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BIOL 111 FINAL TAMU - FLETCHER QUESTIONS AND ANSWERS
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BIOL 111 FINAL TAMU - FLETCHER
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BIOL 111 FINAL TAMU - FLETCHERThe element present in all organic molecules is - answer 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? -
answer 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? - answer They maintain
a relatively constant pH when either acids or bases are added to them
When are most atoms stable? - answer When all of the electron orbitals in the valence
shell are filled
Which two functional groups are always found in amino acids? - answer 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)? - answerEach 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? - answerType of
sugar
Saturated fats ________ - answerContain 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 -
answerThe components of the R group
The relation between amino acid and polypeptide is similar to the relation between
_________ - answerNucleotide and nucleic acid
Which of the following is considered to be a strong base (alkali)? - answerNaOH → Na⁺
+ OH⁻
Which statement about the sodium - potassium pump is false? - answerIt is considered
a symporter
For a protein to be an integral membrane protein, it would have to be _________ -
answeramphipathic, 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? - answerCarbon, hydrogen,
nitrogen, oxygen
Which of the following statements correctly describes osmosis? - answerIn 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? - answerHydrogen bonds
What element does not prefer to react with other elements? - answerNeon
How much sodium carbonate (Na2CO3) would it take to make 1000mL of a 2M
solution? - answer104g
What kinds of molecules pass through a cell membrane most easily? - answerSmall 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 _____
__ - answer3'-UAACGU-5'
Which is false regarding alpha helices and beta pleated sheets? - answerA 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? - answerAquaporins
What is the difference between covalent bonds and ionic bonds? - answerCovalent
bonds involve the sharing of electrons between atoms; ionic bonds involve the transfer
of electrons between charged atoms
The molecule illustrated in the figure _________ - answerwill be liquid at room
temperature
Which of the following best summarizes the relationship between dehydration synthesis
and hydrolysis? - answerDehydration synthesis reactions assemble polymers;
hydrolysis reactions break polymers apart
The membranes of winter wheat are able to remain fluid when extremely cold by
___________ - answerIncreasing the percentage of cholesterol molecules in the
membrane
Which two amino acids are known to have variable polarity? - answerProline and
tyrosine
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