Any on these questions would be greatly appreciated.
1. which statement is the most accurate?
a. all cells have the same genes, and all of a cell's genes are active at the same time.
b. as cells and tissues differentiate, they produce new genes.
c. all cells have the same genes, but different genes are active in different cells.
d. your hair is different from your kidneys because the cells that make up your hair and your kidneys have different genes
2. select the diagram that shows a system in which the lac operon genes are about to be transcribed.
a. diagram a because the repressor protein is ready to transcribe the genes.
b. diagram b because the repressor protein is ready to transcribe the genes.
c. diagram a because the repressor protein is no longer attached to the dna segment.
d. diagram b because there is no lactose present.
3. what must happen for transcription of the lac operon genes take place?
a. the repressor protein binds to the promoter sequence.
b. the repressor protein binds to the dna molecule, and rna polymerase falls off.
c. the repressor protein falls off the dna molecule, and rna polymerase binds to the promoter.
d. lactose is removed from the system.
4. which of the following clues would tell you if the lac operon is on?
a. the cell membrane changes.
b. lactose is absent.
c. rna polymerase is blocked by the repressor.
d. the repressor protein has fallen off the molecule.
5. how is the cell in diagram b effectively using its resources?
a. the cell continually produces the enzymes needed to break down lactose.
b. since lactose is present, the repressor protein will begin transcription.
c. since lactose is absent, the repressor protein is blocking the genes and stopping transcription.
d. rna polymerase is transcribing the genes since lactose is present.
6. how do scientists construct recombinant dna molecules?
a. by combining the proteins from two different organisms.
b. by combining the rna of two different organisms.
c. by combining the dna of two different organisms.
d. by using rna from plants.
7. scientists involved in biotechnology sometimes insert the dna of one organism into a second organism. what is the purpose of this process?
a. to create different traits in the same species.
b. to cause the second organism to produce proteins.
c. to reverse the organisms' gene expression.
d. to make atp.
8. how does an organism express information in a dna molecule?
a. through proteins.
b. through dna polymerase.
c. through existing dna.
d. through membranes.
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. why does this specialization occur?
a. different types of genes are activated in liver cells and hair follicle cells.
b. hair follicle cells contain recombinant dna.
c. hair follicle cells contain different genes from liver cells.
d. hair follicle cells do not contain dna, but liver cells do.
10. when a human embryo is developing, the embryo produces a special type of hemoglobin not found in infant, child, or adult blood. why does an embryo produce a different type of hemoglobin from an infant, child, or adult?
a. development and differentiation result in the loss of certain genes.
b. the embryo has different genes from the infant, child, or adult.
c. humans have genes for the different types of hemoglobin, which are expressed at different times.
11. of the following, which best describes the term 'gene expression'?
a. the production of proteins based on the genetic information in dna.
b. the suppression of protein synthesis.
c. the suppression of polymerase.
d. the production of lipids.
12. choose the molecules in eukaryotic cells that regulate gene expression.
a. atp.
b. transcription factors.
c. polymerase factors.
d. recombinant dna.
13. what would happen if a chemical interfered with the ability of rna polymerase to bind to dna molecule?
a. the rna polymerase would cut the dna molecule in half.
b. transcription would not take place, and the protein would not be produced.
c. transcription would proceed, and a protein would be produced.
d. the dna molecule would replicate itself.