18. The nose is_ to the mouth. a. posterior b. inferior c. superior d. superfici
ID: 199454 • Letter: 1
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18. The nose is_ to the mouth. a. posterior b. inferior c. superior d. superficial 19. Sodium has an atomic number of 11 and an atomic mass of 23. Sodium has a. 12 neutrons and 11 protons. b. 12 protons and 11neutrons c. 12 electrons and 11 neutrons d. 12 protons and 11 electrons 20. Oxygen has an atomic number of eight. When two oxygen atoms come together, they form a(n) a. hydrogen b. nonpolar covalent bond. c. polar covalent d. ionic 21. What type of bond attracts one water molecule to another a. an ionic bond b. a peptide bond c. a hydrogen bond d. a covalent bond 22. Isotopes are atoms with the same number but different numbers. a. mass, atomic b. proton; electrons c. ncutrons; protons d. atomic; mass 23. Which of these has the highest II" concentration? 24. A solution that resists a change in phi when acid or base is added to it is 25. Which of the following statements is/are true regarding ATP a. Lemon juice, pll-2.3 b. Red wine, pH = 3.2 c. tomato juice, pH-4.7 d. saliva, pH-6.6 a. a catalyst b. a buffer c. a reducing agent. d. an oxidizing agent. a. It is the body's primary source of chemical energy b. Its production is the main reason humans breathe oxygen. c. It is produced through the oxidation of molecular fuels like glucose. d. All of the above statements are true. 26. Which of the following is not part of a nucleotide? a. An amino acid b. A nitrogenous basc c. One or more phosphate groups d. A sugar bound to 27, Triglycerides are molecules consisting of one 3-carbon compound called three a. steroid; glycerols b. steroid; fatty acids c. a fatty acid; glycerol d. glycerol; fatty acidsExplanation / Answer
18) Nose is (c) Superior to mouth( which means higher in position)
19) a) Sodium has 12 neutrons ( atomic mass - no of protons) and 11 protons.
20) b) When 2 oxygen atoms come together they form a nonpolar covalent bond ( a bond formed by sharing of electrons with zero polarity).
21) c) A hydrogen bond attracts one water molecule towards another.
22) d) isotope have same atomic number but different mass number.
23) a) Lemon juice with pH=2.3 , lowest pH has highest concentration of H+ ions.
24) b) A buffer is solution that resist change in pH on addition of acid or base.
25) d) all the above are function of ATP.
26) a) Nucleotide is made up of nitrogenous bases+pentose sugar+ phosphate group.
27) d) Triglycerides is made up of glycerol and fatty acids.
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