Question

QUESTION 1

Hox genes are genes that code for transcription factors. What do transcription factors do?

A. Bind to DNA to make it available for transcription

B. Make up specific body parts

C. Activate ribosomes

QUESTION 2

Genes that need to be turned on at the same time (for example, the genes that encode the proteins that build toes) will all respond to the same transcription factor.

A. True

B. False

QUESTION 3

Hox genes are sometimes called "master switches". They have acquired this nickname because a single Hox gene will turn on (or off) several related genes. That means that a single Hox gene cannot have a large effect on phenotype.

A. True

B. False

QUESTION 4

A developing embryo is composed of millions of cells that have to work in a coordinated fashion to differentiate themselves into unique body parts.

An embryonic cell that will develop into a brain cell has  ___________DNA as a cell that will develop into a skin cell.

A. the same

B. different

QUESTION 5

A developing embryo is composed of millions of cells that have to work in a coordinated fashion to differentiate themselves into unique body parts.

An embryonic cell that will develop into a brain cell has __________chromatin modifications as a cell that will develop into a skin cell.

A. The same

B. Different

Answer 1

1 Bind to DNA to make it available for transcription- transcription factors binding with DNA forms a pre-initiation complex which initiates transcription.

2 true- there are general transcription factors that can activate upon all cells.

3 true- hox gene serves as switch on and off factor and it has large effect on phenotype.

4 same- DNA is present same in all cells throughout the body. cells differentiation takes place by expression of specific genes depending on type of cell.

5 different modifications can only make expression of genes differs from cell to cell.