BS 161 FINAL EXAM questions with answers,

BS 161 FINAL EXAM questions with
|\ |\ |\ |\ |\ |\




answers

In a single molecule of water, two hydrogen atoms are bonded to
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


a single oxygen atom by - CORRECT ANSWERS ✔✔polar covalent
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\


bonds
|\




The negative logarithmic of the hydrogen ion concentration in
|\ |\ |\ |\ |\ |\ |\ |\ |\


the solution is referred to as - CORRECT ANSWERS ✔✔pH
|\ |\ |\ |\ |\ |\ |\ |\ |\




When are atoms most stable? - CORRECT ANSWERS ✔✔when all
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\


of the electron orbitals in the valance shell are filled
|\ |\ |\ |\ |\ |\ |\ |\ |\




The structural formula for a certain molecule includes a group
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\


symbolized -O. The dash next to the oxygen atom means that a
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


single bond exists to another atom, such as a carbon. Based on
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


the valence of oxygen and the number of bonds it normally
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


forms, what is the charge on the oxygen atom in this case? -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


CORRECT ANSWERS ✔✔ |\ |\




Two carbon atoms joined to each other by sharing of two pairs of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


electrons form a(n): - CORRECT ANSWERS ✔✔ionic bond
|\ |\ |\ |\ |\ |\ |\




Plants transport water to their leaves through the xylem when
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\


water evaporates from the leaves. The evaporating water pulls
|\ |\ |\ |\ |\ |\ |\ |\ |\


other water molecules up the xylem through - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\


ANSWERS ✔✔ |\

,Membrane lipids contain long chains of H-C-H groups joined by C-
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\


C bonds. Which interaction is most likely to occurring between
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\


lipids in the membrane? - CORRECT ANSWERS ✔✔van der waals
|\ |\ |\ |\ |\ |\ |\ |\ |\




Consider the following electronegativity values: Boron=1.8;
|\ |\ |\ |\ |\ |\


Carbon=2.5; Chlorine=3.2; Selenium= 2.6. Which bond is the |\ |\ |\ |\ |\ |\ |\ |\


most polar? - CORRECT ANSWERS ✔✔B-Cl
|\ |\ |\ |\ |\




Which of the following best summarizes the relationship between
|\ |\ |\ |\ |\ |\ |\ |\


dehydration reactions and hydrolysis? - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\


✔✔Dehydration reactions assemble polymers, and hydrolysis |\ |\ |\ |\ |\ |\


reactions break down polymers. |\ |\ |\




Which of the following polymers contain(s) nitrogen? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\


ANSWERS ✔✔Chitin |\




The molecular formula for glucose is C6H12O6. What would be
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\


the molecular formula for a molecule made by linking three
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\


glucose molecules together by dehydration reactions? - CORRECT
|\ |\ |\ |\ |\ |\ |\


ANSWERS ✔✔C18H32O16
|\ |\




It became apparent to Watson and Crick after completion of their
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\


model that the DNA molecule could carry a vast amount of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


hereditary information in which of the following? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\


ANSWERS ✔✔Sequence of bases |\ |\ |\




What is meant by the description "antiparallel" regarding the
|\ |\ |\ |\ |\ |\ |\ |\ |\


strands that make up DNA? - CORRECT ANSWERS ✔✔The 5' to 3'
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\

,direction of one strand runs counter to the 5' to 3' direction of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


the other strand
|\ |\




If you made a change in the promoter sequence in the DNA that
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


inactivates the promoter, what would happen at the RNA level? - |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


CORRECT ANSWERS ✔✔The RNA polymerase would not be able |\ |\ |\ |\ |\ |\ |\ |\ |\


to recognize and bind the DNA, so no RNA would be made
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\




The genetic code is essentially the same for all organisms. From
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


this, one can logically assume which of the following? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


ANSWERS ✔✔A gene from an organism can theoretically be |\ |\ |\ |\ |\ |\ |\ |\ |\


expressed by any other organism |\ |\ |\ |\




Imagine you have discovered a new species of bacteria. To begin
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


your investigation of this organism, you run an assay on the total
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


nucleotide content of the bacterial DNA. If the cytosine content
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


of DNA from the bacterial cells is 40%, what is the adenine
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


content? - CORRECT ANSWERS ✔✔10% |\ |\ |\ |\




Which of the following does not occur in prokaryotic eukaryotic
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\


gene expression, but does in eukaryotic gene expression? -
|\ |\ |\ |\ |\ |\ |\ |\ |\


CORRECT ANSWERS ✔✔a Poly-A tail is added to the 3' end of an
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


mRNA and a cap is added to the 5' end|\ |\ |\ |\ |\ |\ |\ |\ |\




The Dystrophin gene is 2.3 million nucleotides long, however it
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\


only uses ~12,00 nucleotides to make a protein consisting of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\


3,685 amino acids. This is best explained by the fact that -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


CORRECT ANSWERS ✔✔ |\ |\

, Accuracy in the translation of mRNA into the primary structure of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\


a polypeptide depends on specificity in the: - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\


ANSWERS ✔✔Bonding of the anticodon to the codon and the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\


attachment of amino acids to tRNAs |\ |\ |\ |\ |\




Streptomycin is an antibiotic that interferes with the function of |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


the large subunit of the prokaryotic ribosome. What is the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\


consequence of treating bacteria with streptomycin. - CORRECT |\ |\ |\ |\ |\ |\ |\ |\


ANSWERS ✔✔impaired protein synthesis |\ |\ |\




DNA template strand 5'-------------3'
|\ |\ |\ |\




DNA complementary strand 3'----------5'
|\ |\ |\




Given the locally unwound double strand above, in which
|\ |\ |\ |\ |\ |\ |\ |\ |\


direction does the RNA polymerase move? - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\


✔✔3' --> 5' along the template strand
|\ |\ |\ |\ |\ |\




In the transcription event of the previous DNA, where would the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


promoter be located? - CORRECT ANSWERS ✔✔To the right of the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\


template strand
|\ |\




What enzyme catalyzes the attachment of an amino acid to
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\


tRNA? - CORRECT ANSWERS ✔✔aminoacyl-tRNA synthetase
|\ |\ |\ |\ |\




Osmosis occurs as water can cross the lipid bilayer through
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\


specialized channels for water movement called ________. -
|\ |\ |\ |\ |\ |\ |\ |\


CORRECT ANSWERS ✔✔aquaporins |\ |\