Essentials of Genetics Plus Mastering Genetics with eText -- Access Card Package (9th Edition) (Klug et al. Genetics Series)
9th Edition
ISBN: 9780134047201
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino
Publisher: PEARSON
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Chapter CHST2, Problem 1DQ
The RNA World Hypothesis suggests that the earliest forms of life used RNA as a genome instead of DNA. Why then do we not see organisms alive today with RNA genomes?
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If RNA played a key role in the origin of life,why do cells now use DNA for information storage and proteins to carry out other cellular processes?
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Most evolutionary biologists now accept that RNA was the first nucleic acid molecule to evolve to store information. Why is this early “RNA world” more likely when you consider how RNA polymerases (such as primase) and DNA polymerases start replicating nucleotide chains?
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Chapter CHST2 Solutions
Essentials of Genetics Plus Mastering Genetics with eText -- Access Card Package (9th Edition) (Klug et al. Genetics Series)
Ch. CHST2 - What are some of the different roles that RNA...Ch. CHST2 -
2. What arguments support the RNA World...Ch. CHST2 - Prob. 3RQCh. CHST2 - How is bacterial DNA methylation and expression of...Ch. CHST2 - What are the three types of small noncoding RNAs...Ch. CHST2 - The mechanism for RNA-induced transcriptional...Ch. CHST2 - Although exRNAs are found in many fluids within...Ch. CHST2 - How and why are eukaryotic mRNAs transported and...Ch. CHST2 - The RNA World Hypothesis suggests that the...Ch. CHST2 - Bacterial sRNAs can bind to mRNAs through...
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- What is so special about RNA that it is hypothe-sized to be an evolutionary precursor to DNA and protein?What is it about DNA that makes it a better material thanRNA for storage of genetic information?arrow_forwardEven though they have several differences, a bacterium and a human cell will both contain DNA. With respect to evolution, what does this fact suggest?arrow_forwardwhich of the following is NOT a possible source of the monomer building blocks in the RNA world hypothesis? o polymerization reactions on mineral surfaces o prebiotic chemistry on asteroids and other material in space o prebiotic chemistry at deep sea vents o prebiotic atmosphereic chemistryarrow_forward
- Suppose that life exists elsewhere in the universe. All life must contain some type of genetic information, but alien genomes might not consist of nucleic acids and have the same features as those found in the genomes of life on Earth. What might be the common features of all genomes, no matter where they exist?arrow_forwardin general, how does the location and abundance of regulatory DNA sequences change with increasing organism complexity? (i.e. bacteria vs yeast vs mammals)arrow_forwardA fairly conserved gene is compared between a human, a chimpanzee, a bear and a banana. How would you expect their DNA sequences to relate?arrow_forward
- What are the most highly-conserved regions of human DNA (when compared to similar DNA sequences in closely-related animals)? A. transposons B. non-transcribed spacers C. introns D. pseudogenes E. exonsarrow_forwardWhat is meant by the term RNA world? Describe observations andevidence that support this hypothesized period of life on Earth. From the perspective of living cells, what are the advantagesof having had the RNA world be superseded by a DNA/RNA/protein world?arrow_forwardWhy are scientists excited to find that RNA molecules can be made that are self-replicating?arrow_forward
- DNA sequences can act as "tape measures of evolution". Scientists analyzing the human genome sequence were surprised to find that some regions of the human genome that are most highly conserved (similar to comparable regions in other species) don't code for proteins at all. Given what you've learned about "genes" speculate on reasons why this might be so.arrow_forwardClearly, all humans have variations in their DNA sequences. How is it possible to sequence the human genome if every individual is unique? How was the diversity of the human genome addressed?arrow_forwardWhich of the following is FALSE about the human genome? a. repetitive DNA is approximately 50% of the base pairs b. less than 5% of the DNA codes for unique proteins c. many genes have introns d. The genes are all unique to humans and show no similarity to genes from other organisms.arrow_forward
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DNA vs RNA (Updated); Author: Amoeba Sisters;https://www.youtube.com/watch?v=JQByjprj_mA;License: Standard youtube license