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Khalif Patterson

Khalif P.

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Viewed Questions

How would you prepare cis-2-butene starting from propyne, an alkyl halide, and any other reagents needed? This problem can't be worked in a single step. You'll have to carry out more than one reaction.

How would you prepare cis-2-butene starting from propyne, an alkyl halide, and any other reagents needed? This problem can't be worked in a single step. You'll have to carry out more than one reaction.

Organic Chemistry

How might you replace a halogen substituent by a deuterium atom if you wanted to prepare a deuterated compound? (FIGURE CANNOT COPY)

How might you replace a halogen substituent by a deuterium atom if you wanted to prepare a deuterated compound? (FIGURE CANNOT COPY)

Organic Chemistry

In animal sexual reproduction the gametes are formed by the process of a. meiosis. b. mitosis. c. fusion. d. binary fission.

In animal sexual reproduction the gametes are formed by the process of a. meiosis. b. mitosis. c. fusion. d. binary fission.

Biology

Questions asked

INSTANT ANSWER

Show (draw) or print or bring the 1H-NMR spectra and 13C-NMR and IR spectra for methyl ester. 13- In a 1H-NMR spectra on a scale of 0 – 10 ppm, Show the exact locations in ppm of 1- the saturated hydrocarbons, 2- the unsaturated hydrocarbons, 3- the halogenated hydrocarbons and 4- the aromatic hydrocarbons. 14- Mention the number of peaks in the 1H NMR spectrum of 1,4-dimethyl-benzene (para-xylene or p-xylene). Show and draw the exact location of the aromatic ac the aliphatic hydrogens. 15- Draw the 1H NMR spectrum of Ethyl bromide or 1-Bromoethane. Show the splitting indicating which is singlet, which is doublet, etc

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ANSWERED

Grigoriy Sereda verified

Numerade educator

Explain why 2-chloropropene shows signals for three kinds of protons in its 1H NMR spectrum? Draw the structure and predict the approximate values for 1H-NMR spectra.

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INSTANT ANSWER

Explain in details (one page hand writings) or one page typed the technique TLC and how it is used in identification and characterization of organic compounds.

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INSTANT ANSWER

1) Antibiotics that inhibit the formation of the peptidoglycan layer in bacteria work through inhibiting: a) bacterial ribosome b) Ferredoxin c) NAG-NAM formation d) bactoprenol e) bacterial replication 2) The N-Acetylmuramic acid of the peptidoglycan molecule is attached to the ____ of the tetrapeptide: a) L-Lysine of the tetrapeptide b) D-Alanine c) L-Alanine d) D-Glutamine e) D-Lysine 3) In bacillus bacteria, the second stage of the most common type of growth: a) Crescentin formation b) bactoprenol transportation c) pre-septal elongation d) polar elongation e) b & c 4) In Gram Stain the bacteria that becomes colorless after washing with alcohol or acetone is the: a) Gram +ve bacteria b) Gram -ve bacteria c) ) Gram neutral bacteria d) archaebacteria e) b & c 5) Antimetabolites include: a) Sulfonamides b) Tetracyclins c) Trimethoprim d) all of the above e) a and c 6) Oil immersion is used in light microscope because: a) it increases  only b) it decreases  only c) it increases the / n sin  value d) it decreases / n sin  e) same refractive index as the glass slide 7) One of the following antibiotics doesn’t work through the same class of molecules as the rest: a) Levofloxacin b) Rifampin c) Moxifloxacin d) Daptomycin e) Ciprofloxacin 8) In the formula [d=0.5 / n sin , d stands for: a) distance between 2 points b) distance from the slide to the objective c) Focal distance of the objective lens d) Focal distance of the ocular lens e) none of the above 9) In the formula [d=0.5 / n sin ,  stands for: a) angle of reflection b) angle of refraction c) angle of incidence d) angle of inclination e) angle of perception 10) In the formula [d=0.5 / n sin ,  stands for: a) angle of incidence b) speed of the illuminative source/light c) Nature of illuminative source/light d) wavelength illuminative source/light e) temperature of illuminative source/light

