Question

On chromosomal maps, what does the head of the arrow indicate? Tail? Where are genes shown?

A) Ribosomes, mRNA, tRNA, Head - Transcription start, Tail - Transcription termination, On the chromatin
B) Operons, rRNA, miRNA, Head - Replication start, Tail - Replication termination, On the chromosomes
C) Promoters, mRNA, rRNA, Head - Transcription start, Tail - Transcription termination, On the chromosomes
D) Centromeres, tRNA, snRNA, Head - Translation start, Tail - Translation termination, On the chromatin

Answer 1

On chromosomal maps, the head of the arrow indicates the start of transcription at the promoter, and the tail marks the transcription termination at the terminator. Genes are represented on the chromosomes where these processes take place, with the correct answer being C) Promoters, mRNA, rRNA, Head - Transcription start, Tail - Transcription termination, On the chromosomes.

Step-by-step explanation:

Given the context of transcription, genes start at promoters, where transcription is initiated by RNA polymerase, and end at terminators, where the process terminates. Therefore, genes are shown on the chromosomes where these processes occur. Based on the choices provided and details about transcription and gene structure, the correct answer would be C) Promoters, mRNA, rRNA, Head - Transcription start, Tail - Transcription termination, On the chromosomes. Promoters are regions where RNA polymerase attaches to initiate transcription. The head of the arrow corresponds to the transcription start site, while the tail corresponds to the transcription termination site. The entire process of transcription and the location of genes are on the chromosomes.