BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Textbook Question
Chapter 18, Problem 5SA
RNA in ribosome catalyzes formation of peptide bonds in all organisms. This supports the hypothesis that______.
| a. RNA can hold more information than DNA |
| b. RNA is more stable than DNA |
| c an RNA world existed prior to the rise of DNA |
| d. proteins evolved before RNA |
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Chapter 18 Solutions
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Ch. 18 - An abundance of___________ in Earths early...Ch. 18 - The first interval of Earths existence is called...Ch. 18 - The prevalence of ironsulfur cofactors in...Ch. 18 - Miller and Urey created a reaction chamber that...Ch. 18 - RNA in ribosome catalyzes formation of peptide...Ch. 18 - By one hypothesis, clay________. a. facilitated...Ch. 18 - Photosynthesis carried out by one group of...Ch. 18 - Mitochondria are most closely related to...Ch. 18 - The presence of ozone in the upper atmosphere...Ch. 18 - A ribozyme consists of ___________. a. clay c. DNA...
Ch. 18 - A rise in oxygen in Earths air and seas set the...Ch. 18 - Which of the following was not present by the end...Ch. 18 - The first chloroplasts evolved from ___________....Ch. 18 - During the Precambrian, _______. a. atmospheric...Ch. 18 - Arrange these events in order of occurrence, with...Ch. 18 - Researchers looking for fossils of the earliest...Ch. 18 - Rickettsia bacteria always live as parasites...
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- Which of the following nucleic acids is a component of ribosomes? a.DNA b.Transfer RNA c.Ribosomal RNA d.Messenger RNAarrow_forwardWhich part of the ribosome in bacteria, forms the catalytic site for peptide bond formation? A. 16S rRNA B. 50S subunit C. 30S subunit D. 23S rRNAarrow_forwardExplain why scientists preferred proteins as the source of genetic material over DNA. A. DNA seemed too simple of a molecule compared to proteins B. Proteins are made up of combinations of 20 different amino acids compared to DNA's 4 bases. The larger number seemed more likely to account for all the variety and diversity in organisms. C. Scientists knew more about proteins than they did DNA. D. All of the answers are correct explanations.arrow_forward
- The nucleotides from a bacterial cell were found to have the following abundances: 39% uracil; 41% adenine, 9% cytosine; 8% guanine. What type of molecule is the genome of the bacteria likely made of? a. Double stranded DNA b. Single stranded DNA c. Messenger RNA d. Double stranded RNAarrow_forwardMatch each statement below with the correct RNA molecule. A. rRNA B. mRNA C. tRNA D. uRNA 1. Contains the codon 2. is read by the ribosome 3. contains the anticodon 4. Transport amino acids to the ribosomearrow_forwardRefer to the figure to answer these questions:a. Add labels for mRNA (including the 5′ and 3′ ends) and tRNA. Inaddition, draw in the RNA polymerase enzyme and the ribosomes,including arrows indicating the direction of movement for each.b. What are the next three amino acids to be added to polypeptide b?c. Fill in the nucleotides in the mRNA complementary to thetemplate DNA strand.d. What is the sequence of the DNA complementary to the templatestrand (as much as can be determined from the figure)?e. Does this figure show the entire polypeptide that this geneencodes? How can you tell?f. What might happen to polypeptide b after its release from theribosome?g. Does this figure depict a prokaryotic or a eukaryotic cell? How canyou tell?arrow_forward
- Which statement best describes the structure of a DNA molecule A. DNA is single-stranded and straight molecule B. DNA is a double-stranded molecule that looks like a spiral staircase C. DNA is a double stranded molecule that is straight like a ladder D. DNA is a single-stranded and curly moleculearrow_forwardA new type of nucleic acid molecule is found have a base composition of 29% adenine, 19% thymine, 21% cytosine and 31% guanine. The molecule is probably: a. single stranded DNA b. double stranded RNA c. double stranded DNA d. single stranded RNAarrow_forwardA particular tRNA is mutated so that the amino acid attachment cannot bind with the aminoacyl-tRNA synthase. What happens when an mRNA transcript contains the codon for this tRNA? A. The tRNA will not bind to this codon. B. Translation stops and the protein is released. C The wrong tRNA is added to the protein chain. D. Translation stops and the protein remains bound to the ribosome.arrow_forward
- Levene proposed that DNA was a tetranucleotide, meaning ___. A. it was made up of the same 4 bases bonded together in the same order B. it was made up of the same 4 bases bonded together in different orders C. it was made up of the same 4 amino acids bonded together in the same order D. it was made up of the same 4 sugars bonded together in different ordersarrow_forwardWhich of the following correctly describes a structural feature of DNA or RNA? a. RNA may fold into complex three-dimensional structures necessary for its activity b. RNA & DNA are both usually double stranded c. DNA tends to fold into complex three-dimensional structures required for its activity d. DNA contains a pentose sugar with a hydroxyl group in the 2' positionarrow_forwardRibosomes contain catalytic ________ molecules. a. tRNA b. mRNA c. rRNAarrow_forward
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