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INSTANT ANSWER

3) A large cluster (more than 8) of bacillus bacteria is called: a) coccus b) streptococcus c) staphylococcus d) octa bacillus e) none of the above 14) A streptobacillus shaped bacteria have the following shape/sructure: a) long chain of capsule/rodshaped cells b) long chain of spherical-shaped cells c) a single spherical-shaped cell d) a single capsule/rod-shaped cell e) none of the above. 15) If you are a passenger on the “Magic School Bus” and you want to “explore” the cytoplasmic component of a Gram -ve bacteria, you will have to go through: a) two membranes separated by periplasm and thick peptidoglycan region b) two membranes separated by periplasm and thin peptidoglycan region c) A glycocalyx and a membrane separated by a thin peptidoglycan region d) a thin peptidoglycan region & one membrane e) a thick peptidoglycan region & one membrane 16) If you are a passenger on the “Magic School Bus” and you want to “explore” the cytoplasmic component of a Gram +ve bacteria, you will have to go through: a) two membranes separated by periplasm and thick peptidoglycan region b) two membranes separated by periplasm and thin peptidoglycan region c) A glycocalyx and a membrane separated by a thin peptidoglycan region d) a thin peptidoglycan region & one membrane e) a thick peptidoglycan region & one membrane 17) The peptidoglycan layers are anchored to the cell membrane by: a) tetrapeptide chain b) dipeptide molecule c) teichoic acid d) lipoteichoic acid e) c & d 18) The peptidoglycan region in Gram +Ve bacteria is strengthened with ___ cross bridges of: a) Lipopolysaccahride b) Archaeol c) Hopanoids d) Polypeptides e) FtsZ 19) The fluid or region present between the inner membrane and the outer membrane of some bacteria is called: a) periplasm b) ectoplasm c) circumplasm d) lophoplasm e) amphiplasm

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INSTANT ANSWER

20) Proteins found in the bacterial cell membrane that are located in the middle layer of the cell membrane are called: a) peripheral proteins b) integral proteins c) transmembrane proteins d) cytoskeletal proteins e) amphipathic proteins 21) The portion of the proteins that are present inside the cell membrane contain amino acids that are: a) polar b) hydrophilic c) hydrophobic d) planar e) amphipathic 22) The portion of the proteins that are present on either surface the cell membrane contain amino acids that are : a) polar b) hydrophilic c) hydrophobic d) planar e) amphipathic 23) The phospholipid molecules present in the archaeal cell membrane are composed of: a) phosphate head and fatty acids tail b) phosphate heads, attached to glycerol, attached to fatty acids c) phosphate head, attached to archaeol d) phosphate heads, attached to glycerol, attached to cholesterol e) attached to glycerol, attached to archaeol 24) The bond present in the membrane lipids in Archaea is called: a) ester bond b) peptide bond c) peptidoglycan linkage d) phosphodiester bond e) ether bond 25) A small circular genetic material located in the bacterial cytoplasm but separate from the bacterial chromosome is called: a) Euchromatin b) Nucleoid c) Hopanoid d) Plasmid e) Heterochromatin 26) If bacteria contain many flagella on 1 side of the bacteria than this flagellar arrangement is called: a) monotrichous b) lophitricous c) amphitricous d) peritrichous e) veritricous 27) The bacterial ribosome is composed of two subunits called the: a) 30S and 50S subunits b) 70S and 80S subnits c) Gram +ve and Gram –Ve subunits d) Eubacterial and Cyanobacterial subunits e) none of the above 28) Anti ribosomal antibiotics include all the following except: a) Lincosamines b) Tetracycline c) Trimethoprim d) Chloramphenicol e) Erythromycin 29) If bacteria contain flagella at both ends of the bacteria than this flagellar arrangement is called: a) Ditrichous b) lophitricous c) amphitricous d) peritrichous e) apitricous 30) Most animal viruses have extra envelope derived from the: a) environment b) host membrane c) capsomeres d) viral capsules e) viral membranes 31) Viruses can’t be classified as living organisms because they lack: a) proteins b) genetic material c) receptors d) enzymes e) cell membranes

