BIOLOGY:DYNAMIC SCIENCE-ACCESS >CUSTOM<
4th Edition
ISBN: 9781337254175
Author: Russell
Publisher: CENGAGE C
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Textbook Question
Chapter 18, Problem 5TYK
A cDNA and a cloned fragment of genomic DNA share sequences from a mouse gene. What differences do you expect to see between the cDNA and genomic DNA sequences?
a. None; they should be identical.
b. The genomic DNA might have an intron or introns.
c. The genomic DNA might have promoter sequences.
d. The genomic DNA might have a poly(A) tail.
e. Both b and c are correct.
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After Drosophila DNA has been treated with a restriction enzyme, the fragments are inserted into plasmids and selected as clones in E. coli. With the use of this “shotgun” technique, every DNA sequence of Drosophila in a library can be recovered.a. How would you identify a clone that contains DNA encoding the protein actin, whose amino acid sequence is known?b. How would you identify a clone encoding a specific tRNA?
You would expect to find a sequence corresponding to the 5' untranslated region (5'-UTR) of a gene in
A.) both a genomic DNA library and a cDNA library
B.)a genomic DNA library
C.)a cDNA library
D.)neither a genomic DNA library nor a cDNA library
If you made a cDNA library from human brain cells and one from human liver cells would the clones in your two libraries be the same?
a)Yes, the libraries would be identical.
b)You cannot make cDNA libraries from these cell types.
c) No, the libraries would have few overlapping clones.
d) The libraries would have a number of similar clones for common cellular proteins but would have a number of unique clones associated specifically with each cell type.
Chapter 18 Solutions
BIOLOGY:DYNAMIC SCIENCE-ACCESS >CUSTOM<
Ch. 18.1 - What features do restriction enzymes have in...Ch. 18.1 - Prob. 2SBCh. 18.1 - What information and materials are needed to...Ch. 18.2 - What is a transgenic organism?Ch. 18.2 - Prob. 2SBCh. 18.3 - What is a restriction fragment length polymorphism...Ch. 18.3 - Prob. 2SBCh. 18.3 - Prob. 3SBCh. 18 - Prob. 1TYKCh. 18 - Prob. 2TYK
Ch. 18 - Why are antibiotic resistance markers such as ampR...Ch. 18 - After a polymerase chain reaction (PCR), agarose...Ch. 18 - A cDNA and a cloned fragment of genomic DNA share...Ch. 18 - Prob. 6TYKCh. 18 - Which of the following is not true of somatic cell...Ch. 18 - Prob. 8TYKCh. 18 - Prob. 9TYKCh. 18 - Prob. 10TYKCh. 18 - Prob. 11TYKCh. 18 - Discuss Concepts A forensic scientist obtained a...Ch. 18 - 13. Suppose a biotechnology company has developed...Ch. 18 - Prob. 14TYKCh. 18 - You learned in the chapter that an STR locus is a...
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- The functions of almost all of the genes in the lambda genome were first explored using mutations. What do you think the mutant phenotype would be if you made an inactivating mutation in the c gene, and why? Be very specific but also very brief.arrow_forwardA mouse gene was identified and determined to be required for formation of heart muscle. A gene with a similar sequence was identified in the human genome. What experiment could scientists do to determine if the mouse and human genes have similar functions? A. The scientist could place the normal human gene into normal mice and see if the resulting mice are viable. B. The scientist could search the human genome for genes that encode proteins that are identical to the protein encoded by the mouse gene. C. The scientist could place the normal human gene into mutant mice to see if heart muscle forms in the mouse. D. The scientist could place the mutant mouse gene into humans to see if humans develop without heart muscle.arrow_forward(a) Why can there be multiple codons for an amino acid? Why would this have evolved? (b) What is the advantage of Illumina Next Generation Sequencing?arrow_forward
- From gene expression studies on cancer, you discovered a hypothetical gene called ABCG2 that is overexpressed in human cancer cells. You want to know if this gene is required for cancer cells to survive, but from your efforts at making a traditional gene knock out, you have found that it is required for embryonic development and can't get to the point of doing a cancer experiment. a. How can you redesign the knockout to get past embryonic lethality? b. How would you then use this mouse line to test if ABCG2 is needed for cancer survival?arrow_forwardIf you knew the mRNA sequence for the human insulin gene could you know what size cDNA fragment you would find on your DNA gel when you ran it against a size standard (a “molecular ruler”)? Would you continue with your insulin cloning experiment, if the DNA from your PCR was very different in size from that predicted by the insulin mRNA? Why or why not?arrow_forwardWhat strategy does a genetically encoded calcium indicator look like to allow fluorescence imaging of only one cell type in an acute slice of the brain? A.The use of fluorescent protein expression inhibitors in other cells B.The injection of a recombinant virus causing the death of other cells C.The use of a promoter specific to these cells D.Activation of membrane receptors specific to these cellsarrow_forward
- Could quantitative PCR, which uses a DNA-binding dye, to show how many copies of the target DNA sequence could be used to quantify the amount of mRNA in a cell? Would you expect that a metabolically active tissue such as the liver would show more cDNA copies in such a method, compared to less metabolically active tissues such as skin cells? One reason that the types and amounts of mRNAs are quantified in different tissue types is to compare which genes are activated and which are inactive. It used to be thought that any gene that was transcribed was automatically translated. The discovery of RNA-degrading systems shows that the real situation in cells is more complemented. Do you believe that a larger amount of mRNA of a given type, say for alpha hemoglobin in immature red blood cells is a reliable indicator that more alpha hemoglobin protein will be made in those cells?arrow_forwardPart a) and b) have already resolved and part c and d tobe resolved. a. What is a genetic mutation? How do genetic mutations differ fromsomatic mutations? b. What are mutagens? Using examples, describe how chemical andphysical mutagens cause mutations. c. Briefly describe the significance of transposons in inducing d. Discuss the practical aspects of mutations.arrow_forwardA certain Drosophila protein-encoding gene has one intron. If a large sample of null alleles of this gene is examined, will any of the mutant sites be expecteda. in the exons?b. in the intron?c. in the promoter?d. in the intron–exon boundary?arrow_forward
- "Complementary DNA (cDNA) libraries offer certain advantages over genomic libraries". Explain how ?arrow_forwardYour friend has discovered that the same human promoter is responsible for producing two different proteins. In Kidney cells it is responsible for the production of protein A while in Brain cells it is responsible for the production of Protein B. Your friend has concluded that this promoter must be controlling two different genes. Do you agree or disagree with your friend's conclusion? Explain why or why not. Be sure to describe the molecular events to support your answer.arrow_forwardWhy can the transcriptome not be used to predict the proteome with complete accuracy? a. It cannot be sequenced like the genome can be. b. The transcriptome is too dynamic to be used to make predictions. c. Not all genes are transcribed. d. Many transcripts are alternatively spliced to produce different proteins.arrow_forward
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