A segment of DNA containing 20 base pairs includes 7 guanine residues. How many adenine residues are in the segment? How many uracil residues are in the segment?
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A segment of DNA containing 20 base pairs includes 7 guanine residues. How many adenine residues are in the segment? How many uracil residues are in the segment?
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- DNA molecules consist of chemically linked sequences of the bases adenine, guanine, cytosine, and thymine, denoted A, G, C, and T. A sequence of three basesiscalleda codon. A base may appear more than once in a codon. a) How many different codons are there? b) The bases A and G are purines, while C and T are pyrimidines. How many codons are there whose first and third bases are purines and whose second base is a pyrimidine? c) How many codons consist of three different bases?What is the sequence of amino acids coded by the following sequence of nucleotides on a strand of DNA from the 5' to 3' end? A - T - C - G - C - T - A - C - G - A - A - T How many nucleotides are there?What kind of repeating polynucleotide would yield a single polypeptide with a tetrapeptide repeating unit?
- The sequence of a polypeptide is determined by the order of codons that specify the amino acids in the polypeptide. How many different sequences of codons can specify the polypeptide sequence methionine-histidine-lysine? (Use the table to find the number of possibilities.) SECOND BASE UAU UACFTyrosine (Tyr) UAA -Stop codon UAG -Stop codon UUUL UGU Cysteine (Cys) UCU uc UCA FSerine (Ser) uca Uuc Phenylalanine (Phe) UUAL Leucine (Leu) CAU CAC CAA Glutamine (Gin) CAGF UGA -Stop codon uaa -Tryptophan (Trp) CGU сос CGA FArginine (Arg) CU CU Histidine (His) CuA FLeucine (Leu) Cua) Proline (Pro) CCA cca AAU Asparagine (Asn) AGU Serine (Ser) AGC AUU ACU ACC Threonine (Thr) AACF AAA AAGLysine (Lys) AUC Fisoleucine (lle) AUA Methionine (Met) AUG - Start codon ACA ACG AGA AGGFArginine (Arg) GU GACAspartic acid (Asp) GGA GAA Glutamic acid (Glu) Gaa) GcU -Valine (Val) G GUA GCA FAlanine (Ala) Glycine (Gly) 8. 1 4 THIRD BASE 2. FIRST BASEIn a segment of DNA consisting of 1000 nitrogen bases, 28% of which are thymine, how many bases are adenine, guanine, and cytosine?In the DNA double-helix structure, the larger of the two grooves formed by the helical twist where certain base pairs are exposed is called the:
- If a 100 base-pair double-stranded DNA fragment has 40 cytosines, how many adenines does it contain?What sequence of bases on one strand of DNA (reading in the 3′ to 5′ direction) is complementary to the sequence 5′ T-A-T-G-C-A-G 3′ on the other strand?If the DNA sequence A-T-T-G-G-C-C-T-A on an informational strand mutated and became A-C-T-G-G-C-C-T-A, what effect would the mutation have on the sequence of the protein produced?
- If the sequence of amino acids encoded by a strand of DNA is serine-alanine-lysine-leucine, what is the order of bases in the sense strand of DNA? Use the codon chart below to help you: second letter A G UAU Tyr UGU UUU UCU Phe Сys UUC UCC UAC UGC Ser UAA stop |UGA stop | A UAG stop UGG Trp UUA UCA UUG Leu G UCG CUU CCU CAU CGU His CUC ССС САС CGC Leu Pro Arg CUA ССА САА CGA Gln CUG CCG CAG CGG AUU ACU AAU AGU Asn Ser AUC le A AUA AAC AAA AGC AGA Arg АСС Thr ACA AUG Met | ACG AAG Lys AGG GUU GCU GAU GGU Asp GUC Val GUA GAC S GAA Glu GCC GGC Gly GGA Ala GCA GUG J GCG GAG GGG) O 3' AGACGTTTCAAT 5' O 3' UGUGCAAAGUUA 5' О 5 TGTGCTTТCТТА 3' first letter UCAG UCAG PCAG third letterHow long is an α-helix that contains 74 amino acids?The genetic information contained in DNA consists of a linear sequence of coding units known as codons. Each codon consists of three adjacent DNA nucleotides that corresponto a single amino acid in a protien. The E.coli DNA molecule contains 4.70 x 10^6 base pairs. Determine the number of codons that can be present. Assuming that the average protein in E.coli consists of a chain of 400 amino acids, calculate the maximum number of protiens that can be coded by an E.coli DNA molecule.
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