Biology Help??? Please?

Question

Can anybody help me with these questions for a review quiz. I couldnt find the anwers in my book.

1.Which of the following can regulate gene expression in eukaryotes?
A.lac operons
B.transcription factors
C.plasmids
D.lipids

2.Gene expression can occur at several points along the pathway from DNA to RNA to proteins. In one example of gene expression, the protein insulin must be trimmed to a smaller size. How is this is an example of gene expression?
A.Until the protein is trimmed, the shape of the DNA blocks transcription.
B.Until the protein is trimmed, transcription is blocked by a repressor protein.
C.Until the protein is trimmed, it is not useful to the cell.
D.Until the protein is trimmed, the ribosomes are not active.

3.If a cell loses control of gene expression, what happens?
A.The cell becomes more specialized.
B.The cell can carefully use its resources.
C.Healthy, mature cells develop.
D.Abnormal, unhealthy cells develop.

Answer 1

1: B
2: C, I don't think insulin gene expression is regulated by the amount of trimmed/untrimmed insulin within the cell. Other pathways are involved in that function. Insulin simply isnt usable by the body until it has been properly processed within the cell.
3: D, This can happen in cancer.

Answer 2

1. B
2. C If the protein is already expressed, transcription wasn't blocked, was it....

3. D

Answer 3

1. B (lac operons in prokaryotes, not eukaryotes; for lactose metabolism)
2. B
3. D (especially cell cycle control mechanisms<--> "gene expression" leading to uncontrolled cell growth and proliferation when it is unable to repair damaged DNA nor undergo apotosis.)

Answer 4

1. B - because because they can determine whether a trait will be expressed or not.

2. B.

3. D.