10942213
Descripción
Test por Amy Goulden, actualizado hace más de 1 año
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Creado por Amy Goulden
hace alrededor de 7 años
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Pregunta 1
Pregunta
Enzymes...
Respuesta
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lower activation energy and catalyze reactions
-
are affected by temperature and pH
-
can be regulated and inhibited
-
are necessary for most body reactions
-
all of the above
Pregunta 2
Pregunta
Homologous chromosomes move toward opposite poles of a dividing cell during:
Respuesta
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Mitosis
-
Meiosis 1
-
Meiosis 2
-
Cytokinesis
-
More than one is correct
Pregunta 3
Pregunta
A white blood cell that destroys bacteria and removes debris would contain many:
Respuesta
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mitochondria
-
lysosomes
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peroxisomes
-
golgi bodies
-
none of the above
Pregunta 4
Pregunta
Which component is the LEAST involved in translation and protein production?
Respuesta
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mRNA
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DNA
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tRNA
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Ribosomes
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Aminoacyl-tRNA-synthesase
Pregunta 5
Pregunta
What is NOT needed to initiate transcription?
Respuesta
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TATA Box
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Transcription factors
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RNA Polymerase
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5' Cap and Poly-A-Tail
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None of the above are needed
Pregunta 6
Pregunta
During aerobic respiration, energy (and electrons) are transferred downhill in which sequence?
Respuesta
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glucose →pyruvate→ATP→oxygen
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food→NADH→electron transport chain→ATP
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food→glycolysis→ATP→NADH
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glucose→ATP→electron transport chain→NADH
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food→glycolysis→kreb’s cycle→electron transport chain→ATP
Pregunta 7
Pregunta
Choose the incorrect statement about DNA replication:
Respuesta
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Ligase connects the okazaki fragments after they are formed
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Okazaki fragments are formed on the leading strand
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Primase lays down an RNA primer to initiate an okazaki fragment
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Polymerase I replaces the RNA primer with DNA
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none – all of the above are correct
Pregunta 8
Pregunta
During mitosis, which is not a part of prophase?
Respuesta
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condensing of the chromatin
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disintegration of the nuclear membrane
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crossing over
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movement of the centrioles
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none –all of the above are correct
Pregunta 9
Pregunta
Which of the following is true concerning cancer cells?
Respuesta
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They do not exhibit density-dependent inhibition when growing in culture.
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When they stop dividing, they do so at random points in the cell cycle.
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They are not subject to cell cycle controls.
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All of the above
-
Only two of the above
Pregunta 10
Pregunta
Which of the following statements about genes is incorrect?
Respuesta
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Genes correspond to segments of DNA
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Many genes contain the information needed for cells to synthesize enzymes and other proteins
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Under normal circumstances, each chromosome contains one gene
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Genetic differences can result from changes in the DNA called mutations
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None - all of the above are correct
Pregunta 11
Pregunta
Meiosis:
Respuesta
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creates gametes for sexual reproduction
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results in 2 daughter cells with half the DNA
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doubles its DNA twice
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two are correct
-
none of the above are correct
Pregunta 12
Pregunta
The strands that make up DNA are antiparallel. This means that
Respuesta
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the twisting nature of DNA creates nonparallel strands
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the 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand
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base pairings create unequal spacing between the two DNA strands
-
one strand is positively charged and the other is negatively charged
-
more than one is correct
Pregunta 13
Pregunta
Choose an incorrect statement about cytokinesis
Respuesta
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it involves actin and myosin
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it occurs in telophase
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it is the splitting of the cytoplasm
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none - all of the above are correct
-
two of the above are correct
Pregunta 14
Pregunta
NADH
Respuesta
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is produced in glycolysis
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is produced in Kreb's cycle
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shuttles ions to the ETC
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all of the above
-
only two of the above
Pregunta 15
Pregunta
Nucleic acids are the building blocks for
Respuesta
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proteins
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fats
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DNA
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starch
-
more than one is correct
Pregunta 16
Pregunta
A red blood cell was placed in a salt solution and got swollen. The solution was:
Respuesta
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hypertonic to the cell
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isotonic to the cell
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hypotonic to the cell
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none of the above - osmosis is not invovlved
Pregunta 17
Pregunta
How does facilitated diffusion differ from active transport?
