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A research team is studying a patient with a rare developmental disorder. Genomic sequencing reveals a heterozygous point mutation in the zinc finger domain of CTCF, abolishing its ability to bind DNA at several target loci. The patient exhibits craniofacial abnormalities, intellectual disability, and growth retardation — a phenotype resembling CTCF haploinsufficiency syndrome.   Question Based on the mutation described, which downstream consequence is most directly responsible for the patient’s phenotype?

Which conclusion best explains how silencing is maintained at these loci despite the loss of H3K27me3?

Extended Answer Question: Answer the following in approximately one paragraph (3-5 well-developed sentences).  Your notes and the textbook may be accessed during the answering of this question but our class discussions may not.  Responses will be graded on the accuracy of chemistry terminology used and the quality and completeness of the explanation, including how well ideas are connected and supported. Explain the science and humor of this comic.    

We have learnt that [blk1] deposits H3K27me3, which is then recognized by canonical [blk2] to deposit H2AK119ub1 and compact chromatin. 

Extended Answer Question: Answer the following in approximately one paragraph (3-5 well-developed sentences).  Your notes and the textbook may be accessed during the answering of this question but our class discussions may not.  Responses will be graded on the accuracy of chemistry terminology used and the quality and completeness of the explanation, including how well ideas are connected and supported. Is the process shown is a physical or a chemical change?  Explain. Acetone vs. Styrofoam  

Extended Answer Question: Answer the following in approximately one paragraph (3-5 well-developed sentences).  Your notes and the textbook may be accessed during the answering of this question but our class discussions may not.  Responses will be graded on the accuracy of chemistry terminology used and the quality and completeness of the explanation, including how well ideas are connected and supported. Is fire matter?    

How does paternal high-fat diet alter sperm tRNA-derived fragments (tRFs)?

The health care provider prescribes a benzodiazepine instead of a barbiturate for use as a hypnotic. Why are benzodiazepines preferred over barbiturates for use as hypnotics?

A patient taking niacin should be taught to expect which side effect?

The nurse is reinforcing teaching about antihistamines. How should antihistamines be taken to be the most therapeutic?