Human Biology: Concepts and Current Issues (8th Edition)
8th Edition
ISBN: 9780134042435
Author: Michael D. Johnson
Publisher: PEARSON
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Textbook Question
Chapter 17, Problem 8TY
How many different amino acids could be encoded if the genetic code was a doublet code (two bases) instead of a triplet code?
a. 2
b. 4
c. 8
d. 16
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Students have asked these similar questions
What is the maximum number of amino acids that can be encoded by a gene with 45 bases plus a stop codon?a. 15 c. 90b. 45 d. 135
If instead of 20 amino acids there were 200 amino acids, then how many nucleotides would you be minimally needed for each codon?a. 3
b. 4
c. 5 d. 6
e. 7
If a tRNA has an anticodon with the sequence 5′-CAG-3′, which amino acid does it carry?
a. Aspartic acid c. Leucine
b. Valine d. Glutamine
Chapter 17 Solutions
Human Biology: Concepts and Current Issues (8th Edition)
Ch. 17 - How do you feel about the creation and then...Ch. 17 - How far should we go–to what lengths and at what...Ch. 17 - Describe how DNA is replicated before cell...Ch. 17 -
2. Compare and contrast the processes of...Ch. 17 - Explain what mutations are and the role of DNA...Ch. 17 - Name the four phases of mitosis and describe...Ch. 17 -
5. Explain why only one large egg is formed...Ch. 17 - Describe what is meant by selective gene...Ch. 17 - Explain how factors present in the environment can...Ch. 17 - Describe how ribosomes contribute to the formation...
Ch. 17 - Prob. 9CRCh. 17 - Prob. 10CRCh. 17 - What would be the outcome if a cell completed...Ch. 17 - Prob. 2TYCh. 17 - Prob. 3TYCh. 17 - Prob. 4TYCh. 17 - Which of the following are listed in order from...Ch. 17 - Prob. 6TYCh. 17 - Which is likely to be the shortest chain of...Ch. 17 - How many different amino acids could be encoded if...Ch. 17 - Prob. 9TYCh. 17 - Why do cells within an organism differentiate,...Ch. 17 - Which method of cloning is most similar to the way...Ch. 17 - Prob. 12TYCh. 17 - Prob. 13TYCh. 17 - Prob. 14TYCh. 17 -
15. How does the production of sperm differ from...Ch. 17 - Prob. 1AWKCh. 17 - Prob. 2AWKCh. 17 - Prob. 3AWKCh. 17 - Prob. 4AWKCh. 17 - Mitochondria contain their own DNA that is...Ch. 17 - Bacteria can reproduce by simple cell division....
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- The AUC and AUA codons in mRNA both specify isoleucine. What feature of the genetic code explains this? a. complementarity b. nonsense codons c. universality d. degeneracyarrow_forwardHow many nucleotides are in 12 mRNA codons? a. 12 b. 24 c. 36 d. 48arrow_forwardIn Eukaryotes, DNA is a long molecule inside a tiny nucleus. a. How can this long chain fit in such space? b. How does it affect gene expression?arrow_forward
- A polypeptide is composed of 4 amino acids. How many nucleotide bases on an mRNA strand are necessary to code for the complete making of this polypeptide from initiation to termination? Be sure to include the "start" and "stop" codons. a. 18 b. 15 c. 12 d. 4arrow_forwardWhich sequences are spliced out of the mRNA strand before leaving the nucleus? In other words, which sequences are not part of the code for the amino acids? a. exons b. intronsarrow_forwardIf you were to add all of the components necessary for transcription to a test tube, which nucleic acids would you find in the test tube after transcription termination? a. Double-stranded DNA b. Single-stranded DNA c. Double-stranded RNA d. Single-stranded RNA e. Double-stranded RNA/DNA hybrid f. A and Darrow_forward
- With regard to transcriptional termination in eukaryotes, which model suggests that RNA polymerase is physically removed from the DNA? a. Allosteric model b. Torpedo model c. Both models d. Neither modelarrow_forwardWhich statement BEST DESCRIBES the tRNA structure? A. Amino acids bind to the 5′ end of the tRNA molecule. B. When a tRNA has an amino acid attached to it, it is considered to be a charged tRNA C. Synthetases are not important to tRNA D. Amino acids are linked to tRNAs with hydrogen bondsarrow_forwardIf eukaryotes have monocistronic genes, why is the number of known proteins more than the number of known genes? A. Post-translational modification B. Alternative splicing C. Base substitution D. Post-transcriptional modificationarrow_forward
- What transcripts will be most affected by low levels of α- amanitin? a. 18S and 28S rRNAs b. pre-mRNAs c. 5S rRNAs and tRNAs d. other small nuclear RNAsarrow_forwardIf a splice site were mutated so that splicing did not take place, what would be the effect on the mRNA? a. It would be shorter than normal. b. It would be longer than normal. c. It would be the same length, but would encode a different protein.arrow_forwardWhich feature of promoters can be found in both prokaryotes and eukaryotes? a. GC box b. TATA box c. octamer box d. -10 and -35 sequencesarrow_forward
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