BS 161 FINAL EXAM questions with verified answers
A correct flow of electrons in photosynthesis is: Ans✓✓✓ H2O --> photosystem II
--> photosystem I --> NADPH + H+.
A covalent chemical bond is one in which Ans✓✓✓ outer-shell electrons of two
atoms are shared so as to satisfactorily fill the outer electron shells of both atoms.
A flask containing photosynthetic green algae and a control flask containing water
with no algae are both placed under a bank of lights, which are set to cycle
between 12 hours of light and 12 hours of dark. The dissolved oxygen
concentrations in both flasks are monitored. Predict what the relative dissolved
oxygen concentrations will be in the flask with algae compared to the control
flask. Ans✓✓✓ The dissolved oxygen in the flask with algae will be higher in the
light, but lower in the dark
A molecule with the chemical formula C16H32O16 is probably a Ans✓✓✓
carbohydrate
A mutant bacterial cell has a defective aminoacyl tRNA synthetase that attaches a
lysine to tRNAs with the anticodon AAA instead of the normal phenylalanine. The
consequence of this for the cell will be that Ans✓✓✓ proteins in the cell will
include lysine instead of phenylalanine at amino acid positions specified by the
codon UUU.
A nucleotide is made up of which of the following subunits? Ans✓✓✓ a 5-carbon
sugar, a phosphate group, and a nitrogenous base
A number of systems for pumping ions across membranes are powered by ATP.
Because small increases in calcium ions in the cytosol can trigger a number of
,different intracellular reactions, cells keep the cytosolic calcium concentration
quite low under normal conditions, using ATP-powered calcium pumps. For
example, muscle cells transport calcium from the cytosol into the membranous
system called the sarcoplasmic reticulum (SR). If a resting muscle cell's cytosol has
a free calcium ion concentration of 10-7 while the concentration in the SR is 10-2,
then how is the ATPase acting? Ans✓✓✓ ATPase activity must be pumping
calque, from the cytosol to the SR against the concentration gradient
A peptide has the sequence NH2- phe- pro- lys- gly- phe- pro- COOH. Which of the
following sequences in the coding strand of the DNA could code for this peptide?
Ans✓✓✓ 5' TTT- CCC- AAA- GGG- TTT- CCC NOTE: Coding strand is the NON-
template strand. Scientists call it the coding strand because it matches (is the
same as the RNA strand except T instead of U's).
A peptide has the sequence NH2- phe- pro- lys- gly- phe- pro- COOH. Which of the
following sequences in the non-template strand of the DNA codes for this
peptide? Ans✓✓✓ 5' TTT- CCC- AAA- GGG- TTT- CCC
A phospholipid molecule in a membrane can: Ans✓✓✓
A possible sequence of nucleotides in the template strand of DNA that would
code for the polypeptide sequence phe- leu- ile- val would be Ans✓✓✓ 3' AAA-
GAA- TAA- CAA 5'.
A solution of starch at room temperature does not readily decompose to form a
solution of simple sugars because Ans✓✓✓ the activation energy barrier for this
reaction cannot be surmounted
, Accuracy in the translation of mRNA into the primary structure of a polypeptide
depends on specificity in the: Ans✓✓✓ Bonding of the anticodon to the codon
and the attachment of amino acids to tRNAs
Accuracy in the translation of mRNA into the primary structure of a protein
depends on specificity in the Ans✓✓✓ binding of ribosomes to mRNA
bonding of the anticodon to the codon
All of the following nitrogenous bases are found in DNA except
A) uracil. B) cytosine. C) guanine. D) thymine. E) adenine. Ans✓✓✓ uracil
Although there are a few exceptions, the direction of transfer of genetic
information in almost all living things is as follows: Ans✓✓✓ DNA → mRNA →
protein
As a ribosome translocates along an mRNA molecule by one codon, which of the
following occurs? Ans✓✓✓ the tRNA that was in the A site moves into the P site
the tRNA that was in the P site moves to the E site and is released
As electrons travel along the electron transport chain in mitochondria, protons
are pumped from the __________ to the ________________. Ans✓✓✓ matrix;
inter membrane space
Carbon skeletons for amino acid biosynthesis are supplied by intermediates of the
citric acid cycle. Which intermediate would supply the carbon skeleton for
synthesis of a five-carbon amino acid? Ans✓✓✓ α-ketoglutarate
A correct flow of electrons in photosynthesis is: Ans✓✓✓ H2O --> photosystem II
--> photosystem I --> NADPH + H+.
