Question

keratin protein keratin protein (coiled-coils) (coiled-coils) If muscle cells expressed hair genes If RBCS expressed hair genes

Yet, all the cells in your body contain the same genes (and same alleles). The difference across cell types is that genes get selectively expressed (turned on or off) based on the proteins needed for cellular function given their environment.

Select which statement explains the reason why hair does not normally grow on your muscle cells.

	a.	Muscle cells have the gene for keratin, but do not express it
	b.	Muscle cells do not have the gene for keratin and therefore cannot express it
	c.	Muscles cells had the gene for keratin, but deleted it during cell division into muscle tissue

Answer 1

As Per Chegg Policy, Proceeding To Answer A Minimum Of First Question, Or, First 4 Sub-Questions / Parts / Subparts, That Is, In This Case Only Question 1 To Question 4, Unless Specified/Indicated To Do 4 Specific Questions By The Question Uploader:

Question 1
Muscle cells have the gene for keratin, but do not express it. There are many gene regulatory processes like heterochromatinisation, nucleosome histone modifications, RNA expression changes and epigenetic mechanisms which prevent certain cell type from expressing certain genes.

Question 2
E. coli not expressing its lactose-metabolising enzymes when only glucose is around it is the most energy-conserving mechanism as the extra machinery for lactose metabolism should only come into effect when the primary substrate (in this glucose is not available).

Question 3
Promoter - C
Operator - A
Genes of Operon - B
Regulator Gene - D

Question 4
When the repressor protein is binding to the Operator, the genes will not be transcribed.
When the repressor protein is not binding to the Operator, the genes will be transcribed.