3795168
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Quiz von erika.roloff, aktualisiert more than 1 year ago
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Erstellt von erika.roloff
vor fast 9 Jahre
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Frage 1
Frage
all of the following are model organisms except:
Antworten
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yeast
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fruit fly
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chimpanzee
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round worm
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mustard plant
Frage 2
Frage
which of the following macromolecules are known to have catalytic functions in normal cells?
Antworten
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proteins
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DNA
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RNA
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polysaccharides
-
both proteins and RNA
Frage 3
Frage
DNA strands in the double helix are __________ which means the strand runs in opposite directions
Antworten
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base paired
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antagonists
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antiparallel
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parallel
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twisted
Frage 4
Frage
which of the following amino acids has a negatively charged side chain with a neutral pH?
Antworten
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alanine
-
aspartate
-
glutamine
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histadine
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glycine
Frage 5
Frage
which of the following is the weakest interaction?
Antworten
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H bonds
-
ionic bonds
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phospho-anhydride bonds
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van der Waals interactions
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covalent bonds
Frage 6
Frage
amphipathic refers to molecules that are:
Antworten
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hydrophillic
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hydrophobic
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non polar at both ends
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charged at both ends but with opposite charges
-
charged at one end and non polar at the other
Frage 7
Frage
which of the following is not an activated form of a monomer?
Antworten
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adenosine triphosphate
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glucose-6-phosphate
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aminoacyl tRNA
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amino acid
-
uracyl triphosphate
Frage 8
Frage
the site on an enzyme that will bind to the substrate is called:
Antworten
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prosthetic group
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catalyst
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active site
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activation site
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metastable site
Frage 9
Frage
an enzyme:
Antworten
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binds substrates in a manner that facilitates formation of a product
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decreases rate of reaction
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changes position of equilibrium in reaction
-
doesn't change rate at which equilibrium is achieved
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is always a protein
Frage 10
Frage
proteins are often composed of 2 or more distinct molecules that fold independently. This represents protein that functions in semi-independent manner
Antworten
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protein motifs
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protein complexes
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domains
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beta sheets
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alpha helices
Frage 11
Frage
where are hydrophobic interactions most likely to occur?
Antworten
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on surface of water soluble protein
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core of water soluble protein
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in contact with water molecules
Frage 12
Frage
___________ and turns connect different peptide segments, allowing polypeptide chains to fold back in on themselves
Antworten
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rods
-
loops
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linkers
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sheets
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betas
Frage 13
Frage
GTPases are different from kinases in that
Antworten
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bind to nucleoside triphosphates
-
hydrolyze nucleoside triphosphates
-
are molecular switches
-
are abundant
-
regulate cellular events
Frage 14
Frage
what kind of interaction is not involved in binding substrate to a normally functioning enzyme?
Antworten
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H bonds
-
transient covalent bond
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ionic bonds
-
permanent covalent bond
-
hydrophobic interactions
Frage 15
Frage
a small molecule that binds to an active site of an enzyme and disrupts its catalytic function is:
Antworten
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allosteric inhibitor
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competitive inhibitor
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social inhibitor
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substrate
-
an activator
Frage 16
Frage
phosphate group is generally on ________ end of polynucleotide and hydroxyl group of sugar is found on _______ end
Antworten
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5', 3'
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3', 4'
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3', 5'
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5, 3
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5', 4'
Frage 17
Frage
what gives DNA molecule its negative charge?
Antworten
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deoxyribose
-
ribose
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phosphate groups
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chlorine ions
-
adenine
Frage 18
Frage
what explains uniform width of DNA along its length?
Antworten
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pyramidine nitrogenous base always pairs with purine nitrogenous base
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didn't get the rest of the answers
Frage 19
Frage
condition in which cells have either more or less than normal diploid number of chromosomes is called:
Antworten
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polyploidy
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aneuploidy
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euploidy
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dihaploidy
-
diploidy
Frage 20
Frage
which percent of human genome codes for amino acids in our proteins?
Antworten
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15%
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23%
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roughly 1.5%
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roughly 7.5%
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70%
Frage 21
Frage
labeled, single stranded DNAs used to localize positions of specific complementary DNA sequences within chromosomes in in situ hybridization are called
Antworten
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primers
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genes
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probes
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FISH
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diploid
Frage 22
Frage
Histone folds consist of:
Antworten
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a dimer of alpha helical bundles
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3 alpha helices
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a coiled coil
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a beta sheet and alpha helix
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2 beta strands
Frage 23
Frage
histones have very large relative amounts of which amino acids?
Antworten
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histidine and proline
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glutamate and aspartate
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lysine and glutamine
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arginine and lysine
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arginine and aspartate
Frage 24
Frage
core particle of nucleosomes consists of ____________ protein complex
Antworten
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cytoplasmic
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octameric
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diametric
-
zig zag
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tetrameric
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