at once. Which of these best explains how this happens?
Histones cause DNA to coil tightly & damage the sequence.
Histones cause DNA to coil tightly & deny RNA polymerase from transcription.
Tightly coiled DNA prevents mRNA from leaving the nucleus.
Non-coding exons are spliced out to prevent transcription.