Question

Question 20 TFIID is a. a protein and a transcription factor. b. an enzyme. c. a promoter and a transcription factor. d. a promoter. e. part of the TATA box.

Answer 1

Question 20: The correct answer is a. a protein and a transcription factor.

Explanation: Transcription Factor II D (TFIID) is considered as a protein and transcription factor that binds to the TATA box of the promoter to facilitate the binding of other transcription factors required for the transcription process.

Question 19: The correct answer is b. be passed on from one generation to the next.

Explanation: Maintenance methylation can be defined as a methylation process by which the methyl groups are added to the newly synthesized strand of DNA after the replication process (i.e. the hemimethylated DNA because the parent strand is already methylated). Maintenance methyltransferases do this job. So, without maintenance methyltransferase, the methylation patterns would not be copied after the DNA replication process.

Question 18: The correct answer is a. Tryptophan.

Explanation: A corepressor can be defined as a small molecule that activates a repressor. In trp operon, tryptophan acts as a corepressor. The tryptophan bound repressor binds to the operator, and thus it blocks the attachment of RNA Polymerase to the promoter of the gene.

Question 10: The correct answer is e. Groups of prokaryotic genes are likely to be regulated together, whereas each eukaryotic gene is usually regulated separately.

Explanation: Prokaryotic genes are usually grouped into an operon, therefore they are likely to be regulated together. But in Eukaryotes, that is not the case. So, each eukaryotic gene is usually regulated separately.