The _____ microscope would be used to view cell structures within
ultrathin sections of cells.
a. scanning electron
b. transmission electron
c. bright-field
d. dark-field

1 Answer

Answer :

b. transmission electron

Related questions

Description : If you wanted to study the surface of a bacterial cell, you would use a. A transmission electron microscope. b. A light microscope with phase-contrast optics. c. A scanning electron microscope. d. A light microscope with dark-field optics.

Last Answer : c. A scanning electron microscope.

Description : If you wanted to study bacterial motility you would most likely use a. A transmission electron microscope. b. A tight microscope with dark-field optics. c. A scanning electron microscope. d. A light microscope with phase-contrast optics.

Last Answer : a. A transmission electron microscope.

Description : What type of microscope is usually necessary for observing viruses? A Dark field microscope B Phase contrast microscope C Electron microscope D Compoundmicroscope

Last Answer : C Electron microscope

Description : A major breakthrough in the studies of cells came with the development of electron microscope. This is because (a) the electron microscope is more powerful than the light microscope as it ... (d) electron beam can pass through thick materials, whereas light microscopy requires thin sections.

Last Answer : (b) the resolving power of the electron microscope is much higher than that of the light microscope

Description : A three dimensional image is obtained by a)Electron microscope b) Scanning electron microscope c) Magnetic imaging d)None of these

Last Answer : b) Scanning electron microscope

Description : What are the structures called that give an appearance as ‘beads-on-string’ in the chromosomes when viewed under electron microscope? (a) Genes (b) Nucleotides (c) Nucleosomes (d) Base pairs

Last Answer : Nucleosomes

Description : Before bacterial cells are simple stained and observed with the light microscope, they must be a. Smeared on a slide. b. Heat fixed. c. Air dried. d. All the above (A—C) are correct.

Last Answer : d. All the above (A—C) are correct.

Description : Who was the first person to see bacterial cells with the microscope? a. Pasteur b. Koch c. Leeuwenhoek d. Hooke

Last Answer : c. Leeuwenhoek

Description : PAS staining of microscope sections of red blood cells gives a pink stain on only one side of the cell membrane. Which side is it, the extracellular or the intracellular side? 

Last Answer : Extracellular. All glycoprotein and glycolipids of the plasma membrane of red and all other cells are on theoutside of the cell. No oligosaccharides are present on the inner face of the cell membrane. 

Description : Other than electrons, what else can you magnify and view with an electron microscope?

Last Answer : My Paycheck

Description : Antibiotics will not work against _____ diseases because they lack the structures and metabolic machinery with which antibiotics interfere. a. viral b. bacterial c. fungal d. protozoan

Last Answer : a. viral

Description : When nutrients are limiting, some bacterial species can form resistant structures called _____. a. endospores b. cysts c. seeds d. capsules

Last Answer : a. endospores

Description : Which one of the following is true of the hypha? a. It is the morphological unit of the fungus. b. It is visible without a microscope. c. It lacks a cell wall. d. None of the above (A-C) is true.

Last Answer : a. It is the morphological unit of the fungus.

Description : Resolving power is the ability of a microscope to a. Estimate cell size. b. Magnify an image. c. See two close objects as separate. d. Keep objects in focus.

Last Answer : d. Keep objects in focus.

Description : A bacterial cell that is transformed _____. a. Cannot Form A Conjugation Pilus. b. Has Undergone A Frameshift Mutation. c. Has Acquired Dna From The Environment. d. Will Probably Die Within 24 Hours.

Last Answer : c. Has Acquired Dna From The Environment.

Description : Name the green dot like structures in some cells observed by a student when a leaf peel was viewed under a microscope. What is this green colour due to? -Biology

Last Answer : The green dot-like structures in some cells observed by a student when a leaf peel is viewed under a microscope are chloroplasts. The green colour is due to the presence of green pigment, chlorophyll.

Description : What is a scanning probe microscope?

Last Answer : What is the answer ?

Description : Eukaryotic cell organelles first emerged A.from a specialized lineage of cells within the kingdom Protista B.when prokaryotes engulfed each other and became interdependent C.when bacteria made their first attempts at reproduction D.just before the origin of the animal and fungal kingdoms

Last Answer : B.when prokaryotes engulfed each other and became interdependent

Description : Acquired immunity consists of humoral immunity maintained by _____ and _____, and cell-mediated immunity controlled by _____ a. T cells, complement, B cells b. T cells, Interleukin, B cells c. B cells, antibodies, T cells d. B cells, histamine, T cells

Last Answer : c. B cells, antibodies, T cells

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 : Pick out the wrong statement. (A) The X-rays cannot be deflected by electric field unlike cathode rays (B) The intensity of X-rays can be measured by ionisation current produced due to the ... the anode-cathode voltage (D) Crystal structure of a material can be studied by an electron microscope

Last Answer : (C) The quality of X-rays can be controlled by varying the anode-cathode voltage

Description : _____the scientific (and medical) study of the causes, transmission, and prevention of disease within a population. a. Epidemiology b. Pathology c. Microbiology d. Virulence

Last Answer : a. Epidemiology

Description : Which type of microscope is used to study extremely small things, such as cell structures by passing a beam of electrons through an object?

Last Answer : optical microscope

Description : Which is correct about cell theory in view of current status of our knowledge about cell structure? (a) It needs modification due to discovery of subcellular structures like chloroplasts and ... Cell theory means that all living objects consists of cells whether or not capable of reproducing

Last Answer : (c) Cell theory does not hold good because all living beings (e.g., viruses) do not have cellular organisation.

