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You Are On Multi Choice Question Bank SET 156
7801. Transcription of each set of rRNA genes by RNA polymerasel produces
(A): a single 18S rRNA precursor molecule (B): a single 28S rRNA precursor molecule (C): a single 45S rRNA precursor molecule (D): a single 5S rRNA precursor molecule
7802. The regions of a gene located at -10 and -35, with respect to the start of transcription, are termed
(A): oriC regions. (B): promoters. (C): Shine Dalgarno sequences. (D): start codons.
7803. Which of the following conditions would cause the release of the lac repressor protein from the lac operator site on DNA?
(A): Both (b) and (c) (B): Presence of glucose in the growth media (C): Presence of IPTG (isopropyl thiogalactoside) in the growth media (D): Presence of lactose in the growth media
7804. The complex of RNA polymerase, DNA template and new RNA transcript is called
(A): a translation bubble (B): none of these (C): replication bubble (D): transcription bubble
7805. RNA polymerase in prokaryotes has a removable
(A): alpha subunit (B): beta subunit (C): both (a) and (b) (D): sigma subunit
7806. Promoters for tRNAs are located
(A): both (a) and (b) (B): downstream from the start codon (C): none of these (D): upstream from the start codon
7807. The binding of lac repressor to DNA could be considered to be analogous to
(A): allosteric effects in enzyme regulation (B): competitive inhibition of an enzyme (C): mixed-type inhibition of an enzyme (D): uncompetitive inhibition of an enzyme
7808. Rho-dependent termination of transcription in E. coli
(A): both (a) and (b) (B): removes mRNA and holoenzyme from the DNA (C): requires about 50 nucleotides of uncomplexed mRNA (D): requires ATP
7809. ബാരോമീറ്റർ എന്തളക്കാനാണുപയോഗിക്കുന്നത് ? [Baaromeettar enthalakkaanaanupayogikkunnathu ?]
(A): അന്തരീക്ഷമർ ദ്ദം [Anthareekshamar ddham] (B): ഊഷ്മാവ് [Ooshmaavu ] (C): കാറ്റിന്റെ വേഗത [Kaattinte vegatha] (D): സാന്ദ്രത [Saandratha]
7810. ലോകത്തില് വച്ച് ഏറ്റവും ഭാരം കൂടിയ ഷഡ്പദം ? [Lokatthilu vacchu ettavum bhaaram koodiya shadpadam ?]
(A): ആഫ്രിക്കന് ഗോലിയാത് ബീറ്റില് [Aaphrikkanu goliyaathu beettilu ] (B): ഇവയൊന്നുമല്ല [Ivayonnumalla] (C): ക്യൂന് ടെര് മൈറ്റുകള് [Kyoonu deru myttukalu ] (D): മാന്റിസ് റിലീജയോസ [Maantisu rileejayosa]
7811. The clerk............ helped us didn’t expect anything in return
(A): that (B): which (C): who (D): whom
7812. 2004- ലെ കോപ്പ അമേരിക്ക കപ്പ് നേടിയതാരാണ് ? [2004- le koppa amerikka kappu nediyathaaraanu ?]
(A): അര് ജന്റീന [Aru janteena] (B): കോസ്റ്റാറിക്ക [Kosttaarikka] (C): പെറു [Peru] (D): ബസീൽ [Baseel]
7813. പാമ്പുകള് ഇല്ലാത്ത രാജ്യമേത് ? [Paampukalu illaattha raajyamethu ?]
(A): ആസ് ത്രേലിയ [Aasu threliya] (B): ജപ്പാന് [Jappaanu ] (C): ന്യൂസിലാന്റ് [Nyoosilaantu ] (D): ഫിലിപ്പൈന് സ് [Philippynu su ]
7814. Internal conversion is where
(A): A molecule converts excess electronic energy to vibrational energy (B): A molecule converts its excess energy to light, and emits a photon (C): none of the above (D): the spin of an excited electron reverses, changing the state of the molecule (from singlet state to triplet state or vice versa)
7815. Why phosphorescence measurements are usually made at a low temperature?
(A): To decease the efficiency of detector (B): To increase the efficiency of the detector (C): To prevent thermal degradation of the phosphorescent species (D): To promote phosphorescence by slowing the rate of radiationless transfer processes
7816. Fluorescence occurs when
(A): a molecule lowers its vibrational energy by losing it's excess energy as a photon (B): a molecule returns to the electronic ground state from an excited triplet state by losing it's excess energy as a photon (C): a molecule returns to the electronic ground state from an excited singlet state by losing it's excess energy as a photon (D): none of the above