Respuesta
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Only active transport rewuires energy
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only active transprot binds the molecule in a protein receptor site
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only active transport goes against the concentration gradient
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all of the above
-
only two of the above are correct
Pregunta 18
Pregunta
The glycocalyx of the cell membrane may
Respuesta
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play a role in cell communication
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help with cell orientation
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be a boundary for cell growth
-
all of the above
-
only two of the above are correct
Pregunta 19
Pregunta
Chemiosmosis involves the enzyme
Respuesta
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hexokinase
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phosphofructokinase
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Na/K ATPase
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ATP synthases
-
none of the above
Pregunta 20
Pregunta
Allosteric control of cellular respiration involves the enzyme
Respuesta
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hexokinase
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pyruvate kinase
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phosphofructokinase
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aldolase
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all of the above
Pregunta 21
Pregunta
The final acceptor of electrons in oxidative phosphorylation is
Respuesta
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oxygen
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water
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NADH
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ATP
-
None of the above
Pregunta 22
Pregunta
The first step in metabolism of fatty acids involves
Respuesta
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glycolysis
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beta oxidation
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Kreb's cycle
-
oxidative phosphorylation
-
none of the above
Pregunta 23
Pregunta
Which of the following is NOT a function of the membrane proteins?
Respuesta
-
serve as channels
-
membrane enxymes
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serve as carriers
-
serve as receptor sites
-
none - all of the above are correct
Pregunta 24
Pregunta
An example of genetic co-dominance would be
Respuesta
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skin colour
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eye colour
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blood types
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freckles
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none of the above
Pregunta 25
Pregunta
Select the correct statement about diffusion:
Respuesta
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it depends on random movement
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it involves active forces
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its rate increases as temperature decreases
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The chemical gradient of a substance does not affect it
-
none of these statements are correct
Pregunta 26
Pregunta
A cell placed in a hypertonic solution will
Respuesta
-
hemolyze
-
crenate
-
lose water to solution
-
a and c
-
b and c
Pregunta 27
Pregunta
Which of the following mechanisms is not used to transport Na+ within the body cells?
Respuesta
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channel transport
-
co-transport facilitated diffusion
-
active transport
-
facilitated diffusion - counter-transport
-
none - all of the above are used
Pregunta 28
Pregunta
What mechanisms are used to transport glucose in the cell?
Respuesta
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channel mediated transport
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diffusion
-
active transport
-
carrier-mediated diffusion
-
none of the above
Pregunta 29
Pregunta
Which of the following is not associated with the cell cytosol?
Respuesta
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synthesis of proteins for export from the cell
-
enzymatic regulation of glycolytic metabolism
-
presence of cytoskeletal elements
-
glycolysis
-
none - all are associated with the cytosol
Pregunta 30
Pregunta
Phospholipids
Respuesta
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each consist of a polar, hydrophilic phosphate head and two non-polar, hydrophobic fatty acid tails
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are aligned in a lipid bilayer in the plasma membrane
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serve as carrier molecules for lipid-soluble substances
-
all of the above are correct
-
only two of the above are correct
Pregunta 31
Pregunta
During prophase 1, a homologous pair of chromosomes consists of
Respuesta
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four chromosomes and two chromatids.
-
two chromosomes and two chromatids.
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two chromosomes and four chromatids.
-
one chromosome and two chromatids.
-
one chromosome and four chromatids.
Pregunta 32
Pregunta
Okazaki fragments
Respuesta
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are a type of Japanese sushi
-
are a new set of yoga movements
-
are an asian painting technique
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are a replication segment on the lagging strand
-
none of the above
Pregunta 33
Pregunta
In cell communication, which of the following would NOT be a second messenger?
Respuesta
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calcium
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calmodulin
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cAMP
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a protein hormore
-
none - all are considered second messengers
Pregunta 34
Pregunta
Plasma membranes are _____, which means that some chemicals move easily through plasma membrane while other chemicals do not.
