BIOL 111 FINAL TAMU – FLETCHER QUESTIONS AND ANSWERS 100% SOLVED

BIOL 111 FINAL TAMU – FLETCHER QUESTIONS AND ANSWERS 100% SOLVED The element present in all organic molecules is Carbon Cell membranes have distinct inside and outside faces. Which of the following statements is the most likely explanation for the membrane's asymmetrical nature? The two sides of a cell membrane face different environments and carry out different functions Which of the following statements is true about buffer solutions? They maintain a relatively constant pH when either acids or bases are added to them When are most atoms stable? When all of the electron orbitals in the valence shell are filled Which two functional groups are always found in amino acids? Carboxyl and amino groups Nitrogen (N) is more electronegative than hydrogen (H). Which of the following is a correct statement about the atoms in ammonia (NH3)? Each hydrogen atom has a partial positive charge; the nitrogen atom has a partial negative charge Which of the following is a major difference between RNA and DNA? Type of sugar Saturated fats ________ Contain more hydrogen than unsaturated fats that consist of the same number of carbon atoms What component of amino acid structure varies among different amino acids The components of the R group The relation between amino acid and polypeptide is similar to the relation between _________ Nucleotide and nucleic acid Which of the following is considered to be a strong base (alkali)? NaOH → Na⁺ + OH⁻ Which statement about the sodium - potassium pump is false? It is considered a symporter For a protein to be an integral membrane protein, it would have to be _________ amphipathic, with at least one hydrophobic region About 25 of the 98 natural elements are known to be essential to life. Which 4 of these 25 elements make up approximately 96% of living matter? Carbon, hydrogen, nitrogen, oxygen Which of the following statements correctly describes osmosis? In osmosis, water moves across a membrane from areas of lower solute concentration to areas of higher solute concentration Which of the following is broken when water evaporates? Hydrogen bonds What element does not prefer to react with other elements? Neon How much sodium carbonate (Na2CO3) would it take to make 1000mL of a 2M solution? 104g What kinds of molecules pass through a cell membrane most easily? Small and hydrophobic If one strand of a DNA molecule has the sequence of bases 5'-ATTGCA-3', the mRNA synthesized following the template will be _____ __ 3'-UAACGU-5' Which is false regarding alpha helices and beta pleated sheets? A beta pleated sheet forms a covalent bond between atoms on the backbone of the polypeptide Which of the following molecules dramatically increases the rate of diffusion of water across cell membranes? Aquaporins What is the difference between covalent bonds and ionic bonds? Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the transfer of electrons between charged atoms The molecule illustrated in the figure _________ will be liquid at room temperature Which of the following best summarizes the relationship between dehydration synthesis and hydrolysis? Dehydration synthesis reactions assemble polymers; hydrolysis reactions break polymers apart The membranes of winter wheat are able to remain fluid when extremely cold by ___________ Increasing the percentage of cholesterol molecules in the membrane Which two amino acids are known to have variable polarity? Proline and tyrosine What