CAMPBELL BIOLOGY IN FOCUS-TEXT,AP ED.
3rd Edition
ISBN: 9780136811206
Author: Urry
Publisher: SAVVAS L
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Chapter 15.3, Problem 2CC
MAKE CONNECTIONS Inactivation of one of the X chromosomes in female mammals results in a Barr body (see Concept 12.2). Suggest a model for how the noncoding RNA described in Concept 12.2 (XIST RNA) functions to cause Barr body formation.
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MAKE CONNECTIONS Inactivation of one of the Xchromosomes in female mammals involves lncRNA calledXIST RNA, mentioned in this section and in Concept 15.2.Describe transcription and binding of XIST RNA, thensuggest a model for how it initiates Barr body formation.
Dosage compensation is critical for organisms with sex chromosomes to equilibrate gene expression. The role of long non-coding RNAs has been shown to play an important role in affecting the decision to carry out X chromosome inactivation during dosage compensation in mammals.
Q9a) How can a long non-coding RNA affect the decision to keep an X-chromosome active in female mammals?
Q9b) How can a long non-coding RNA initiate the steps to silence the chromosome to be inactivated?
Q9c) Explain which long non-coding RNA is responsible for the various steps to silence the inactive X and describe how its function leads to changes in the chromatin that are incompatible with active transcription off the inactive X
Mating
Ste12
Tec1
Budding
17. (8 points) Scientists are studying the transcription factors
Ste12 and Tec1. They have found that when ste12 binds to
one part of the genome alone it activates the transcription
of genes important in mating pheromones. They also found
that when Tec1 binds to another part of the genome alone
it activates the transcription of cellular budding genes.
Lastly, they found that in another part of the genome,
Ste12 and Tec1 both bind to the DNA, they activate the
transcription of genes that control the formation of filaments.
a) These proteins bind to enhancers. Is Ste12 and Tec1 activators or mediators? How do
you know?
Filamentation
b) Is this system an example of combinatorial control or coordinated control, both or
neither? Explain your answer.
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Chapter 15 Solutions
CAMPBELL BIOLOGY IN FOCUS-TEXT,AP ED.
Ch. 15.1 - How does binding of the trp corepressor to its...Ch. 15.1 - Describe the binding of RNA polymerase,...Ch. 15.1 - WHAT IF? A certain mutation in E. coli changes the...Ch. 15.2 - Prob. 1CCCh. 15.2 - Compare the roles of general and specific...Ch. 15.2 - Prob. 3CCCh. 15.3 - WHAT IF? Suppose the mRNA being degraded in Figure...Ch. 15.3 - MAKE CONNECTIONS Inactivation of one of the X...Ch. 15.4 - Prob. 1CCCh. 15.4 - WHAT IF? Study the microarray in Figure 15.17. If...
Ch. 15 - If a particular operon encodes enzymes for making...Ch. 15 - The functioning of enhancers is an example of A. a...Ch. 15 - Which of the following is an example of...Ch. 15 - Prob. 4TYUCh. 15 - Prob. 5TYUCh. 15 - Which of the following would not be true of cDNA...Ch. 15 - Prob. 7TYUCh. 15 - SCIENTIFIC INQUIRY Imagine you want to study one...Ch. 15 - FOCUS ON EVOLUTION DNA sequences can act as tape...Ch. 15 - FOCUS ON INTERACTIONS In a short essay (100150...Ch. 15 - Prob. 11TYU
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- Hi, can you please elaborate about the following: 1) Is hyaluronan a natural product that can prevent cancer? 2) Are jumping genes the mechanism by which elephant genes were duplicated?arrow_forwardDiscuss the similarities and differences between the bithorax and Antennapedia complexes in Drosophila and the Hox gene complexes in mice.arrow_forwardExplain about how X chromosome inactivation takes place in mammals at the chromosomal and molecular level. B. What genes are involved in inactivating a human X chromosome? . C. What role does X chromosome-specific inactivating transcript --XIST-- non coding RNA play in the inactivation of the human X chromosome.arrow_forward
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