Bioc 385 - Study guides, Class notes & Summaries

Number the RNA processing steps in order from 1-6 to generate mRNA transcript. a) ___ 3' end cleavage and polyadenylation b)__ binding of the U1 and U2 snRNPs c)__ generating 7-methylguanosine at 5' end d)__ mRNA export from the nucleus to cytosol e) __ribozyme cleavage of the intron lariat f)__ dissociation of RNA Pol 2 from DNA correct answers a) _4_ 3' end cleavage and polyadenylation b)_2_ binding of the U1 and U2 snRNPs c)_1_ generating 7-methylguanosine at 5' end d)_6_ mRNA ex...

What must be constant for a living organism to maintain a homeostatic condition that is far from equilibrium? correct answers constant input of energy What do living systems abide by? correct answers the Laws of Thermodynamics; the spontaneity of biochemical reactions is expressed as ΔGo' in kJ/mol energy charge correct answers a measure of [ATP], [ADP], and [AMP] in the cell and reflects the amount of ATP for metabolic reactions The energy available from redox reactions due to what? ...

Tyr122 is important in the mechanism of the E. coli ribonucleotide reductase. The function of this amino acid in the mechanism is to carry out a nucleophilic attack on the substrate. coordinate water in the active site. generate the Cys439 radical species. hydrogen-bond to the phosphates of the substrate. correct answers generate the Cys439 radical species. Which of the following is the reaction for nitric oxide synthase? citrulline + NO + 1.5 NADP+ L-arginine + 1.5 NADPH + H+ + 2O2 ...

What would be the effect of a mutation in the HIV-1 reverse transcriptase gene that decreased the rate of mismatches? correct answers Any decrease in the error rate of HIVRT would result in an overall decrease in the rate of viral mutations. This would probably not be an advantage for the virus, as the relatively high error rate often helps to thwart the use of antiviral drugs. Approximately how many ATP are required by helicase for the replication of the E. coli chromosome? correct answers B...

Bioc 385 Exam 1 Review Questions & Detailed Answers

The Biosphere 2 project, in Tucson, Arizona, was an experiment involving a large sealed terrarium with humans and photosynthetic plants living in balance. Why did the project have to be interrupted after only a few months? Levels of CO2 rose to dangerous levels. The humans ran out of food. The plants stopped producing oxygen. The rate of photosynthesis was too high correct answers Levels of CO2 rose to dangerous levels The __________ is driven directly by photo- ns from the sun in photo...

The amount of cholesterol in cell membranes varies from ~40% of lipids in the ______________ membrane to ~10% of lipids in the __________________ membranes correct answers The amount of cholesterol in cell membranes varies from ~40% of lipids in the plasma membrane to ~10% of lipids in the endoplasmic reticulum membranes What do high local concentrations of cholesterol do to phospholipids and membrane fluidity? correct answers prevent lateral movement of phospholipids and decrease membrane fl...

BIOC 385 Exam 1 Questions & Answers (100% Accurate Answers) 2024 update

BIOC 385 Exam 1 Questions & Answers (100% Accurate Answers) 2024 update

The Light Harvesting Complex (LHC) molecules are arranged to facilitate correct answers Resonance energy transfer to the reaction center Which statement below best describes the glycoconjugate structure of bacterial cell walls? correct answers Peptidoglycans with multiple strands of hexosamine polysaccharide chains linked together. What is the energy source for sustaining the electrochemical proton gradient in chloroplasts; what is the biochemical function of this gradient? correct answer...