Biology 13 Quiz Wanda

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1. 
For a gene to be transcribed, the RNA polymerase has to bind to a _____ sequence of nucleotides on the DNA.
 
promotor
 
2. 
If an mRNA codon reads UAC, its complementary anticodon will be:
 
AUG
 
3. 
In humans, what percent of the genome is devoted to the exons that encode proteins?
 
about 1.5%
 
4. 
The primary RNA transcript is:
 
mRNA before the introns have been removed
 
5. 
A group of DNA nucleotides that contains the information to produce a single protein is a:
 
gene
 
6. 
The bases of RNA are the
same as those of DNA with the exception that RNA contains:
 
uracil instead of thymine
 
7. 
The process of bringing in
the appropriate amino acid into position along the mRNA in the cytoplasm is:
 
translation
 
8. 
Which site on the ribosome
does the new tRNA bring an amino acid to?
 
A
 
9. 
The RNA copy of DNA that
leaves the nucleus and travels to the cytoplasm to make proteins is:
 
mRNA
 
10. 
The site where RNA
polymerase attaches to the DNA molecule to start the formation of mRNA is
called a(n):
 
promoter
 
11. 
The molecule that carries
each amino acid to its correct position along mRNA in the cytoplasm is:
 
tRNA
 
12. 
Which of the following
cannot be a product of transcription?
 
Protein
 
13. 
To turn genes off, a
regulatory protein called a __________ is bound to a regulatory site so that
RNA polymerase is blocked.
 
repressor
 
14. 
The three nucleotide
sequence on mRNA is called an anticodon.
 
FALSE
 
15. 
A(n) ____________ is a
piece of DNA with a group of genes that are transcribed together as a unit.
 
operon
 
16. 
When mRNA leaves the cell's
nucleus, it next becomes associated with:
 
a ribosome
 
17. 
The genetic code is
universal, the same in practically all organisms.
 
TRUE
 
18. 
Small interfering RNAs can
alter gene expression by targeting mRNA for destruction or by blocking
translation of a mRNA.
 
TRUE
 
19. 
Which of the following is
correct about the genetic code?
 
All living things use the
same genetic code.
 
20. 
What is RNA interference?
 
When small RNAs form
double-stranded RNA molecules that can regulate gene expression.
 
21. 
The mRNA has a
three-nucleotide sequence called a _________, while the molecule transporting
the amino acid has a complementary sequence called a(n) _______________.
 
codon, anticodon
 
22. 
All of the following occur
in both prokaryotes and eukaryotes except:
 
there is alternative
splicing of genes
 
23. 
Due to _________, the
25,000 genes of the human genome seem to encode as many as 120,000 different
expressed mRNAs
 
alternative splicing
 
24. 
In eukaryotes,
transcription takes place in the _________ and translation takes place in the
________.
 
nucleus, cytoplasm
 
25. 
The use of DNA information
to direct the production of particular proteins is called:
 
gene expression