7817. What is the relationship between wavelength and wave number?
(A): None of the above (B): Wavelength in nanometers x wavenumber = 1 (C): Wavenumber - wavelength in nanometers = 1 (D): Wavenumber = 1 / wavelength in centimeters
7818. In the intersystem crossing
(A): a molecule converts excess electronic energy to vibrational energy (B): a molecule converts its excess energy to light, and emits a photon (C): all of the above (D): the spin of an excited electron reverses, changing the state of the molecule (from singlet state to triplet state or vice versa)
7819. Why must the radiation source for fluorescence spectrometry be more powerful than for absorption spectroscopy?
(A): Because the magnitude of the output signal is proportional to the power of the incident radiation (B): None of the above (C): To allow for scattering by the sample
7820. Why do fluorescence spectrometers often use double-beam optics?
(A): All of the above (B): So a reference solution can be used (C): To compensate for beam attenuation by the monochromator (D): To compensate for power fluctuations in the radiation source
7821. For a molecule to absorb IR, why must the molecule's vibrations cause fluctuations in the dipole moment of the molecule?
(A): All of the above (B): Because a change in dipole moment lowers the energy required for electronic transitions (C): Because fluctuations in the dipole moment allow the molecule to deform by bending and stretching (D): Because for absorption to occur, the radiation must interact with the electric field caused by changing dipole moment
7822. 1911 എന്ന വർഷവുമായി ബന്ധമില്ലാത്ത പ്രസ്താവന [1911 enna varshavumaayi bandhamillaattha prasthaavana]
(A): ഇന്ത്യയുടെ തലസ്ഥാനം കൽത്തയിൽ നിന്നും ഡൽഹിയിലേക്ക് മാറ്റി [Inthyayude thalasthaanam kaltthayil ninnum dalhiyilekku maatti] (B): ജോർജ്ജ് ആറാമാൻ രാജാവ് ഇന്ത്യ സന്ദർശിച്ചു [Jorjju aaraamaan raajaavu inthya sandarshicchu] (C): ബംഗാൽ വിഭജനം റദ്ദു ചെയ്തു [Bamgaal vibhajanam raddhu cheythu] (D): മൊണ്ടെഗു - ചെംസ് ഫോര് ഡ് ഭരണ പരിഷ്കാരം [Mondegu - chemsu phoru du bharana parishkaaram]
7823. " ശാകാരി " എന്ന സ്ഥാനപ്പേര് സ്വീകരിച്ച ഗുപ്തരാജാവ് [" shaakaari " enna sthaanapperu sveekariccha guptharaajaavu ]
(A): ചന്ദ്രഗുപ്തൻ I [Chandragupthan i] (B): ചന്ദ്രഗുപ്തൻ II [Chandragupthan ii] (C): പുരുഗുപ്തൻ [Purugupthan] (D): സമുദ്രഗുപ്തൻ [Samudragupthan]
7824. കേസരി ജേർണലിന്റെ സ്ഥാപകൻ [Kesari jernalinte sthaapakan ]
(A): ഗോപാലകൃഷ്ണ ഗോഖലെ [Gopaalakrushna gokhale] (B): ദാദാഭായ് നവറോജി [Daadaabhaayu navaroji] (C): ബാലഗംഗാധര തിലക [Baalagamgaadhara thilaka] (D): സുരേന്ദ്രനാഥ ബാനർജി [Surendranaatha baanarji]
7825. സ്റ്റേപ്പിസ് സ്ഥിതി ചെയ്യുന്നത് ? [Stteppisu sthithi cheyyunnathu ?]
(A): ആന്തരകർണ്ണം [Aantharakarnnam ] (B): ഇതൊന്നുമല്ല [Ithonnumalla] (C): ബാഹ്യകർണ്ണം
[Baahyakarnnam
] (D): മധ്യകർണ്ണം [Madhyakarnnam ]
7826. " രഘുവംശം " എന്ന സംസ് കൃത മഹാകാവ്യം എഴുതിയതാര് ? [" raghuvamsham " enna samsu krutha mahaakaavyam ezhuthiyathaaru ?]
