Fill in the blanks with the best word or phrase selected from the list below. No

Question

Fill in the blanks with the best word or phrase selected from the list below. Not all words or phrases will be used;each word or phrase should be used only once. The genes of a bacterial _____ are transcribed into a single mRNA. Many bacterial promoters contain a region known as a(n)_____, to which a specific transcription regulator binds. Genes in which transcription is prevented are said to be _____. The interaction of small molecules, such as tryptophan, with ______ DNA-binding proteins, such as the tryptophan repressor, regulates bacterial genes. Genes that are being _____ expressed are being transcribed all the time. allosteric constitutively induced negatively operator operon positively promoter repressed For each of the following sentences, fill in the blanks with the best word or phrase in the list below. Not all words or phrases will be used;use each word or phrase only. During transcription in ____ cells, transcriptional regulators that bind to DNA thousands of nucleotides away from a gene's promoter can affect a gene's transcription. The _____ is a complex of proteins that links distantly bound transcription regulators with the proteins bound closer to the transcriptional start site. Transcriptional activators can also interact with histone _____ s, which alter chromatin by modifying lysines in the tail of histone proteins to allow greater accessibility to the underlying DNA. Gene repressor proteins can reduce the efficiency of transcription initiation by attracting histone _____ s. Sometimes, many contiguous genes can become transcriptionally inactive as a result of chromatin remodeling, like the ____ found in interphase chromosomes. Acetylast centrosome deacetylase enhancer eukaryotic helicase heterochromatin leucine zipper Mediator operator peroxidise prokaryotic telomere viral

Explanation / Answer

(1) 1: Operon

2: Opertor

3: Regulator

4: Repressed

5: Constitutively

(2) 1: Eukaryotic

2: Mediator

3: Acetylase

4: Deacetylase

5 : Heterochromatin

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