Description : When comparing bacterial and archaeal cell membranes, only bacterial cell membranes a. Have three layers of phospholipids. b. Have a phospholipid bilayer. c. Are fluid. d. Have ether linkages.
Last Answer : b. Have a phospholipid bilayer.
Description : Intracellular organization in bacterial and archaeal species is centered a. Compartmentation of metabolism. b. Growth and reproduction. c. Sensing and responding to environment. d. All the above (A—C) are correct.
Last Answer : d. All the above (A—C) are correct.
Description : Keeping in view the fluid mosaic model' for the structure of cell membrane, which one of the following statement is correct with respect to the movements of lipids and proteins from one lipid ... ) Both lipids and proteins can flip-flop (d) While lipids can rarely flip-flop, proteins cannot.
Last Answer : (d) While lipids can rarely flip-flop, proteins cannot.
Description : The photosynthetic pigments used by the green sulfur bacteria and some archaeal species are a. Chlorophyll b. Bacteriochlorophyll c. Cytochrome d. Sulfate
Last Answer : b. Bacteriochlorophyll
Description : Which of the following features is predicted by the Nicolson–Singer fluid mosaic model of biological membranes? (A) Membrane lipids do not diffuse laterally (B) Membrane lipid is primarily in a monolayer form (C) Membrane lipids freely flip-flop (D) Membrane proteins may diffuse laterally
Last Answer : Answer : D
Description : Which of the following is not true for eukaryotic cells? A- Nucleus is bounded by nuclear membrane B- Chromosomes contain histones C- Chloroplasts and mitochondria contains 70S ribosomes D- Gas vacuoles are present
Last Answer : Gas vacuoles are present
Description : The carbon of the pentose in ester linkage with the phosphate in a nucleotide structure is (A) C1 (B) C3 (C) C4 (D) C5
Description : Which of the following is the main structural feature of proteins? (a) Peptide linkage (b) Ester linkage (c) Ether linkage (d) α,β-Linkage
Last Answer : Peptide linkage
Description : The local anaesthetics having amide linkage differ from those having ester linkage in that the amidelinked local anaesthetics: A. Are not surface anaesthetics B. Have a shorter duration of action C. Are degraded in the plasma D. Do not show cross-sensitivity with esterlinked local anaesthetic
Last Answer : D. Do not show cross-sensitivity with esterlinked local anaesth
Description : Which of the following is not true for prokaryotic organism? A.Nucleus is not bounded by nuclear membrane B.Chromosomes does not contain histones C.80S ribosomes are distributed in cytoplasm D.Cell wall contains peptidoglycan as one of the major component
Last Answer : C.80S ribosomes are distributed in cytoplasm
Description : Which of the following is not true for prokaryotic organism? A- Nucleus is not bounded by nuclear membrane B- Chromosomes does not contain histones C- 80S ribosomes are distributed in cytoplasm D- Cell wall contains peptidoglycan as one of the major component
Last Answer : 80S ribosomes are distributed in cytoplasm
Description : Which of the following statement is correct? (i) Sweat is waxy protective secretion having sterols, hydrocarbons and fatty acids (ii) Sebum is an aque
Last Answer : Which of the following statement is correct? (i) Sweat is waxy protective secretion having sterols, hydrocarbons and ... i C. i and ii D. i and iii
Description : A _____ is a protein receptor on the surface of macrophages, dendritic cells, and endothelial cells that allow them to recognize foreign cell markers. a. Toll-like receptor (TLR) b. pathogen-associated c. Membrane attack complex (MAC) d. Natural killer cells (NK)
Last Answer : b. pathogen-associated
Description : Where is ATP produced in prokaryotic cells? a. In The Mitochondria b. In The Chloroplast c. On The Cell Membrane d. On The Ribosomes
Last Answer : b. In The Chloroplast
Description : Which of the following statement is correct about membrane cholesterol? (A) The hydroxyl group is located near the centre of the lipid layer (B) Most of the cholesterol is in the form ... forms a rigid, planar structure (D) The hydrocarbon chain of cholesterol projects into the extracellular fluid
Last Answer : C
Description : Which of the following statement is correct about membrane cholesterol? (A) The hydroxyl group is located near the centre of the lipid layer (B) Most of the cholesterol is in the form ... forms a rigid, planar Structure (D) The hydrocarbon chain of cholesterol projects into the extracellular fluid
Last Answer : (C) The steroid nucleus form forms a rigid, planar Structure
Description : The formation of _____ by_____ directly lyses and kills pathogens. a. Membrane Attack Complexes, complement b. Inflammation, lymph nodes c. antibodies, plasma cells d. Plasma cells, B cells
