1)if a sample of nucleic acid has a nucleotide composition of 15% A, 25% C, 25%
ID: 181163 • Letter: 1
Question
1)if a sample of nucleic acid has a nucleotide composition of 15% A, 25% C, 25% G, and 35% T. What is the most likely conclusion? A) Chargaff was wrong B) the sample represents the DNA of a highly mutated organism C) the sample is likely single stranded RNA D) the sample is single stranded DNA E) it is palindromic DNA2)in eukaryotes, what is the size of the gene encoding a protein of 120 amino acids? A) 120 nucleotides B) 360 nucleotides C) 40 nucleotides D) 480 nucleotides E) impossible to estimate without knowing about the number and length of introns present
3) if one DNA strand has a sequence 5'-ATCGACC-3' then it's complementary strand has the sequence: A) 5'-GGTCGAT-3' B) 5'- ATCGACC -3' C) 3'- ATCGACC -5' D) 3' - GGTCGAT -5' E) this sequence cannot be part of the double helix because the number of purines does not equal the number of pyrimidines
4)which of the following statements about integral membrane proteins is true? A)the membrane spanning region of an integral membrane protein can be in either alpha- helical or beta sheet conformation B)integral membrane proteins can be predicted with reasonable accuracy from primary structure C) type I and type II integral membrane proteins differ in the relative direction that they span the membrane D) type I and type II integral membrane proteins have the same number of transmembrane regions E) all of the above are true 1)if a sample of nucleic acid has a nucleotide composition of 15% A, 25% C, 25% G, and 35% T. What is the most likely conclusion? A) Chargaff was wrong B) the sample represents the DNA of a highly mutated organism C) the sample is likely single stranded RNA D) the sample is single stranded DNA E) it is palindromic DNA
2)in eukaryotes, what is the size of the gene encoding a protein of 120 amino acids? A) 120 nucleotides B) 360 nucleotides C) 40 nucleotides D) 480 nucleotides E) impossible to estimate without knowing about the number and length of introns present
3) if one DNA strand has a sequence 5'-ATCGACC-3' then it's complementary strand has the sequence: A) 5'-GGTCGAT-3' B) 5'- ATCGACC -3' C) 3'- ATCGACC -5' D) 3' - GGTCGAT -5' E) this sequence cannot be part of the double helix because the number of purines does not equal the number of pyrimidines
4)which of the following statements about integral membrane proteins is true? A)the membrane spanning region of an integral membrane protein can be in either alpha- helical or beta sheet conformation B)integral membrane proteins can be predicted with reasonable accuracy from primary structure C) type I and type II integral membrane proteins differ in the relative direction that they span the membrane D) type I and type II integral membrane proteins have the same number of transmembrane regions E) all of the above are true A) Chargaff was wrong B) the sample represents the DNA of a highly mutated organism C) the sample is likely single stranded RNA D) the sample is single stranded DNA E) it is palindromic DNA
2)in eukaryotes, what is the size of the gene encoding a protein of 120 amino acids? A) 120 nucleotides B) 360 nucleotides C) 40 nucleotides D) 480 nucleotides E) impossible to estimate without knowing about the number and length of introns present
3) if one DNA strand has a sequence 5'-ATCGACC-3' then it's complementary strand has the sequence: A) 5'-GGTCGAT-3' B) 5'- ATCGACC -3' C) 3'- ATCGACC -5' D) 3' - GGTCGAT -5' E) this sequence cannot be part of the double helix because the number of purines does not equal the number of pyrimidines
4)which of the following statements about integral membrane proteins is true? A)the membrane spanning region of an integral membrane protein can be in either alpha- helical or beta sheet conformation B)integral membrane proteins can be predicted with reasonable accuracy from primary structure C) type I and type II integral membrane proteins differ in the relative direction that they span the membrane D) type I and type II integral membrane proteins have the same number of transmembrane regions E) all of the above are true
Explanation / Answer
1) The sample is ssDNA as the composition of nucleotide bases is different.
2) In eukaryotes the size of gene encoding the protein of 120 nucleotides is impossible to estimate without knowing about the number and length of introns present.
The protein of 120 aminoacids will have the cDNA of 363 nucleotides with the last 3 nucleotides being the stop codon.
3) The complementary sequence is 5'-GGTCGAT-3'
4) The intergral membrane proteins are the membrane spanning region of an integral membrane protein can be in either alpha- helical or beta sheet conformation. type I and type II integral membrane proteins differ in the relative direction that they span the membrane.
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