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| October 22, 2018

CHAPTER 15 ENZYMES1. Which of the following will cause the rate of enzyme activity to increase linearly?a.b.c.d.increasingincreasingincreasingincreasingthethethetheenzyme concentrationsubstrate concentrationtemperaturepH2. Which of the following will the cause the rate of enzyme activity to first increase and then leveloff?a.b.c.d.increasingincreasingincreasingincreasingthethethetheenzyme concentrationsubstrate concentrationtemperaturepH3. Which of the following can cause enzyme activity to either increase or decrease?a. changing the temperatureb. changing the pHc. both a and bd. neither a nor b4. Which of the following can cause enzyme activity to either increase or decrease?a.b.c.d.increasing the substrate concentrationchanging the pHboth a and bneither a nor b5. In which type of inhibition is it possible to restore the maximum rate of enzyme activity byadding additional substrate?a. cooperative inhibitionb. competitive inhibitionc. noncompetitive inhibitiond. selective inhibition6. In which type of inhibition is it not possible to restore the maximum rate of enzyme activity byadding additional substrate?a. cooperative inhibitionb. competitive inhibitionc. noncompetitive inhibitiond. selective inhibition7. Which of the following is often true of the active site of an enzyme?a.b.c.d.It consists of amino acids near both the N-terminus and C-terminus.It consists of amino acids which are adjacent to each other.It consists of amino acids which not adjacent to each other.None of the above is true.8. Consider the following reaction.Which classification would be correct for the enzyme that catalyzes this reaction?a. oxidoreductaseb. isomerasec. transferased. ligasee. hydrolase9. Consider the following image depicting enzyme behavior.Which of the following correctly characterizes the components of this model?a. A – enzyme, B – substrate, C – active site, D – E-S complexb. A – substrate, B – active site, C – enzyme, D – E-S complexc. A – active site, B – substrate, C – E-S complex, D – enzymed. A – substrate, B – enzyme, D – E-S complex, D – active site10. Examine the following graph.Which of the following explains why the line on the graph does not continue in a linearfashion?a. All of the added substrate is bound to the enzyme.b. All of the enzyme active sites are occupied.c. The amount of enzyme present is greater than needed by the substrate.d. An inhibitor is present.CHAPTER 16 CHEMICAL COMMUNICATIONS: NEUROTRANSMITTERS AND HORMONES1. Which of the following is the hair-like part of a nerve cell?a. the axonb. a dendritec. the synapsed. the vesicle2. What name is used from the gap between the tip of a nerve cell and its target?a. axonb. dendritec. synapsed. vesicle3. Which of the following is used to characterize a material as either a neurotransmitter or ahormone?a. its chemical compositionb. its physiological behaviorc. both a and bd. either a or b4. Which of the following hormones is not produced in the pancreas?a.b.c.d.insulinglucagonreninNone, they are all produced in the pancreas.5. By which of the following mechanisms do steroid hormones cross plasma membranes?a. active transportb. diffusionc. both a and bd. neither a nor b6. Which of the following is true of the receptors for steroid hormones?a.b.c.d.They are hydrophobic.They are proteins.both a and bneither a nor b7. Which number represents the axon?a.b.c.d.12348. Which number represents the dendrites?a.b.c.d.12349. Which of the following distinguishes a neurotransmitter from a hormone?a.b.c.d.thethethethediversity of compounds in the classificationchemical structure of the compoundssource of the compounddistance over which it acts10. Which of the following correctly classifies the following chemical messenger?a.b.c.d.cholinergicamino acidandrogenicpeptidergicCHAPTER 17 NUCLEOTIDES, NUCLEIC ACIDS, AND HEREDITY1. Ribosomes are made up of how many subunits?a. 1b. 2c. 3d. 42. Which of the following is true of the lagging strand?a.b.c.d.ItItItItisisisisproducedproducedproducedproducedmore rapidly than the leading strand.at the same rate as the leading strand.continuously.discontinuously.3. Which of the following is true of the two daughter strands of DNA?a. They are both synthesized continuously.b. They are both synthesized discontinuously.c. The lagging strand is synthesizes continuously, but the leading strand is synthesizeddiscontinuously.d. The leading strand is synthesizes continuously, but the lagging strand is synthesizeddiscontinuously.4. Why is replication called semiconservative?a.b.c.d.Only some of the leading strand is conserved.Only some of the lagging stand is conserved.Each new molecule of DNA contains one template stand and one daughter strand.All of the above are correct.5. Which of the following is true of primers that are used by the cell during DNA replication?a.b.c.d.TheyTheyTheyTheyarearearearemade out of DNA.made out of RNA.made out of either DNA or RNA.proteins.6. Which type of enzyme is important in DNA fingerprinting?a. helicasesb. ligasesc. proteasesd. restriction enzymes7. Which of the following experimental techniques is used in DNA fingerprinting?a. centrifugationb. diffractionc. electrophoresisd. inking8. Which of the following correctly classifies this substance?a.b.c.d.e.nucleic acidnucleosidenucleotidepurine basepyrimidine base9. Which of the following correctly classifies this substance?a.b.c.d.e.nucleosidenucleotidenucleic acidpurine basepyrimidine base10. Which of the following correctly gives the letter sequence that would replace the numbers 1 – 4,respectively, in the following segment of DNA?a.b.c.d.AGTCTCAGUCAGCTGACHAPTER 18 GENE EXPRESSION AND PROTEIN SYNTHESIS1. Which of the following is true of mutations?a.b.c.d.They will always cause a genetic disease.They are always fatal.They are never fatal.Some are harmless and some quite dangerous.2. Which type of radiation is capable of causing a mutation?a. microwavesb. radio wavesc. ultraviolet lightd. all of these3. Which of the following describes a plasmid?a.b.c.d.It is a circular loop of double stranded DNA.It is a left handed double helix of DNA.It is a single stranded DNA.None of these is correct.4. Restriction endonucleases do which of the following?a.b.c.d.cleave DNA at very specific locations based on the sequence of baseslimit which bases can be at the ends of a strand of DNAremove specific codons DNAremove specific exons from DNA5. How many sticky ends are produced if a certain restriction endonuclease cleaves a plasmid atthree different locations ?a. 3b. 6c. 8d. 96. The restriction endonuclease TaqI recognizes the sequence TCGA and cuts it between T and Con both strands. What sticky ends will be produced when TaqI cuts the sequence whichfollows?a.c.b.d.7. The restriction endonuclease EcoRI recognizes the sequence GAATTC and cuts it between Gand A on both strands. What sticky ends will be produced when EcoRI cuts the sequencewhich follows?a.c.b.d.8. The following block diagram is a representation of the general cases of the central dogma ofmolecular biology.Which of the following correctly assigns a name to the numbered boxes?a. 1- DNA, 2-RNA, 3-Proteinc. 1-RNA, 2-DNA, 3-Proteinb. 1-Protein, 2-RNA, 3-DNAd. 1-DNA, 2-Protein, 3-RNA9. The following generalized reaction is used in one of the techniques for synthesizingrecombinant DNA.What type of enzyme is needed for reaction?a. DNA ligasec. peptidyl transferaseb. restriction endonucleased. DNA synthetase10. Consider the following image.Which of the following substances has this structure?a. mRNAb. tRNAc. rRNA

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