Last Answer : a. Membrane Attack Complexes, complement
Description : Gram positive cells have a A- second outer membrane that helps to retain the crystal violet stain B- multiple layer of peptidoglycan that helps to retain the crystal violet stain C- .thick capsule that traps the crystal violet stain D- periplasmic space that traps the crystal violet
Last Answer : multiple layer of peptidoglycan that helps to retain the crystal violet stain
Description : Volume of `N_(2)` at 1 atm, 273 K required to form a monolayer on the surface of iron catalyst is `8.15ml//gm` of the adsorbent. What will be the surf
Last Answer : Volume of `N_(2)` at 1 atm, 273 K required to form a monolayer on the surface of iron catalyst is `8.15ml//gm` ... C. `39 m^(2)//g` D. `22400 cm^(2)`
Description : Antifungal drugs, such as_ __, inhibit proper formation of a. Miconazole; A Plasma Membrane b. Griseofulvin; Dna c. Ketoconazole; A Cell Wall d. Tiucytosine; A Rnicrotubule
Last Answer : d. Tiucytosine; A Rnicrotubule
Description : What is the direct cause of cell death by diphtheria toxin? A- Formation of an ion channel in the cell membrane B- Inactivation of a translational elongation factor C- Induction of apoptosis D- None of the above
Last Answer : Inactivation of a translational elongation factor
Description : Which of the following proteins would not need localization signal? A- A nuclear protein B- A cytosolic protein C- A protein bound to the endoplasmic reticulum (ER) membrane D- A cell surface protein
Last Answer : A cytosolic protein
Description : The unifying feature of the archaea that distinguishes them from the bacteria is A- habitats which are extreme environments with regard to acidity B- absence of a nuclear membrane temperature ... of a cell wall containing a characteristic outer membrane D- cytoplasmic ribosomes that are 70S
Last Answer : absence of a nuclear membrane temperature
Description : The stomach is a chemical barrier to infection because the stomach a. Contains bile. b. Harbors helicobacterpylori, a member of the host microbiota. c. Possesses defensive cells. d. Has an acid ph.
Last Answer : d. Has an acid ph.
Description : Clonal selection includes a. Antigen-receptor binding on B cells. b. Antibody secretion recognizing same epitope as on B cell receptors. c. Differentiation of B cells into plasma cells and memory cells. d. All the above (A—C) are correct.
Description : Which of the following is correct? A- All T Cells are CD4+ B- An epitope can have multiple antigens C- .T Cell receptors are generated by random assortment of gene cassettes D- .MHC Class II molecules are generated by random assortment of gene cassettes
Last Answer : .T Cell receptors are generated by random assortment of gene cassettes
Description : Which of the following is correct for CD8 T cells? A- CD8 T cells only recognize virus-infected cells B- CD8 T cell receptor recognizes epitopes that are also commonly recognized by B cells ... selection only D- CD8 T cells can kill individual virus-infected cells in a contact dependent fashion
Last Answer : CD8 T cells can kill individual virus-infected cells in a contact dependent fashion
Description : Which of the following statements supports the cell theory? a. all living things are made of cells b. all living things have a chromosome in the nucleus c. all living things have cellular metabolism in the mitochondria d. A-C are correct
Last Answer : a. all living things are made of cells
Description : Which of the following statement(s) is/are true concerning the cell plasma membrane? a. The plasma membrane is composed of amphipathic molecules b. The hydrophobic core of the lipid bilayer of the ... contribute to the cell coat d. The membrane proteins of nerve cells are highly voltage-dependent
Last Answer : Answer: a, b, d The plasma membrane defines the boundary of the cell and serves to contain and concentrate enzymes and other macromolecule constituents. The plasma membrane is ... and bear carbohydrate moieties primarily as oligosaccharide chains that contribute to the cell coat or glycocalyx
Description : Bacillus subtilis makes a good "bacterial factory" in genetic engineering because _____. a. it normally retains the products it makes b. it is not a human pathogen c. contains endotoxins in it's cell wall d. traditionally ferments sugars
Last Answer : b. it is not a human pathogen
Description : The _____ cell contains on its surface a CD4 receptor site that enhances binding to the macrophage. a. Helper T b. molecular patterns (PAMPs) c. plasma d. B
Last Answer : a. IgG
Description : An Hfr cell a. Has A Free F Factor In The Cytoplasm. b. Has A Chromosomally Integrated F Factor. c. Contains A Prophage For Conjugation. d. Cannot Conjugate With A F- Recombinant.