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INSTANT ANSWER

32) The diversity in _____________ in viruses reflects the diversity among viruses: a) organelles b) enzymes c) genetic material d) proteins e) cell membranes 33) The fact that viruses target specific tissues within the host they infect is called: a) Tissue Tropism b) Chemotaxsis c) Chemotropism d) Biotropism e) Biotaxsis 34) Bacteria that use reduced, performed organic molecules as their carbon source are labeled as: a) Organotroph b) Chemotroph c) Autotroph d) Heterotroph e) Lithotroph 35) The HIV virus is classified as: a) RNA virus b) Retrovirus c) Virusoid d) Filovirus e) b & c 36) Most animal viruses exhibit a shape called: a) icosahedral b) spherical c) helical dtetrahedral e) Complex binary 37) The protein coat that surrounds the genetic material of the virus is called: a) capsule b) capsid c) cell wall d) capsomer e) shell 38) The enzyme present in the HIV which must be injected with the genetic material is called: a) Reverse Replicase b) Reverse RNAase c) Reverse Transcriptase d) Reverse Polymerase e) Retro DNAase 39) Viroids are: a) RNA viruses b) Viral particle outside a cell c) special viruses that infect plants d) Satellite viruses e) a & c 40) Virions are: a) RNA viruses b) Viral particle outside a cell c) special viruses that infect plants d) Satellite viruses e) a & c 41) If a bacteria is labeled organotroph, this means it derives: a) its carbon source from organic material b) its carbon source from inorganic material c) its energy from breaking bonds from organic material d) its electrons from breaking bonds from organic material e) its electrons from breaking bonds from inorganic material 42) Plant or animal extracts are good examples of ___ gel: a) complex b) supportive c) defined d) nutritive e) a & c 43) The virusoid genome is: a) dsDNA Linear b) dsDNA Circular c) ssDNA Linear d) dsRNA Circular e) ssRNA Circular

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INSTANT ANSWER

32) The diversity in _____________ in viruses reflects the diversity among viruses: a) organelles b) enzymes c) genetic material d) proteins e) cell membranes 33) The fact that viruses target specific tissues within the host they infect is called: a) Tissue Tropism b) Chemotaxsis c) Chemotropism d) Biotropism e) Biotaxsis 34) Bacteria that use reduced, performed organic molecules as their carbon source are labeled as: a) Organotroph b) Chemotroph c) Autotroph d) Heterotroph e) Lithotroph 35) The HIV virus is classified as: a) RNA virus b) Retrovirus c) Virusoid d) Filovirus e) b & c 36) Most animal viruses exhibit a shape called: a) icosahedral b) spherical c) helical dtetrahedral e) Complex binary 37) The protein coat that surrounds the genetic material of the virus is called: a) capsule b) capsid c) cell wall d) capsomer e) shell 38) The enzyme present in the HIV which must be injected with the genetic material is called: a) Reverse Replicase b) Reverse RNAase c) Reverse Transcriptase d) Reverse Polymerase e) Retro DNAase 39) Viroids are: a) RNA viruses b) Viral particle outside a cell c) special viruses that infect plants d) Satellite viruses e) a & c 40) Virions are: a) RNA viruses b) Viral particle outside a cell c) special viruses that infect plants d) Satellite viruses e) a & c 41) If a bacteria is labeled organotroph, this means it derives: a) its carbon source from organic material b) its carbon source from inorganic material c) its energy from breaking bonds from organic material d) its electrons from breaking bonds from organic material e) its electrons from breaking bonds from inorganic material 42) Plant or animal extracts are good examples of ___ gel: a) complex b) supportive c) defined d) nutritive e) a & c 43) The virusoid genome is: a) dsDNA Linear b) dsDNA Circular c) ssDNA Linear d) dsRNA Circular e) ssRNA Circular

