Question

Gene expression in eukaryotic cells is controlled by transcription factors, which are ________.
A. carbohydrates
B. proteins
C. lipids
@petiteme

Answer 1

A transcription factor (sometimes called a sequence-specific DNA-binding factor) is a protein that binds to specific DNA sequences.

Answer 2

In the picture below, X represents part of mRNA that is spliced out because it does not code for any amino acid (protein). What does X represent?

A. DNA
B. introns
C. proteins

- The picture I attached below should help you with this question. @petiteme

Answer 3

Introns are removed by RNA splicing.

Answer 4

Lactose, a sugar found in milk products is broken down by enzymes. The making of these enzymes is controlled by a genetic system in E. coli. When there is no lactose present in the body, the repressor protein blocks RNA polymerase from binding to the promoter, making __________ impossible.

A. Transcription
B. Translation
C. Replication
@petiteme

Answer 5

I'd guess it is transcription ^_^

Answer 6

Genetic engineering has produced goats whose milk contains proteins that are produced by bacteria and can be used as medicines. This is possible because ...

A. Adding the medicine bacterial genes into the goats’ milk will cause the bacteria to produce the medicine in the milk.

B. DNA in bacteria and goats are made up the same components so the medicine gene in bacteria can be combined with the goat’s genes so the goat produces the medicine in the milk.

C. Injecting bacterial genes into the goats’ udder will cause the bacterial DNA to override the goat’s DNA so the goat will produce the medicine in the milk.

@petiteme

Answer 7

Not sure with this :( I'd guess it's B.

Answer 8

Plasmids, which are used in recombinant DNA, are circular pieces of DNA that are separated from the main DNA. Where would you find plasmids?

A. In animal cytoplasm
B. In plant nuclei
C. In bacterial cytoplasm
@petiteme

Answer 9

They are found in a bacterial cell.

Answer 10

Using genetic engineering, human insulin genes are inserted into bacterial DNA so bacteria produces human insulin. What is the reason for inserting the genes into bacteria and not animals or plants?

A. Bacteria reproduce quickly passing the insulin genes to their offspring. The result is large amounts of insulin are produced rapidly.

B. Plants and animals cells cannot accept other organisms DNA into their genome so they would be unable to produce insulin.

C. Plants and animals would produce too much insulin which would be toxic to the organism.

@petiteme

Answer 11

I'd guess C. Lol. Sorry ^_^