Last Answer : b. Has A Chromosomally Integrated F Factor.
Description : Which of the following statements is not true regarding Mycobacterium tuberculosis and/or the disease it causes? A.The pathogen contains mycolic acid in its cell wall B.The pathogen can live inside macrophages C.Antibodies to the pathogen are protective D.None of these
Last Answer : C.Antibodies to the pathogen are protective
Description : Which of the following is true about cell wall of gram-positive bacteria? A- It consists of multiple layers B- It is thicker than that associated with gram-negative bacteria C- It contains teichoic acids D- D.All of these
Last Answer : D.All of these
Description : Which of the following is true about cell wall of gram-positive bacteria? A-It consists of multiple layers B- It is thicker than that associated with gram-negative bacteria C- It contains teichoic acids D- All of these
Last Answer : All of these
Description : A newly discovered microscopic structure is hypothesized to be a living organism. Which of the following lines of evidence would support the contention that this organism may be alive? A- .It contains DNA B- It is made of a single cell C- It utilizes energy D- All of these
Description : Rickettsial cell wall contains A Lipotechoic acid B Diaminopimelic C Mycolic acid D Teichoic acid
Last Answer : B Diaminopimelic
Description : An attenuated vaccine is one that a. Can provide life-long immunity. b. Contains live microbes or viruses. c. Is closest to the natural pathogens. d. All the above (a-c) are correct.
Last Answer : d. All the above (a-c) are correct.
Description : Which of the following statements best describes the difference between amylose and amylopectin? (a) Amylose is a branched polysaccharide while amylopectin is a chain polysaccharide. (b) Amylose is a ... of thousands of D-glucose units while amylopectin is composed of thousands of D-galactose units.
Last Answer : Amylose is a straight-chain polysaccharide while amylopectin is a branched polysaccharide
Description : Tetracyclines interfere with a. Translation. b. Transcription. c. Dna Replication. d. Membrane Function.
Last Answer : a. Translation.
Description : This antihelminthic agent makes the membrane permeable to calcium ions. a. Mebendazole b. Pentamidine c. Ivermectin. d. Praziquantel
Last Answer : d. Praziquantel
Description : Which one of the following is NOT a function of complement? a. Stimulation of inflammation b. Stimulation of antibody formation c. Formation of membrane attack complexes d. Heightened level of phagocytosis
Last Answer : b. Stimulation of antibody formation
Description : Air filtration typically uses a filter. a. HEPA b. Membrane c. Sand d. Diatomaceous Earth
Last Answer : a. HEPA
Description : The gram-positive bacteria lack __________ structure/component? A.outer membrane B.murein C.teichoic acid D.plasma membrane
Last Answer : A.outer membrane
Description : Which of the following may be most likely to be missing from a gram-positive bacterium? A.Penicillin binding protein B.Peptidoglycan C.Lipopolysaccharide D.Phospholipid bilayer membrane
Last Answer : C.Lipopolysaccharide
Description : Which of the following is bactericidal? A.Membrane filtration B.Ionizing radiation C.Freeze-drying D.Deep freezing
Last Answer : B.Ionizing radiation
Last Answer : onizing radiation
Description : Commercial scale production of amino acids is typically carried out using A- regulatory mutants to cause overproduction of biochemical intermediates B- creation of an intentional increase in membrane permeability to increase release of the amino acids C- both (a) and (b) D- none of the above
Last Answer : both (a) and (b)
Description : Dolichol phosphate is A- a complex lipid involved in docking vesicles with the plasma membrane B- the anchor on which sugars assemble before transfer to proteins C- a chaperone used in protein folding D- a product of phospholipase C activation
Last Answer : the anchor on which sugars assemble before transfer to proteins