Respuesta
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selectively permeable
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concentration graded
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electrically graded
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selectively soluble
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electrical insulators
Pregunta 35
Pregunta
This is the transport process by which gases, like O2 and CO2, move through a membrane
Respuesta
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osmosis
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active transport
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secondary active transport
-
simple diffusion
-
endocytosis
Pregunta 36
Pregunta
A group of cells is assayed for DNA content immediately following mitosis and is found to have an average of 8 picograms of DNA per nucleus. Those cells would have ________ picograms at the end of the S phase and ________ picograms at the end of G2
Respuesta
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8;8
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8;16
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16;8
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16;16
-
16;32
Pregunta 37
Pregunta
If the non-diffusible solute concentration is greater inside of the cell than outside the cell, water will move by osmosis
Respuesta
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into the cell
-
out of the cell
-
into and out of the cell at the same rate resulting in no net water movement
-
more information is needed
Pregunta 38
Pregunta
Microfilaments, intermediate filaments and microtubules are all components of a cell's
Respuesta
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cytoskeleton
-
nucleus
-
plasma membrane
-
flagella
-
ribosome
Pregunta 39
Pregunta
Which of the following membrane-enclosed organelles modifies, sorts, and packages proteins destined for other regions of the cell or for export?
Respuesta
-
endoplasmic reticulum
-
golgi complex
-
peroxisomes
-
nucleus
-
proteasome
Pregunta 40
Pregunta
This portion of a DNA segment does not code for a protein
Respuesta
-
RNA
-
introns
-
exons
-
polyribosome
-
ribosome
Pregunta 41
Pregunta
During this phase of cell division, organelles duplicate and centrosome replication begins
Respuesta
-
interphase
-
prophase
-
metaphase
-
anaphase
-
telophase
Pregunta 42
Pregunta
null
Respuesta
-
choose this
-
do not choose this
Pregunta 43
Pregunta
The following is a particular sequence of base triplet on a DNA molecule: ATG. What is the corresponding codon for the mRNA?
Respuesta
-
TAC
-
GUA
-
GTA
-
CTA
-
UAC
Pregunta 44
Pregunta
The following is a particular sequence of codon on mRNA: ACU. What is the corresponding anti-codon for the tRNA?
Respuesta
-
UGA
-
UCA
-
TGA
-
TCA
-
AUC
Pregunta 45
Pregunta
Somatic cells contain only 1 nucleus. An exception to this would be
Respuesta
-
red blood cells
-
mucscle cells
-
neurons
-
connective tissue
-
two of the above are exceptions
Pregunta 46
Pregunta
In this type of transport process, a solute (e.g. glucose) binds to a specific carrier protein on one side of the membrane. This binding induces a conformational change in the carrier protein that results in the solute moving down its concentration gradient to the other side of the membrane
Respuesta
-
osmosis
-
active transport
-
secondary active transport
-
facilitated diffusion
-
endocytosis
Pregunta 47
Pregunta
A mutation in which part of a gene is likely to be most damaging to a cell?
Respuesta
-
intron
-
exon
-
telomere
-
Poly A tail
-
all would be equally damaging
Pregunta 48
Pregunta
Nucleotides are to ________________ as _____________________ are to proteins.
Respuesta
-
amino acids; polypeptides
-
DNA; amino acids
-
genes; enzymes
-
ribosomes; enzymes
-
none of the above
Pregunta 49
Pregunta
In the absence of oxygen,
Respuesta
-
beta oxidation occurs
-
pyruvate converts to lactic acid
-
glycolysis stops
-
all of the above
-
two of the above
Pregunta 50
Pregunta
Choose the incorrect statement about DNA and DNA replication
Respuesta
-
cytosine always binds with guanine
-
the DNA strands are anti-parallel
-
in replication, the nucleotides are added to the daughter strand at the 5' end
-
the leading strand builds its daughter strand toward the replication fork
-
none - all of the above are correct
Pregunta 51
Pregunta
Epithelial tissue
Respuesta
-
is used as a covering of body surfaces
-
is used as a lining of body cavities and hollow organs
-
is used to form glands
-
usually has a free surface that interacts with the external environment
-
all of these answer choices are correct
Pregunta 52
Pregunta
Which type of epithelial tissue forms the most superficial layer of the skin?
Respuesta
-
Simple squamous epithelium
-
Simple cuboidal epithelium
-
Stratified squamous epithelium
-
Stratified cuboidal epithelium
-
Simple columnar epithelium
Pregunta 53
Pregunta
In which of the following locations would you most likely find transitional epithelial cells?
Respuesta
-
Lining of the esophagus
-
Outer layer of the skin
-
Lining of the urinary bladder
-
On the surface of the heart
-
Covering skull bones
Pregunta 54
Pregunta
The main function of dense regular connective tissues is
Respuesta
-
storing minerals for later use
-
forming stroma of soft organs
-
reducing heat loss from the body surface
-
providing strong attachment with tendons and ligaments
-
providing elasticity to stretchable organs
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