Can someone help with biology please?

3. Which of the following must happen for transcription of the lac operon genes to take place?





The repressor protein falls off the DNA molecule, and RNA polymerase binds to the promoter.


The repressor protein binds to the DNA molecule, and RNA polymerase falls off.


Lactose is removed from the system.


The repressor protein binds to the promoter sequence.








4. What is a clue that the lac operon is on?





The repressor protein has fallen off the molecule.


RNA polymerase is blocked by the repressor.


The cell membrane changes.


Lactose is absent.








5. How is the cell in Diagram B effectively using its resources?








RNA polymerase is transcribing the genes since lactose is present.


Since lactose is present, the repressor protein will begin transcription.


Since lactose is absent, the repressor protein is blocking the genes and stopping transcription.


The cell continually produces the enzymes needed to break down lactose.








6. If scientists were trying to construct recombinant DNA molecules, how would they do it?








by using RNA from plants


by combining the RNA of two different organisms


by combining the DNA of two different organisms


by combining the proteins from two different organisms








7. Scientists involved in biotechnology sometimes insert the DNA of one organism into a second organism. Which of the following best explains why they do this?








to stop the organisms' gene expression


to create new species of organisms


to cause the second organism to produce proteins


to make new cell membranes








8. How is the information in a DNA molecule expressed in an organism?








through recombinant DNA


through proteins


through plasmids


through RNA polymerase








9. Cells in your hair follicles produce the protein keratin, which is a primary component of hair. Cells in your liver do not produce keratin. What is the reason this specialization occurs?








Different types of genes are activated in liver cells and hair follicle cells.


Hair follicle cells contain different genes from liver cells.


Hair follicle cells do not produce DNA, but liver cells do.


Hair follicle cells contain recombinant DNA.








10. During the time period when a human embryo is developing, the embryo produces a special type of hemoglobin not found in infant, child, or adult blood. What best explains how an embryo can produce a different type of hemoglobin from an infant, child, or adult?








Humans have genes for the different types of hemoglobin, which are expressed at different times.


The embryo has different genes from the infant, child, or adult.


Development and differentiation result in the loss of certain genes.








11. Of the following, which best explains the term gene expression?





the suppression of polymerase


the production of lipids


the suppression of protein synthesis


the production of proteins based on the genetic information in DNA








12. Which molecules in eukaryotic cells regulate gene expression?





transcription factors


recombinant DNA


plasmids


lactose








13. If a chemical interfered with the ability of RNA polymerase to bind to a DNA molecule, what would be the result?








DNA would not replicate.


Transcription would not take place, and the protein would not be produced.


The RNA polymerase would be produced.


Transcription would proceed, and a protein would be produced.Can someone help with biology please?
3 The repressor protein binds to the DNA molecule, and RNA polymerase falls off.


5. I can't see the diagram to know....


6 by combining the DNA of two different organisms


7 to cause the second organism to produce proteins


8 through proteins


9 Different types of genes are activated in liver cells and hair follicle cells


11 the production of proteins based on the genetic information in DNA


12 transcription factors


13 Transcription would not take place, and the protein would not be produced