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Mumz [18]
3 years ago
7

True or false if false make it true only need question 19 plz Help meee!!!

Biology
1 answer:
anyanavicka [17]3 years ago
6 0

Answer:

False

Explanation:

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Usatestprep--According to the model, what is the role of maltose in the maltose operon?
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Answer:

<u>Inducer</u>

<u></u>

Explanation:

Structural proteins within bacteria are encoded along with their functions. These are typically found in a block of genes called an operon. They undergo transcription together with the use of a single promoter sequence to form a polycystronic transcript- this allows for the simultaneous control and regulation of biochemical pathways. This is efficient as these pathways would either need to function together when "switched on" or will not be needed when "switched off". Repressors are proteins that effectively hinder translation by binding to DNA at the operator site, blocking the activity of RNA polymerase in transcription. However inducers are small molecules that can displace these, freeing up the operon for transcription and the activation of relevant biochemical pathways.

The mal operon includes genes which mediate the breakdown of the substrate maltose in bacterial cells. Maltose, called a malt sugar, is a carbohydrate compound made up of two glucose molecules joined by an α-(1,4) glycosidic linkage.

In the presence of maltose, the inducer binds to the activator. This then allows for the binding of RNA polymerase, which facilitates translation and th epr

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3 years ago
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People who have leukemia, a cancer that affects white blood cells, are often given Cytrabine. This drug inhibits the synthesis o
OLga [1]

People who have leukemia, a cancer that affects white blood cells, are often given Cytrabine. This drug inhibits the synthesis of DNA.

S-phase of cell cycle is most affected by Cytrabine because cytrabine interfers with synthesis of DNA and we know that in S-phase of cell cycle synthesis of DNA takes place.

5 0
3 years ago
Laws differ from theories because laws do not provide
Alborosie
Laws can be tested over and over and their results will still be the same, and laws cannot be disproved. Theories can always be disproved beause they are tested and experimented continously and results can change. Laws can't be theories but theories can be turned to laws. Hope this helps, didn't know an exact answer to that but I hope you can draw your answer from this information.
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3 years ago
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Which of the following is (are) part of a systemic immune response?
viktelen [127]

Answer:

The answer is I ,II and III

5 0
2 years ago
Many useful products, mainly for medical purposes, are produced by cloning human genes into other organisms, which then mass-pro
ANEK [815]

Answer:

The correct answer is : A.

Explanation:

  • This is because of the following reasons:
  1. Escherichia coli is a bacteria and hence is a prokaryote.
  2. The cloning of human (eukaryote) genes is done to obtain in-vitro protein expression which are to be used a pharmaceutical compounds.
  3. Although the phenomenon of Central Dogma takes place in both Prokaryotes and Eukaryotes, the mechanism is very different.
  4. Some of the differences includes:
  • Eukaryotic genes contain certain non-protein encoding sequences called the Intron sequences which needs to be removed from the transcribed mature mRNA by Spliceosome. This phenomenon is absent in prokaryotes as they do not possess introns. Hence, proper processing of eukaryotic mRNA is not possible in prokaryotes.
  • The mature eukaryotic mRNA has a 5' cap and 3' polyadenylated tail which is added by a capping enzyme and a poly-A polymerase enzyme to increase their stability. This will not be possible in a prokaryote as they lack these enzymes.
  • The translation of membrane proteins and secretory proteins is carried on by the ribosomes bound to the endoplasmic reticulum. This structure is absent in prokaryotes, hence they will be unable to produce a proper polypeptide sequence.
  • Finally, the eukaryotic proteins undergo various modifications after formation, like methylation, acetylation, etc. These reactions cannot be carried out in a prokaryote as they lack the respective enzymes.
  • Hence, we see a properly folded functional eukaryotic protein cannot be produced in a prokaryote.

6 0
3 years ago
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