Density-multiple-choice-questions

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5 Quick Multiple Choice Questions

By the point (3, 1). The y term of B is: A. -6 B. -5 C. 3 D. 5 E. 9 4. The angle, a , the equation ... units E. 137.0 units 3. The line segment joining the points A (-3, 7) and B (9, y) is bisected with equation y - 3x + 4 = 0 is: y - 3x + 4 = 0 y - 3x = - 4 y = 3x - 4 gradient = 3 perpendicular...

Catalysts Multiple Choice Question

The activationenergy. B.) Decrease the energy of activation. C.) Change the path of the reaction... that catalysts can speed up reactions rates? You must check all answers that apply. A.) Increase Take a closer look at option C : If the activationenergy is lowered, this means that the reaction

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Question:1.Arteries are a. constricted by the action of noradrenaline on beta-adrenoceptors (beta- AR). b. relaxed when nitric oxide (NO) is released from nerves. c. constricted by peptides released from sensory nerves. d. only innervated by the parasympathetic, and not by the sympathetic nervous system 2.All of the following are true of noradrenaline (NA) EXCEPT a. NA is taken back up into the nerve varicosity that released it. b. NA is taken up by the smooth muscle of the effector tissue. c. NA is so efficiently taken up and destroyed that none appears in the general blood circulation. d. Released NA is recycled, repackaged and released again. 3.Which one of the following statements about the adrenal medulla is INCORRECT? a. It is located in the brain. b. It performs very similarly to an autonomic ganglion. c. The incoming nerves to the adreanal medulla release acetylcholine (ACh). d. The cells of the adrenal medulla secrete adrenaline. 4.A person is treated with a dose of atropine sufficient to block peripheral muscarinic receptors. Which ONE of the following events would occur? a. The heart would stop. b. There would be a marked increase in sympathetic activity throughout the body. c. Saliva secretion would cease. d. Blood pressure would increase markedly because vasodiltation in the skin, mediated by parasympathetic nerves, would no longer occur. 5.Which ONE of the following statements is NOT TRUE of the neurotransmitter nitric oxide (NO)? a. NO is synthesized from the amino acid L-arginine. b. NO is stored in vesicles in the terminal varicosities of autonomic nerves. c. A rise in cytoplasmic calcium is required for the synthesis of NO. d. Vascular smooth muscle is relaxed by NO.

Answers:D C A B A

Question:1) During oxidative respiration, pyruvate is converted into a) ATP b) citric acid cycle c) CO2 and acetyl-coenzyme A d) high energy electrons e) oxidized NAD+ 2) When DNA is heated gently its structure becomes disrupted. Between which parts of the molecule would the bonds break? a)adenine-thymine b)phosphate-deoxyribose c)deoxyribose-cytosine d)phosphate-guanine e)deoxyribose-deoxyribose 3) Salivary amylase is a single polypeptide chain. When the pH is lowered several pH units below its pH optimum, its activity is strongly inhibited. What factor is most responsible for the decrease in activity? a) an allosteric inhibitor b) an altered primary structure c) an altered tertiary structure d) an altered quarternary structure e) degradation of the starch substrate 3) Within the cell, many chemical reactions that, by themselves, require energy input (hae a positive free-energy change) can occur because the reactions a) may be coupled to the hydrolysis of ATP b) take place very slowly c) take place when the cells are at unusually high temperatures d) are catalyzed by enzymes e) are aided by various metal ions that act as catalysts 4) Facilitated diffusion across a cell membrane a) requires energy in the form of ATP for diffusion to occur. b) occurs in selective membrane channels c) utilizes ATP as a carrier molecule d) involves active, as opposed to passive transport e) involves lipid-soluble materials only 5) Which of the following changes is likely to have the most drastic effect on phenotype in bacteria a) single base substitution in DNA b) two-minute exposure to ultraviolet radiation from sunglight c) single DNA nucleotide deletion d) deletion of three nucleotides from DNA e) insertion of three nucleotides into DNA 6) A compound with the chemical formula C5H11COOH would be classified as a a) amino acid b) fatty acid c) nucleic acid d) carbohydrate e) steroid 7) When the substrate is bound to the enzyme, the shape of the enzyme may change slightly, leading to a) a better induced fit b) a greater range of possible catalytic activities c) a greater supply of activation energy d) more permanent binding through intimate total contact e) more possible products of the reaction 8)If the cell were encased in a complete lipid bilayer with no proteins, the membrane would be a) completely impermeable to water soluble substances b) completely permeable to water soluble substances c) completely impermeable to lipid-soluble materials d) partially permeable to water only e) permeable to sodium ions only 9) On the outer suface of a cell membrane there are markers to identify the cell type; often the molecules involved are a) ATP b) carbohydrate chains c) single glucose molecules d) sodium ions e) water 10) In most proteins, sulfur-containing amino acids form crosslinks, which tend to a) cause hydrolysis of peptide bonds b) force hydrophobic groups to the outside c) inhibit the formation of new peptide bonds d) increase the solubility of the protein e) stabilize the structure of the protein 11) One of the important first results of the light reactions is a) the addition of phosphate to sugar to form sugar phosphate b) the change of chlorophyll from green to colorless c) the chemiosmotic formation of ATP d) the rearrangeement of sugar molecules to form O2 and H2O e) the transfrer of electrons to glucose molecules

Answers:1c, 2a, 3c, 3d, 4b, 5c, 6b, 7a, 10e. Try these, sorry I don't know them all

Question:1. Which of the following groups from the periodic table combines most readily with other elements to form compounds ? a. transition metals b. alkaline earth metals c. alkali metals d. iron triad 2. Several groups contain only metals. Which group contains only non metals ? a. group 1 b. group 12 c. Group 2 d. Group 18 3. Which of the following elements is likely to be contained in a substance with a brilliant yellow color? a. chromium b. carbon c. iron d. tin 4. Which halogen is radioactive ? a. astatine b. chlorine c. bromine d. iodine 5. Which is unlikely to happen to zinc ? a. it is rolled into sheets b. it is used to coat a steel hull c. it is used in a battery d. it is used as in insulator 6. A brittle, non-conducting, solid might belong to which of the following groups? a. alkali metals b. alkaline earth metals c. actinides series d. oxygen group

Answers:1. transition metals 2. Group 18 I only know the first two, look on your periodic table for the rest or gooogle


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6. Alkenes - Multiple choice questions

Alkenes multiple choice questions suitable for AS or A-level chemistry. Part of a set of tutorials on alkenes, suitable for AS chemistry, International Baccalaureate or equivalent. Content includes bonding, shape, EZ isomerism, electrophilic addition and polymerisation.

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Multiple Choice Question Time

With Friday sittings of Parliament abandoned, the Speaker decided to experiment with new forms of Question Time. By Hugh Atkin with Judy Haddrick, John Atkin and Jeremy Atkin. hmatkin.blogspot.com A Sledge Video http


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