g. An element with 12 neutrons, 14 A. 14 B. 26 C. 28 D. cannot be determined E.
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g. An element with 12 neutrons, 14 A. 14 B. 26 C. 28 D. cannot be determined E. two of the choices are correct. protons, and 14 electrons would have a mass number of a net charge of +1 and is an isotope. strue regarding an atom of hydrogen that has 1 proton, 15 neutrons, and no electrons B. it has a net charge of +1 and is the regular element C. it has a net charge of -1 and is an isotope. D. it has a net charge of -1 and is the regular element. E. two of the choices are correct 1 1 . The pH of a solution increases as the A. hydrogen B. hydroxide C. bicarbonate D. sodium E. two of the choices are correct. 12. In an acidic solution, A. the OH ion concentration is greater than the H ion concentration. B. the OH ion concentration is less than the H' ion concentration. C. the H' ion concentration is equal to the OH ion concentration. D. the H' ion concentration is less than the OH ion concentration only if the solution is buffered. E. two of the choices are correct 13. Progeria, the condition of accelerated aging, is a type of mutation that results in the production of a single nucleotide change where the codon brings in a different amino acid for the polypeptide chain. A. This is indicative of a problem due to the DNA helical structure. B. This is indicative of a problem due to translation from RNA. C. This is indicative of a problem due to transcription from RNA. D. This is indicative of a problem due to the RNA helical structure. E. two of the choices are correct. 14. Regarding acids and bases A. acids will increase the pH of a solution. B. bases will decrease the pH of a solution. C. acids will accept hydrogen ions in a solution. D. bases will accept hydrogen ions in a solution. E. two of the choices are correct. 15. Which of the following is NOT true of unsaturated fatty acids? A. They contain one or more double bonds. B. They are usually liquid at room temperature. C. They contain a maximal number of hydrogen atoms. D. They contain less than the maximum number of hydrogen atoms. E. two of the choices are correct. A. They are glycolipids originally isolated from the prostate gland. B. They are major components of the cell membrane. 16. Which of the following is NOT true of phospholipids? C. They have a polar head and a nonpolar tail. D. They are amphipathic molecules. E. two of the choices are correctExplanation / Answer
9. Option [B] 26
Reason -- Mass no. of an atom is the sum of the no. of protons and neutrons it has in its nucleus.
Here, for this atom, it is 14+12 = 26
10. Option [A] Has a net charge of +1 and is an isotope.
Reason- Since the atom has one proton and no electron so it will have a positive charge. There is no electron [- charge] to neutralise it.
11. Option [A] Hydrogen
Reason-- Acids give H^+ ions in solution . The stronger the acid, the greater will be the hydrogen ion concentration.
Bases give OH^- ions in solution. The stronger the base, the higher will be its hydroxide concentration.
The pH ranges from 1 to 14.
A solution is called neutral if its pH is 7. If the pH is less than 7, the solution is acidic. If the pH is more than 7, the solution is basic. So , if the pH of a solution is increasing, its hydrogen ion concentration is decreasing.
12. Option [B] the OH^- ion concentration is less than H^+ ion concentration.
Reason is the same as explained in answer 11.
13. Option [C] This is indicative of a problem due to transcription from RNA.
Transcription is the process of copying genetic information from one strand of DNA into RNA. The process of complementarity governs this process.
Progeria is a disease caused by a single point mutation in which only one base pair is diffective leading to the condition of premature aging in children . During transcription, if the RNA carries wrong information, the base pairing is disturbed and the disease occurs
14] Option [D] Bases will accept hydrogen ions in solution.
Reason -- Bases are neutralised by acids in solution. They hace OH^- ions which readily accept the H^+ ion to form water.
15. Option [C] They contain the maximal number of hydrogen atoms.
Reason- Unsaturated fatty acids have one or more double bonds between the carbon atoms. This means that the carbon compound can accept more hydrogen atoms so that all the carbon atoms have a single bond between them.
16. Option [A] They are glycolipids originally isolated from the prostrate gland.
Reason- They are phospholipids having a polar head and a non polar tail. They make up the cell membrane and are amphiphathic in nature.
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