MCB 2050

MCB 2050 Midterm Exam Questions With Correct Answers A+ Which is not involved in transcriptional initiation? 1. chromatin decondensation 2. acetylation of histones 3. DSIF 4. mediator complex. 5. TATA box - Answer3. DSIF Which is considered a negative regulator of transcription? 1. NELF 2. P-TEFb 3. TFIIH 4. 5' Cap 5. All of the above - Answer1. NELF Phosphorylation of the CTD of RNA polymerase is necessary for all of the following EXCEPT: 1. allowing detachment of RNA polymera...

MCB 2050 Midterm Exam Questions With Correct Answers A+ The point at which half of the DNA strands are denatured is called the __________, of a given sequence. - AnswerMelting Temperature When B cell receptors encounter antigen the cell will divide rapidly in a process called: - Answer Which of the following would be expected to decrease the melting temperature of double stranded DNA? - AnswerLow G-C content Which of the following factors affect the melting temperature of double stranded...

MCB 2050 Exam Questions With Correct Answers A+ How is DNA stored in eukaryotes? - AnswerIn chromatin True or False? Genes are transcribed in closed chromatin. - AnswerFalse What's the difference between euchromatin and heterochromatin? - AnswerEuchromatin: contains active genes, transcription will occur. Heterochromatin: inactive genes, transcription will not occur. What is a transcriptional activator? - AnswerProteins that bind to specific sites on the promoter DNA and bring about i...

MCB 2050 TEST QUESTIONS WITH CORRECT ANSWERS What are promoter proximal elements? - Answer-regulatory sequences close to the promoter that are unique to specific sets of genes Where are enhancers located? - Answer-Either upstream or downstream of the promoter What are some key properties of Promoters - Answer-1. Function within a short distance 2.Immediately upstream of initiation site 3. Position dependent -Non functional if moved 4. Orientation dependent -Drive transcrip...

MCB 2050 EXAM QUESTIONS AND CORRECT ANSWERS ALREADY PASSED What is an isoform? - Answer-An isoform is a slightly different version of the same protein. Occurs due to alternative splicing where exons are combined. How does alternative splicing of mRNA transcripts contribute to the tuning of auditory hair cells in the chicken cochlea to different vibrational frequencies? - Answer-Alternative splicing produces isoforms of the activated K+ channel that open at different concentrations of ion...

MCB 2050 Midterm Exam Questions with All Correct Answers When double stranded DNA splits into two single stranded molecules this is called... - Answer-Denaturation The term molecular hybridization refers to: - Answer-annealing of single stranded DNA or RNA molecules to those with complimentary sequences What would be expected to decreases the melting temperature of double stranded DNA? - Answer-low G-C content and High A-T content Which cells of the immune system are responsible for...

MCB 2050 EXAM QUESTIONS WITH ALL CORRECT ANSWERS What is position effect variegation? - Answer-Altered gene expression occuring when a gene is transferred from euchromatic region to heterochromatic region (or vice versa). Explain the role of HATs, HDACs, and SWI/SNF in chromatin remodelling. - Answer-HATs: acetylate histone lysine residues resulting in loosening of DNA-nucleosome interaction - more open chromatin HDACs: remove acetyl groups resulting in chromatin compaction. SWI/SNF: ...

MCB 2050 Exam Questions Answered Correctly Latest Update 2024 (Graded A+) Nuclear localization signal - Answers The signal sequence for the nucleus that enables proteins to move through pores in the nuclear envelope. Arc 1 - Answers Is a protein required for plant pollination and shuttles between the cytoplasm and nucleus. Contains an NLS Importin - Answers transport receptor that binds to the NLS of the cargo and interacts with the nuclear pore during cytoplasm to nucleus transport Ran- G...

MCB*2050 Final Exam Key Terms with Complete Solutions Nucleus - Control center of the cell. Contains DNA. Largest organelle. Responsible for 1) compartmentalizations of the cellular genome and its activities and 2) coordination of cellular activities Nucleoplasm - Fluid-filled interior of the nucleus - highly organized. Consists of >30 specialized regions ('subdomains') that participate in specific functions Nucleoid - Prokaryotes possess this region where the chromosome is loc...