A covalent chemical bond is one in which Ans✓✓✓ outer-shell electrons of two
atoms are shared so as to satisfactorily fill the outer electron shells of both atoms.
A flask containing photosynthetic green algae and a control flask containing water
with no algae are both placed under a bank of lights, which are set to cycle
between 12 hours of light and 12 hours of dark. The dissolved oxygen
concentrations in both flasks are monitored. Predict what the relative dissolved
oxygen concentrations will be in the flask with algae compared to the control
flask. Ans✓✓✓ The dissolved oxygen in the flask with algae will be higher in the
light, but lower in the dark
A molecule with the chemical formula C16H32O16 is probably a Ans✓✓✓
carbohydrate
A mutant bacterial cell has a defective aminoacyl tRNA synthetase that attaches a
lysine to tRNAs with the anticodon AAA instead of the normal phenylalanine. The
consequence of this for the cell will be that Ans✓✓✓ proteins in the cell will
include lysine instead of phenylalanine at amino acid positions specified by the
codon UUU.
A nucleotide is made up of which of the following subunits? Ans✓✓✓ a 5-carbon
sugar, a phosphate group, and a nitrogenous base
A number of systems for pumping ions across membranes are powered by ATP.
Because small increases in calcium ions in the cytosol can trigger a number of
,different intracellular reactions, cells keep the cytosolic calcium concentration
quite low under normal conditions, using ATP-powered calcium pumps. For
example, muscle cells transport calcium from the cytosol into the membranous
system called the sarcoplasmic reticulum (SR). If a resting muscle cell's cytosol has
a free calcium ion concentration of 10-7 while the concentration in the SR is 10-2,
then how is the ATPase acting? Ans✓✓✓ ATPase activity must be pumping
calque, from the cytosol to the SR against the concentration gradient
A peptide has the sequence NH2- phe- pro- lys- gly- phe- pro- COOH. Which of the
following sequences in the coding strand of the DNA could code for this peptide?
Ans✓✓✓ 5' TTT- CCC- AAA- GGG- TTT- CCC NOTE: Coding strand is the NON-
template strand. Scientists call it the coding strand because it matches (is the
same as the RNA strand except T instead of U's).
A peptide has the sequence NH2- phe- pro- lys- gly- phe- pro- COOH. Which of the
following sequences in the non-template strand of the DNA codes for this
peptide? Ans✓✓✓ 5' TTT- CCC- AAA- GGG- TTT- CCC
A phospholipid molecule in a membrane can: Ans✓✓✓
A possible sequence of nucleotides in the template strand of DNA that would
code for the polypeptide sequence phe- leu- ile- val would be Ans✓✓✓ 3' AAA-
GAA- TAA- CAA 5'.
A solution of starch at room temperature does not readily decompose to form a
solution of simple sugars because Ans✓✓✓ the activation energy barrier for this
reaction cannot be surmounted
, Accuracy in the translation of mRNA into the primary structure of a polypeptide
depends on specificity in the: Ans✓✓✓ Bonding of the anticodon to the codon
and the attachment of amino acids to tRNAs
Accuracy in the translation of mRNA into the primary structure of a protein
depends on specificity in the Ans✓✓✓ binding of ribosomes to mRNA
bonding of the anticodon to the codon
All of the following nitrogenous bases are found in DNA except
A) uracil. B) cytosine. C) guanine. D) thymine. E) adenine. Ans✓✓✓ uracil
Although there are a few exceptions, the direction of transfer of genetic
information in almost all living things is as follows: Ans✓✓✓ DNA → mRNA →
protein
As a ribosome translocates along an mRNA molecule by one codon, which of the
following occurs? Ans✓✓✓ the tRNA that was in the A site moves into the P site
the tRNA that was in the P site moves to the E site and is released
As electrons travel along the electron transport chain in mitochondria, protons
are pumped from the __________ to the ________________. Ans✓✓✓ matrix;
inter membrane space
Carbon skeletons for amino acid biosynthesis are supplied by intermediates of the
citric acid cycle. Which intermediate would supply the carbon skeleton for
synthesis of a five-carbon amino acid? Ans✓✓✓ α-ketoglutarate
