*** Need help with this WHOLE assignment please Page 108 Fill in the blanks: The
ID: 50080 • Letter: #
Question
*** Need help with this WHOLE assignment please
Page 108
Fill in the blanks:
The nucleotide that is complementary to thymine is Blank 1 and the nucleotide that is complementary to cytosine is guanine.
In an actual DNA molecule, weak bonds called Blank 2 bonds would keep the left strand attached to the right strand.
The two scientists who are credited with deducing the structure of DNA are Watson and Blank 3.
DNA replication occurs in the Blank 4 of the cell, and occurs only Blank 5 in the life cycle of a cell, just prior to the beginning of cell division. (Does it occur once, twice, or continuously?)
DNA replication occurs during this stage of the cell cycle: Blank 6
The nitrogen base found in RNA that is not found in DNA is Blank 7.
3 points
Question 3
Page 108
Fill in the blanks. Spelling must be correct!
A sequence of three letters on a tRNA molecule is called an Blank 1.
A sequence of three letters on mRNA is called a Blank 2.
A sequence of three letters on DNA is called a Blank 3.
mRNA's and tRNA's are used during Blank 4.
Protein Blank 5 occurs continuously in the life of a cell, because cells always need more proteins.
2.5 points
Question 4
Page 113, # 1:
If the template strand of a gene contains 300 DNA nucleotides, about how many nucleotides would the mRNA transcribed from that gene have?
0.5 points
Question 5
Page 113, # 2:
About how many amino acids would you expect there to be in the protein that the gene codes for?
0.5 points
Question 6
Page 113, # 3:
How many transfer RNA molecules would be required to build the protein that the gene codes for?
0.5 points
Question 7
Page 113, # 4
Replace the numbers below with letters to fill in the missing letters in the sequence of bases on the mRNA which codes for hemoglobin:
Blank 1 U A - A C U - C C U - G A G - G A G - Blank 2 A A
Fill in the missing letters in the sequence of bases on the template strand of DNA which codes for hemoglobin:
Blank 3 A T - T G A - G G A - C T C - C Blank 4 C - Blank 5 T T
Fill in the missing letters in the sequence of bases on the mRNA which codes for sickle cell hemoglobin:
U U A - A C U - C C U - Blank 6 U G - G A G - A A A
Fill in the missing letters in the sequence of bases on the template strand of DNA which codes for sickle cell hemoglobin:
A A T - T G A - G G A - Blank 7 A C - C T C - T T T
Note that there is just a one-letter difference between the sequence of bases on the DNA of a person with normal hemoglobin and the DNA of a person with sickle cell anemia.
3 points
Question 8
Page 114
Number these events in DNA replication.
DNA polymerase brings complementary nucleotides to the unzipped strands.
Two complete DNA molecules, identical to the original one, are the end result.
Unzipping exposes unpaired bases on each side of the DNA ladder.
DNA unzips with the assistance of a helicase enzyme.
The enzyme called DNA ligase joins the incoming nucleotides together in long chains.
2.5 points
Question 9
Page 114, D:
Place these events in protein synthesis in the correct order.
The incoming nucleotides join to form mRNA.
A portion of DNA corresponding to one gene unzips.
Complementary RNA nucleotides stand next to the template strand of the unzipped DNA.
tRNA's drop off amino acids and leave.
Amino acids join with one another to form a protein.
Unpaired bases are exposed on the unzipped DNA.
mRNA leaves the nucleus and attaches to a ribosome.
tRNA's line up next to complementary bases on the mRNA.
The new protein leaves.
tRNA's pick up amino acids and carry them to the ribosome.
5 points
Question 10
Here are possible answers for page 116. Your answers may differ. Be sure you understand this activity; if not, ask your instructor for help.
1. A U G - G C U - G A A - U C U - U G G - U A A
2. T A C - C G A - C T T - A G A - A C C - A T T
3. T A C - A G A - C T T - A G A - A C C - A T T
4. A U G - U C U - G A A - U C U - U G G - U A A
5. methionine - serine - glutamic acid - serine - tryptophan - stop
6. The second amino acid is wrong; it should have been alanine, not serine; so this will be a defective protein.
7. T A C - C G A - C T C - A G A - A C C - A T T
8. A U G - G C U - G A G - U C U - U G G - U A A
9. methionine - alanine - glutamic acid - serine - tryptophan - stop
Note that although an incorrect letter has been substituted, the amino acid sequence remains the same. That is because both G A G and G A A both code for the amino acid named glutamic acid.
Explanation / Answer
1. a)The nucleotide that is complementary to thymine is Adenine.
b) In an actual DNA molecule, weak bonds called hydrogen bonds.
Hydrogen bonding between nitrogen base binds the compliimentary strand to each other.
c) The two scientists who are credited with deducing the structure of DNA are Watson and Crick.
d) DNA replication occurs in the nucleus of the cell, and occurs only once in the life cycle of a cell, just prior to the beginning of cell division.
e) DNA replication occurs during this stage of the cell cycle: S phase
f) The nitrogen base found in RNA that is not found in DNA is Uracil.
2. a) A sequence of three letters on a tRNA molecule is called Anti-codon.
b) A sequence of three letters on a mRNA molecule is called Codon.
c) A sequence of three letters on a DNA molecule is called Codon.
d) mRNA's and tRNA's are used during protein synthesis.
e) Protein folding occurs continuously in the life of a cell, because cells always need more proteins
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