At 5 am your alarm goes off. Genes are expressed in response to that stimulus and...
At 5 am your alarm goes off. Genes are expressed in response to that stimulus and you throw the clock out the window. How are several different genes expressed simultaneously?
a) What are promoters?
b) How do promoters control gene expression?
c) What molecules are involved?
d) Which moleculasare cis factors? Which moleculesare trans factors?
e) What would be common about the promoters for the different genes above??
tRNA and rRNA genes are involved in protein synthesis and yet do not code for protein. Explain
a) what is a gene? what is made from a gene?
b) What does the rRNA gene produce ?
c) What does that gene product do?
d) What does the tRNA gene produce ?
e) What does that gene product do?
Homework Answers
) What are promoters?
These are the sequences at which RNA polymerase binds to start the transcription.
b) How do promoters control gene expression?
Promoters allow RNA polymerase to bind to it and thus start the process of transcription. These are the regulatory sequences located upstream of the gene.
c) What molecules are involved?
Transcription factors, RNA polymerase , mRNA are required for the process of transcription.
d) Which moleculas are cis factors? Which molecules are trans factors?
The molecules which regulate the transcription of gene and which are located on the same chromosomes. The molecules which are located on the on another chromosome and regulate the transcription are called trans factors.
e) What would be common about the promoters for the different genes above??
Promoters are regulated by various transcription factors. They are located upstream of the gene.
tRNA and rRNA genes are involved in protein synthesis and yet do not code for protein. Explain
a) what is a gene? what is made from a gene?
Segment of DNA which codes for a protein.
b) What does the rRNA gene produce ?
rRNA will produce ribosomal RNA. These help in translation.
c) What does that gene product do?
rRNA helps in translation. mRNA binds to the ribosomal RNA and the process of translation starts.
d) What does the tRNA gene produce ?
It will produce transfer RNA.
e) What does that gene product do?
This tRNA helps in bringing the complementary amino acids for translation.
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