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Walden PUBH6170 week 2 quiz




Question;Question 1Which of the following is true regarding active transport?AnswerActive transport requires energyMolecules are moved across a plasma membrane from an area of higher concentration to an area of lower concentration.Active transport relies on the process of diffusion.Molecules to be transported attach to phospholipids in the plasma membrane, as the phospholipids change shape, the molecules are moved across the membrane.This mechanism allows a cell to equalize the concentration of molecules on either side of the plasma membrane.1 points Question 2A codon is:Answera type of DNA repair enzyme.a promoter that prevents the attachment of RNA polymerase.a sequence of three nitrogenous bases on mRNA that corresponds to an amino acid.the part of the ribosome to which mRNA attaches.a sequence of three nitrogenous bases on tRNA that corresponds to an amino acid.1 points Question 3Despite the positive effects of liposuction, research indicates that regular exercise and dieting are the best ways to lose body weight.AnswerTrueFalse1 points Question 4Which of the following is not true regarding liposuction?AnswerComplications include drug reactions, ultrasound burns, and blood clots.Liposuction has proven to be just as beneficial to the health of an individual as losing the equivalent amount of weight through exercise and diet.Liposuction is a fast way to lose weight and shape the body.Liposuction is used to permanently remove localized bodies of fat.A current development in liposuction involves the use of ultrasound which is used to break open the walls of the fat cells.1 points Question 5During DNA replication, complementary nucleotides are added to the separated strands of the original DNA by enzymes. Which of the following bases would a nucleotide contain if it were paired to a nucleotide containing thymine?Answeradenineuracilanother thyminecytosineguanine1 points Question 6Although a specific codon specifies only one amino acid, several different codons can specify the same amino acid.AnswerTrueFalse1 points Question 7Immediately after a meal, which of the following is first used by cells as an energy source?Answerfatglycogenlactic acidamino acidsglucose1 points Question 8Which of the following is not true regarding receptor proteins?AnswerThey are used to receive and transmit information across the plasma membrane.All cells have the same receptor proteins.When a receptor protein binds to a molecule, a series of biochemical reactions occur that eventually cause changes to occur in the cell.The molecule that binds to a receptor protein does not enter the cell.Receptor proteins bind to a specific molecule or group of molecules.1 points Question 9During cell division, it is essential that the genetic material be distributed equally to the resulting cells. This is accomplished through the participation of which of the following organelles?AnswercentriolesribosomesperoxisomesGolgi apparatusnucleolus1 points Question 10Which of the following is true regarding glial cells?Answerlocated in the matrix of cartilagetransmit nerve impulses from the brain to the internal organsstimulate the contraction of cardiac musclesupport and protect neuronsproduce blood plasma1 points Question 11Muscle cells require more energy in order to function than most other cells. Therefore, muscle cells would be expected to have more ________ than most other cells.Answermitochondriacell membraneslysosomescentriolesGolgi apparatus1 points Question 12Vasoconstriction is a term that refers to the contraction of muscle in the walls of the blood vessels, thus causing the diameter of the blood vessel to decrease. Which of the following types of muscle would be involved in this contraction?Answerskeletalsmoothcardiacboth cardiac and smoothboth skeletal and smooth1 points Question 13The processes of initiation, elongation, and termination that occur in the production of a protein are all associated with:AnswerDNA replication.processing of a fat in the endoplasmic reticulum.correction of a mutation.formation of an intact ribosome.translation.1 points Question 14Which of the following is not a function of the skin?Answerproduction of vitamin Dstorage of calciumprotection from dehydrationdefense from microorganismsregulation of body temperature1 points Question 15Mutations in our DNA rarely impair normal cell function becauseAnswerrepair of DNA prevents all mutations from ever causing damage to a cell.damaged cells will commit "suicide" to prevent damage to the body.cells have one major repair enzyme that corrects the mutations quickly.multiple DNA repair enzymes usually quickly correct the mutations before any damage can occur.the cells attack disfunctional gene products, averting damage to a cell.


Paper#62980 | Written in 18-Jul-2015

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