(A): കാളിദാസൻ [Kaalidaasan] (B): ഭവഭൂതി [Bhavabhoothi] (C): ഭാസന് [Bhaasanu ] (D): വാത്മീകി [Vaathmeeki]
7827. Vitamin B12 (Cobalamin) is only synthesized by
(A): animals (B): fishes (C): micro-organisms (D): plants
7828. Which of the following are reduced coenzymes?
(A): ATP and GTP (B): Coenzyme A and ubiquinone (C): NAD+ and FAD (D): NADH and FADH2
7829. The absence of ascorbic acid in the human diet gives rise to
(A): beri-beri (B): cataract (C): pernicious anemia (D): rickets
7830. Vitamins are essential because the organism
(A): can synthesize these compounds partially (B): can't synthesize these compounds at all (C): can't synthesize these compounds in the adequate amounts (D): none of the above
7831. The prosthetic group biotin is a carrier of which type of molecule?
(A): Activated carbon dioxide (CO2) (B): Ammonia (C): Methyl group (D): Sulfhydryl group
7832. Lipoic acid exists in
(A): none of these (B): oxidized and reduced form both (C): oxidized form (D): reduced form
7833. Vitamin B12 is useful in the prevention and treatment of
(A): beri-beri (B): cataract (C): pernicious anemia (D): scurvy
7834. An example of a digestive hormone is
(A): amylase (B): gastrin (C): lipase (D): pepsin
7835. In the co-enzyme B12the position occupied by a cyanide ion in vitamin B12 is bonded directly to the __________ of the ribose of adenosine.
(A): 5-6 dimethylbenzimidazole (B): adenine (C): cyanocobalamin (D): hydroxycobalamin
7836. The reductant, NADH, transfers the electrons via a flavo-proteins to the specific disulfide (S-S) protein to form a dithiol (SH,SH) protein which converts vitamin
(A): B12(Co) to B12(Co2+) (B): B12(Co+)to B12(Co2+) (C): B12(Co2+)to B12(Co) (D): B12(Co2+)to B12(Co+)
7837. An early sign of retinol deficiencies in man is
(A): keratinization (B): night blindness (C): none of these (D): xeropthalmia
7838. An enzyme, L-folate reductase reduces folic acid to
(A): dihydrofolic acid (B): hydrofolic acid (C): tetrahydrofolic acid (D): trihydrofolic acid
7839. What compound of raw egg white causes a syndrome similar to vitamin B deficiency?
(A): Albumin (B): Avidin (C): Betabindin (D): Ovalbumin
7840. The disease Beriberi is due to a dietary deficiency in
(A): vitamin B1 (thiamine) (B): vitamin B12 (C): vitamin B2 (riboflavin) (D): vitamin B6 (pyridoxine)
7841. Which of these is a symptom of vitamin A deficiency?
(A): Blindness (B): Impaired blood clotting (C): Impaired taste perception (D): Osteoporosis
7842. Vitamin-C is considered as a
(A): fat and water soluble (B): fat soluble (C): none of these (D): water soluble
7843. The vitamin niacin is part of the __________ molecule.
(A): ferredoxin (B): NAD+ (C): pyridoxal phosphate (D): pyrophosphate
7844. Which of these hormones is a catecholamine?
(A): Follitropin (B): Norepinephrine (C): Tetrahydrofolate (D): Tetraiodothyronine
7845. Dihydroorotate dehydrogenase contains
(A): 2 flavins and 2 atoms of iron per molecule (B): 2 flavins and 4 atoms of iron per molecule (C): 4 flavins and 2 atoms of iron per molecule (D): 4 flavins and 4 atoms of iron per molecule
7846. E.coli ACP has its molecular weight as around
(A): 19000 (B): 39000 (C): 90,000 (D): 9000
7847. The vitamin riboflavin is part of the __________ molecule.
(A): FAD (B): ferredoxin (C): pyridoxal phosphat (D): pyrophosphate
7848. The most prominent role that tocopherol has in in-vitro systems is as a strong
(A): all of these (B): antioxidants (C): oxidizing agent (D): reducing agent
7849. Biotin occurs mainly in combined forms bound to protein through
(A): ε-N-biotinyl-L-lysine (B): ε-N-lipoyl - L-lysine (C): ε-N-lysine moiety (D): ε-S-lysine moiety
7850. Lipoic acid is a co-factor of the
(A): α-ketoglutaric dehydrogenase (B): both (a) and (b) (C): di-hydroorotate dehydrogenase (D): pyruvic dehydrogenase
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