RNA polymerase recognoses and binds to the promoter region. Promoter regions have consensus sequences known as pri TATA box with 3-5 sequence. The promoter regions identifies the start site of transcription and then arranges enzymes on the template strand.
RNA polymerases sepqarates two strands of DNA to the base sequence of the template. Transcription starts at the +1 base pair and the sigma factor is in turn released the moment transcription starts. The core polymerase continues moving along the template strand in the 3'-5' direction, by convention. Eventually, RNA polymerase reaches the transcription termination signal where it ceases trascription and produces complete and mature RNA molecule. There are two kinds of transcription terminators in prokaryotic cells; RHO independent terminator and RHO dependent terminator.
HOSEA KIPYEGON answered the question on November 13, 2019 at 09:14
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Discuss three RNA polymerases that are required for transcription to take place citing their functions.
(Solved)
Discuss three RNA polymerases that are required for transcription to take place citing their functions.
Date posted:
November 13, 2019
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Identify the major processes involved during the transcription process of DNA to mRNA.
(Solved)
Identify the major processes involved during the transcription process of DNA to mRNA.
Date posted:
November 13, 2019
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Discuss the dogma of molecular biology
(Solved)
Discuss the dogma of molecular biology
Date posted:
November 13, 2019
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Explain why transcription and translation occurs simultaneously in prokaryotic cells
(Solved)
Explain why transcription and translation occurs simultaneously in prokaryotic cells
Date posted:
November 13, 2019
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Define the following terms used in genetics:
a. Replication
b. Translation
c. Transcription
(Solved)
Define the following terms used in genetics:
a. Replication
b. Translation
c. Transcription
Date posted:
November 13, 2019
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i) In fruit flies, the gene for red eyes (R) is dominant over the gene for white eyes (r). If a true breeding red eyed...
(Solved)
i) In fruit flies, the gene for red eyes (R) is dominant over the gene for white eyes (r). If a true breeding red eyed female is mated with a true breeding white eyed male, all the offspring are red eyed. However, if a true breeding white eye female is mated with a red eyed male, all the female offspring will be red eyed and the male offspring will be white eyed. Explain this apparent contradiction using genetic crosses.
ii) Work out the ratio of the expected phenotypes of a red eyed female offspring from
the above crosses and a red eyed male.
Date posted:
November 13, 2019
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Distinguish between the terms; homozygous and homozygote.
(Solved)
Distinguish between the terms; homozygous and homozygote.
Date posted:
November 13, 2019
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Explain how the mammalian eye performs each of the following:-
i) Focusing far objects.
ii) Adjustment of the amount of light entering the eye in dim light...
(Solved)
Explain how the mammalian eye performs each of the following:-
i) Focusing far objects.
ii) Adjustment of the amount of light entering the eye in dim light conditions.
Date posted:
November 13, 2019
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Answers (1)
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In which part of the retina is the image formed mostly sharply during conditions of high light intensity.
(Solved)
In which part of the retina is the image formed mostly sharply during conditions of high light intensity.
Date posted:
November 13, 2019
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Name four strengthening tissues in woody stems.
(Solved)
Name four strengthening tissues in woody stems.
Date posted:
November 13, 2019
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Below is a diagram showing the fore arm bones and muscles covering them.
(Solved)
Below is a diagram showing the fore arm bones and muscles covering them.
a) Name the bones represented by; T X Y Z
b) Name the joints formed between;
i) T and X
ii) Y and X
c) Name the muscles labeled P and R.
d) What happens to each muscle as the arm is straightened.
P...................
R..................
Date posted:
November 13, 2019
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A solution of sugar cane was boiled with a small amount of dilute hydrochloric acid and allowed to cool. Sodium hydrogen carbonate solution was added...
(Solved)
A solution of sugar cane was boiled with a small amount of dilute hydrochloric acid and allowed to cool. Sodium hydrogen carbonate solution was added drop by drop until the fizzing stopped. A few drops of benedicts solution were added to the mixture and boiled. An orange precipitate formed at the end of the experiment.
a) What was the role of the following in the experiment;
i) Dilute hydrochloric acid.
ii) Sodium hydrogen carbonate.
b) What conclusion can be drawn from the above experiment?
c) Where was the food substance identified in the experiment produced?
d) Name the substance found in human digestive system that performs the same function as Hydrochloric acid.
e) State two properties of the substance identified in (b) above.
Date posted:
November 13, 2019
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The following diagrams represent embryonic stages of development for various organisms.
(Solved)
The following diagrams represent embryonic stages of development for various organisms.
a) Name the type of evidence for organic evolution depicted in the diagram.
b) Explain the evidence in (a) above.
Date posted:
November 13, 2019
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Answers (1)
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Below is a diagram of an organism
(Solved)
Below is a diagram of an organism
(a) Identify the kingdom to which the organism belongs.
(b) State the functions of the structures labelled F and G.
(c) Name the material that makes the cell wall of the organism.
Date posted:
November 13, 2019
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Answers (1)
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The diagram below shows some growth in a plant.
(Solved)
The diagram below shows some growth in a plant.
a) Name the type of growth shown in the diagram.
b) Name the part labeled A
c) What is the function of the part labeled B
Date posted:
November 13, 2019
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Answers (1)
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State two ways through which proteins are assimilated in the body
(Solved)
State two ways through which proteins are assimilated in the body
Date posted:
November 13, 2019
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Explain why a rat has a higher food intake compared to a lizard of the same body weight.
(Solved)
Explain why a rat has a higher food intake compared to a lizard of the same body weight.
Date posted:
November 12, 2019
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State two major roles of the kidney.
(Solved)
State two major roles of the kidney.
Date posted:
November 12, 2019
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Why is a pyramid of biomass a more accurate way of representing the amount of organic matter present in each trophic level as compared to...
(Solved)
Why is a pyramid of biomass a more accurate way of representing the amount of organic matter present in each trophic level as compared to the pyramid of numbers?
Date posted:
November 12, 2019
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Answers (1)
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The diagram below represents a section through a chloroplast as seen under the electron microscope.
(Solved)
The diagram below represents a section through a chloroplast as seen under the electron microscope.
(a) Name the structure labelled D.
(b) In which labelled structure do we find chlorophyll molecule.
(c) Name the structure labelled, where carbon IV oxide fixation occurs.
Date posted:
November 12, 2019
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Answers (1)