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INSTANT ANSWER

32) The diversity in _____________ in viruses reflects the diversity among viruses: a) organelles b) enzymes c) genetic material d) proteins e) cell membranes 33) The fact that viruses target specific tissues within the host they infect is called: a) Tissue Tropism b) Chemotaxsis c) Chemotropism d) Biotropism e) Biotaxsis 34) Bacteria that use reduced, performed organic molecules as their carbon source are labeled as: a) Organotroph b) Chemotroph c) Autotroph d) Heterotroph e) Lithotroph 35) The HIV virus is classified as: a) RNA virus b) Retrovirus c) Virusoid d) Filovirus e) b & c 36) Most animal viruses exhibit a shape called: a) icosahedral b) spherical c) helical dtetrahedral e) Complex binary 37) The protein coat that surrounds the genetic material of the virus is called: a) capsule b) capsid c) cell wall d) capsomer e) shell 38) The enzyme present in the HIV which must be injected with the genetic material is called: a) Reverse Replicase b) Reverse RNAase c) Reverse Transcriptase d) Reverse Polymerase e) Retro DNAase 39) Viroids are: a) RNA viruses b) Viral particle outside a cell c) special viruses that infect plants d) Satellite viruses e) a & c 40) Virions are: a) RNA viruses b) Viral particle outside a cell c) special viruses that infect plants d) Satellite viruses e) a & c 41) If a bacteria is labeled organotroph, this means it derives: a) its carbon source from organic material b) its carbon source from inorganic material c) its energy from breaking bonds from organic material d) its electrons from breaking bonds from organic material e) its electrons from breaking bonds from inorganic material 42) Plant or animal extracts are good examples of ___ gel: a) complex b) supportive c) defined d) nutritive e) a & c 43) The virusoid genome is: a) dsDNA Linear b) dsDNA Circular c) ssDNA Linear d) dsRNA Circular e) ssRNA Circular

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INSTANT ANSWER

32) The diversity in _____________ in viruses reflects the diversity among viruses: a) organelles b) enzymes c) genetic material d) proteins e) cell membranes 33) The fact that viruses target specific tissues within the host they infect is called: a) Tissue Tropism b) Chemotaxsis c) Chemotropism d) Biotropism e) Biotaxsis 34) Bacteria that use reduced, performed organic molecules as their carbon source are labeled as: a) Organotroph b) Chemotroph c) Autotroph d) Heterotroph e) Lithotroph 35) The HIV virus is classified as: a) RNA virus b) Retrovirus c) Virusoid d) Filovirus e) b & c 36) Most animal viruses exhibit a shape called: a) icosahedral b) spherical c) helical dtetrahedral e) Complex binary 37) The protein coat that surrounds the genetic material of the virus is called: a) capsule b) capsid c) cell wall d) capsomer e) shell 38) The enzyme present in the HIV which must be injected with the genetic material is called: a) Reverse Replicase b) Reverse RNAase c) Reverse Transcriptase d) Reverse Polymerase e) Retro DNAase 39) Viroids are: a) RNA viruses b) Viral particle outside a cell c) special viruses that infect plants d) Satellite viruses e) a & c 40) Virions are: a) RNA viruses b) Viral particle outside a cell c) special viruses that infect plants d) Satellite viruses e) a & c 41) If a bacteria is labeled organotroph, this means it derives: a) its carbon source from organic material b) its carbon source from inorganic material c) its energy from breaking bonds from organic material d) its electrons from breaking bonds from organic material e) its electrons from breaking bonds from inorganic material 42) Plant or animal extracts are good examples of ___ gel: a) complex b) supportive c) defined d) nutritive e) a & c 43) The virusoid genome is: a) dsDNA Linear b) dsDNA Circular c) ssDNA Linear d) dsRNA Circular e) ssRNA Circular

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