22251. The function of the sigma factor of RNA polymerase is to
22252. In both eukaryotes and prokaryotes, a promoter region that is rich in AT bases is called as
22253. The RNA polymerases that transcribe bacterial DNA are
22254. Immediately after transcription
22255. The major function of RNA polymerase's sigma factor is
22256. RNA is synthesized on a DNA template in a process called __________ , which utilizes the enzyme __________
22257. The closed complex at bacterial promoters is
22258. Transcription begins
22259. Transcription results in
22260. RNA polymerase holoenzyme initiates transcription which involves
22261. The transcriptional regulatory proteins in eukaryotes which induce transcription usually have
22262. In prokaryotes, transcription is
22263. In eukaryotes, there are three different RNA polymerases. The RNA polymerase responsible for transcription of mRNA is
22264. The nucleons of eukaryotic cell has
22265. Upstream regions which are essential for correct transcription are called
22266. Transcription of each set of rRNA genes by RNA polymerasel produces
22267. The regions of a gene located at -10 and -35, with respect to the start of transcription, are termed
22268. Which of the following conditions would cause the release of the lac repressor protein from the lac operator site on DNA?
22269. The complex of RNA polymerase, DNA template and new RNA transcript is called
22270. RNA polymerase in prokaryotes has a removable
22271. Promoters for tRNAs are located
22272. The binding of lac repressor to DNA could be considered to be analogous to
22273. Rho-dependent termination of transcription in E. coli
22274. The clerk............ helped us didn’t expect anything in return
22275. Internal conversion is where
22276. Why phosphorescence measurements are usually made at a low temperature?
22277. Fluorescence occurs when
22278. What is the relationship between wavelength and wave number?
22279. In the intersystem crossing
22280. Why must the radiation source for fluorescence spectrometry be more powerful than for absorption spectroscopy?
22281. Why do fluorescence spectrometers often use double-beam optics?
22282. For a molecule to absorb IR, why must the molecule's vibrations cause fluctuations in the dipole moment of the molecule?
22283. Vitamin B12 (Cobalamin) is only synthesized by
22284. Which of the following are reduced coenzymes?
22285. The absence of ascorbic acid in the human diet gives rise to
22286. Vitamins are essential because the organism
22287. The prosthetic group biotin is a carrier of which type of molecule?
22288. Lipoic acid exists in
22289. Vitamin B12 is useful in the prevention and treatment of
22290. An example of a digestive hormone is
22291. In the co-enzyme B12the position occupied by a cyanide ion in vitamin B12 is bonded directly to the __________ of the ribose of adenosine.
22292. 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
22293. An early sign of retinol deficiencies in man is
22294. An enzyme, L-folate reductase reduces folic acid to
22295. What compound of raw egg white causes a syndrome similar to vitamin B deficiency?
22296. The disease Beriberi is due to a dietary deficiency in
22297. Which of these is a symptom of vitamin A deficiency?
22298. Vitamin-C is considered as a
22299. The vitamin niacin is part of the __________ molecule.
22300. Which of these hormones is a catecholamine?
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