Description : Why are slime molds considered to resemble plants? A.They can photosynthesize B.Theyhave cell walls composed largely of cellulose C.They form a threadlike structure D.They form structures that resemble leaves

Last Answer : B.Theyhave cell walls composed largely of cellulose

Description : Why are slime molds considered to resemble plants? A.They can photosynthesize B.Theyhave cell walls composed largely of cellulose C.They form a threadlike structure D.They form structures that resemble leaves

Last Answer : Theyhave cell walls composed largely of cellulose

Description : Why are slime molds considered to resemble plants? A- They can photosynthesize B- They have cell walls composed largely of cellulose C- They form a threadlike structure D- They form structures that resemble leaves

Last Answer : They have cell walls composed largely of cellulose

Description : : _____ methods of disease transmission include fomites and _____. a. Indirect; kissing b. Indirect; arthropods c. Direct; kissing d. Direct; arthropods

Last Answer : b. Indirect; arthropods

Description : The fecal-oral route is the mode of transmission for the _____. a. Hepatitis A virus. b. Hepatitis B virus. c. Hepatitis A and B viruses. d. All hepatitis viruses.

Last Answer : b. Hepatitis B virus.

Description : The basic structure of cell membranes (a) Is a lipid bilayer that serves as a barrier to water soluble molecules (b) Differs ultra structurally for internal and external membranes ... dispersed within a protein bilayer (d) Is visualised as bilaminar structure with transmission electron microscopy

Last Answer : Ans:(a)

Description : A transgenic organism is one that _____. a. Has Donated A DNA Fragment To Another Organism. b. Contains A Gene From Another Organism. c. Contains Useless "Genetic Debris." d. Has Exchanged Gene Loci Within The Organism.

Last Answer : b. Contains A Gene From Another Organism.

Description : In a eukaryotic microbe, those sections of a primary RNA transcript that will NOT be translated are called a. Introns. b. Anticodons. c. ―Jumping Genes.‖ d. Exons.

Last Answer : a. Introns.

Description : Under the electron microscope, you observe a cell with three different types of large organelles, each bounded by two membranes. The cell is most likely (a) A plant (b) An animal (c) A fungus (d) A bacterium

Last Answer : Ans:(a)

Description : Hyperimmune serum is serum with a higher than normal level of _____. a. antigens b. antibodies c. toxins d. immune cells

Last Answer : b. antibodies

Description : All forms of immunity depend on an exposure to antigens and a subsequent response by _____ cells. a. basophil b. neutrophil c. NK d. T

Last Answer : d. T

Description : Booster immunizations are used to raise the antibody level by stimulating the _____ cells to induce the secondary antibody response. a. helper T b. B c. memory d. plasma

Last Answer : c. memory

Description : Antibodies produced by a single clone of myeloma cells are referred to as _____ antibodies. a. Chimeric b. Monoclonal c. Polyclonal d. Hybrid

Last Answer : b. Monoclonal

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 : The cytotoxic T cells have a_____ co-receptor while the helper T cells have a _____ co-receptor. a. CD8. CD4 b. CD4, CD8 c. MHCI, MHCII d. MHCII, MHCI

Last Answer : a. CD8. CD4

Description : _____ cells have antibodies on their surface that perform receptor functions by binding to antigen (epitope). a. T b. B c. NK d. A-C are correct

Last Answer : b. B

Description : _____ T cells prevent autoreactive T cells from attacking self. a. Memory b. Helper c. Regulatory d. Effector

Last Answer : c. Regulatory

Description : Acquired immunity usually involves protein receptors on B and T cells that recognize discrete regions of the antigen called _____. a. haptens b. epitopes c. antibodies d. protein receptors

Last Answer : b. epitopes

Description : In the body's immune system, _____ are the major producers of secreted antibodies. a. macrophages b. plasma cells c. T cells d. B cells

Last Answer : b. plasma cells

Description : Antigens that bind directly to MHC proteins without any processing are known as _____. a. epitopes b. haptens c. superantigens d. naïve cells

Last Answer : c. superantigens

Description : Virus infected cells produce a set of cytokine proteins called _____ that "alert" surrounding cells to the viral threat. a. Interleukin-1 (IL-1) b. Interferon. c. Toll Like Receptors (TLR) d. Acute Phase Proteins

Last Answer : b. Interferon.

Description : Mononucleosis is an infection of________ cells by the _____. a. T; cytomegalovirus b. B; Epstein-Barr virus c. Lung; cytomegalovirus d. red blood; Epstein.Barr virus

Last Answer : d. red blood; Epstein.Barr virus

Description : Retroviruses are so-named because their reverse transcriptase _____. a. reverses the flow of genetic information by stimulating information to proceed from RNA to DNA. b. reverses the normal ... the action of drugs on viruses and allows them to continue multiplying in living cells.

Last Answer : a. reverses the flow of genetic information by stimulating information to proceed from RNA to DNA.

Description : Attenuated viruses are those that _____. a. can be used to treat viral disease. b. give rise to viroids and prions. c. multiply in cells but at a low rate. d. have been treated with chemicals such as formaldehyde.

Last Answer : c. multiply in cells but at a low rate.

Description : Of the hemolytic groups of streptococci, _____ is the most dangerous because the organisms completely destroy red blood cells. a. alpha hemolytic group b. the beta hemolytic group c. the gamma hemolytic d. strep viridins group

Last Answer : b. the beta hemolytic group

Description : Ehrlichiosis is transmitted by _____ and infects _____. a. Lice; Red Blood Cells b. Ticks; Leukocytes c. Fleas; Skin Cells d. Ticks; Liver Cells

Last Answer : b. Ticks; Leukocytes