Cell Biology test 1 Flashcards
Which of the following structures of a cell would be disrupted by the addition of colchicines?
A)Phragmoplast
B)Preprophase band
C)Mitotic bundles
D)All of the above
D)All of the above
What is the large family of dimeric proteins that facilitate the elongating of actin filaments?
A) Profilin
B) Thymosin
C) Formin
D) Stathmin
C) Formin
Which vitamin has the role of transferring CO2 from one molecule to another (decarbonization)?
A) Biotin
B) Pyridoxine
C) Cobalamin
D) Thiamine
A) Biotin
What group of proteins are regulated by higher temperatures that maintain the conformation of other proteins?
A) Chaperonin
B) Thermosome
C) Heat shack protein
D) Thermostatic barrels
C) Heat shock protein
What is the indicator that loses its color in the presence of vitamin C?
A) DCPIP
B) Indopenol
C) Methylene blue
D) Wurster’s blue
A) DCPIP
In the rubber industry, what enzyme is used to generate oxygen from peroxide?
A) Catalase
B) Peroxase
C) Ficin
D) Trypsin
A) Catalase
What are the name of the alleles that are inheirited together in clusters without major genetic rearrangement?
A) Polynucleotide polymorphisms
B) Haplotype blocks
C) Tandem genes
D) Allele map
B) Haplotype blocks
Other than through direcct signal transduction with the apoptotic proteins like caspase 8, through what organelle can apoptosis function?
A) Nucleus
B) Endoplasmic Reticulum
C) Lysosome
D) Mitochondria
D) Mitochondria
What shape is the head of the bacteriophage T4?
A) Helical
B) Icosahedral
C) Prolate
D) Complex
C) Icosahedral
During senecase in plants, what plasmid dismantles the photosynthetic apparatus?
A) Amyloplast
B) Gerontoplast
C) Chromoplast
D) Etioplast
B) Gerontoplast
What functional group is found in ATP?
A) Phosphoester
B) Phosphoanhydride
C) Phosphoenol
D) Phosphocarboxylate
B) Phosphoanhydride
What type of fermentation does not produce any gas?
A) Homolactic fermentation
B) Heterolactic fermentation
C) Ethanol fermentation
D) Propanol fermentation
A) Homolactic fermentation
What happens during fluorescence recovery after photobleaching?
A) Activating an inactive florophore witth intense light
B) Fluorescence is introduced in a small portion of a sample
C) Analysis is done on how the fluorescence spreads
D) Light extinguishes the fluorescence in a certain area
D) Light extinguishes the fuorescence in a certain area
What is the proper order of the five sequential stages of Prophase I?
A) Zygotene, leptotene, pachytene, diakinesis, diplotene
B) Diplotene, pachytene, zygotene, leptotene, diakinesis
C) Leptotene, zygotene, pachytene, diplotene, diakinesis
D) Diakinesis, pachytene, zygotene, diakinesis, leptotene
C) Leptotene, zygotene, pachytene, diplotene, diakinesis
Which of the following statements is NOT a way in which protease action is controlled?
A) There is negative feedback being exherted by protease products
B) The cell secretes its own inhibitors
C) Proteases are abundant but in an inactive form
D) Proteases must be bound to specific receptors to be active
A) There is negative feedback being exherted by protease products
Which of the following best explains why isoelectric focusing is performed first and then SDS-PAGE in a 2D electrophoesis?
A) Isoelectric focusing requires neutral pH and SDS requires acidic pH
B) SDS denatures proteins and establishes a uniform negative charge
C) Isoelectric focusing requires a very fine gel that will be disrupted if SDS-PAGE is performed first
D) SDS-PAGE causes the formation of strong disulfide bonds in order to analyze protein mass
B) SDS denatures proteins and establishes a uniform negative charge
Which of the following statements is true about histones?
A) They are highly alkalinic
B) There are six major classes of histones
C) A typical nucleosome has four turns of DNA around it
D) They are present in high amounts in euchromatin
A) They are highly alkalinic
Which two of the following metabolic pathways produces NADPH?
A) Light-dependent reactions
B) Glyoxylate cycle
C) Pentose phosphate pathway
D) Cori cycle
A) Light-dependent reactions
C) Pentose phosphate pathway
Which of the following statements best explains why diabetes leads to life-threaening acidosis?
A) Gluccose is converted into hydrophobic acids that can be taken up by cells
B) Glucose sparing leads to the production of ketone bodies
C) The cotransport of glucose into cells results in the pumping of high amounts of protons out of the cells
D) Glucose retention in the blood leads to a buildup of acidic metabolites
B) Glucose sparing leads to the producction of ketone bodies
Which two of the following molecules can phosphodiesterase act on?
A) Phospholipids
B) Deoxyribonucleic acid
C) Cyclic AMP
D) Glyceraldehyde 3 phosphate
B) Deoxyribonucleic acid
C) Cyclic AMP
