Textbook QuestionList the order of nucleotides on the mRNA that would be transcribed from the following DNA sequence: CGATTACTTA.1663views
Textbook QuestionWhich of the following is not true of a codon? a. It may code for the same amino acid as another codon. b. It never codes for more than one amino acid. c. It extends from one end of a tRNA molecule. d. It is the basic unit of the genetic code.1582views
Textbook QuestionWhich of the following correctly ranks the structures in order of size, from largest to smallest? a. gene-chromosome-nucleotide-codon b. chromosome-gene-codon-nucleotide c. nucleotide-chromosome-gene-codon d. chromosome-nucleotide-gene-codon1283views
Textbook QuestionUsing the genetic code (Table 10.1), list the order of amino acids encoded by the following mRNA nucleotides: CAACGCAUUUUG. 5107views
Textbook QuestionWhich of the following describes the experimental strategy that was used to decipher the genetic code? a. comparing the amino acid sequences of proteins with the base sequence of their genes b. analyzing the sequence of RNAs produced from known DNA sequences c. analyzing mutants that changed the code d. examining the polypeptides produced when RNAs with particular sequences were translated737views
Textbook QuestionWhich of the following describes the experimental strategy that was used to decipher the genetic code? a. comparing the amino acid sequences of proteins with the base sequence of their genes b. analyzing the sequence of RNAs produced from known DNA sequences c. analyzing mutants that changed the code d. examining the polypeptides produced when RNAs with particular sequences were translated541views
Textbook QuestionFor each of these statements about the genetic code, select True or False. a. T/F Wobble pairing accounts for the redundancy of the genetic code. b. T/F There are 64 different tRNAs that read the 64 possible codons. c. T/F All possible codons are used, but not all codons specify an amino acid. d. T/F Some codons are recognized by proteins, not by tRNAs.899views1rank
Textbook QuestionA minimal genetic code requires only 21 codons—one for each amino acid, and one for a stop signal. Given this, what advantage might be offered by having a code with 64 codons?2867views
Textbook QuestionFor each of these statements about the genetic code, select True or False. a. T/F Wobble pairing accounts for the redundancy of the genetic code. b. T/F There are 64 different tRNAs that read the 64 possible codons. c. T/F All possible codons are used, but not all codons specify an amino acid. d. T/F Some codons are recognized by proteins, not by tRNAs.668views
Textbook QuestionA minimal genetic code requires only 21 codons—one for each amino acid, and one for a stop signal. Given this, what advantage might be offered by having a code with 64 codons?541views
Textbook QuestionUsing Figure 17.6, identify a 5′→3′ sequence of nucleotides in the DNA template strand for an mRNA coding for the polypeptide sequence Phe-Pro-Lys. a. 5′-UUUCCCAAA-3′ b. 5′-GAACCCCTT-3′ c. 5′-CTTCGGGAA-3′ d. 5′-AAACCCUUU-3′1942views
Textbook QuestionDraw a hypothetical metabolic pathway in Neurospora crassa composed of five substrates, five enzymes, and a product called nirvana. Number the substrates 1–5, and label the enzymes A–E, in order. (For instance, enzyme A catalyzes the reaction between substrates 1 and 2.) (b) Suppose a mutant strain can survive if substrate 5 is added to the growth medium, but it cannot grow if substrates 1, 2, 3, or 4 are added. Which enzyme in the pathway is affected in this mutant?913views
Textbook QuestionDraw a hypothetical metabolic pathway in Neurospora crassa composed of five substrates, five enzymes, and a product called nirvana. Number the substrates 1–5, and label the enzymes A–E, in order. (For instance, enzyme A catalyzes the reaction between substrates 1 and 2.) (a) Suppose a mutation made the gene for enzyme C nonfunctional. What molecule would accumulate in the affected cells?892views
Textbook QuestionDraw a hypothetical metabolic pathway in Neurospora crassa composed of five substrates, five enzymes, and a product called nirvana. Number the substrates 1–5, and label the enzymes A–E, in order. (For instance, enzyme A catalyzes the reaction between substrates 1 and 2.) (b) Suppose a mutant strain can survive if substrate 5 is added to the growth medium, but it cannot grow if substrates 1, 2, 3, or 4 are added. Which enzyme in the pathway is affected in this mutant?519views
Textbook QuestionDraw a hypothetical metabolic pathway in Neurospora crassa composed of five substrates, five enzymes, and a product called nirvana. Number the substrates 1–5, and label the enzymes A–E, in order. (For instance, enzyme A catalyzes the reaction between substrates 1 and 2.) (a) Suppose a mutation made the gene for enzyme C nonfunctional. What molecule would accumulate in the affected cells?525views
Textbook QuestionOne of the possibilities considered about the genetic code was that the code was overlapping, meaning that a single base could be part of up to three codons. How many amino acids would be encoded in the sequence 5′-AUGUUACGGAAU-3′ by a non-overlapping and a maximally overlapping triplet code? a. 4 (non-overlapping) and 16 (overlapping) b. 4 and 12 c. 4 and 10 d. 12 and 41228views
Textbook QuestionOne of the possibilities considered about the genetic code was that the code was overlapping, meaning that a single base could be part of up to three codons. How many amino acids would be encoded in the sequence 5′-AUGUUACGGAAU-3′ by a non-overlapping and a maximally overlapping triplet code? a. 4 (non-overlapping) and 16 (overlapping) b. 4 and 12 c. 4 and 10 d. 12 and 4873views
Textbook QuestionIf DNA has a sequence of AAA, then a segment of mRNA synthesized on it will have a sequence of a. TTT, b. UUU, c. GGG, d. CCC.446views
Textbook QuestionResearchers compared the amino acid sequences of the transport protein in zebrafish, puffer fish, mice, and humans. They found many stretches with identical sequences in all four species. Does this mean that the corresponding mRNA base sequences are also the same in these four species? Explain why or why not.707views
Multiple ChoiceA particular triplet of bases in the template strand of DNA is 5′-AGT-3′. What would be the corresponding codon for the mRNA that is transcribed?6022views12rank
Multiple ChoiceA particular triplet of bases in the coding sequence of DNA is AAA. The anticodon on the tRNA that binds the mRNA codon is ________.6095views17rank
Multiple ChoiceWhich of the following sequences of nucleotides are possible in the template strand of DNA that would code for the polypeptide sequence Phe–Leu–Ile–Val?7099views24rank
Multiple ChoiceWhen RNA is being made, the RNA base __________ always pairs with the base __________ in DNA. 1962views
Multiple ChoiceThe number of nucleotide bases "read" together on the mRNA to designate each amino acid is __________; this unit is called a(n) __________. 1190views1rank
Multiple ChoiceThe codons AAA, CCC, GGG, and UUU specify the amino acids lysine, proline, glycine, and phenylalanine, respectively. If the base sequence 5′-CCCAAATTTGGG-3′ is present in the coding strand of a stretch of DNA, what polypeptide sequence would be encoded by the corresponding template strand? 3830views
Multiple ChoiceIn many cases, more than one codon codes for the same amino acid. Because of this, we say that the code is __________. 1156views
Multiple ChoiceBacteria can transcribe and translate human genes to produce functional human proteins because __________. 1188views
Multiple ChoiceThe mRNA codons 5′-CAA-3′ or 5′-CAG-3′ are translated as the amino acid glutamine by __________. 1618views1rank