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Softa [21]
3 years ago
5

Which of the following is not true about cells? 1)All living thing begins life as a single cell. 2)The cell is the basic unit of

the structure and function of life. 3)It takes many cells to make a complex organism. 4)All living cells always come from other living or dead cells.
Biology
1 answer:
Gekata [30.6K]3 years ago
7 0
<span>4)All living cells always come from other living or dead cells.</span>
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Marvin blows up a balloon but lets go of it. The air inside is released and the balloon goes up into the air. What best describe
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The thrust of the air propels the balloon in the opposite direction

Explanation:

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When comparing genomes from different species, scientists are often interested in the genome density, or the number of genes per
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The human genome density ranges between 12-15 genes per Megabase pairs. This is because humans have approximately 2000 genes in a total of approximately 3 billion base pairs. However, some primitive organisms have an even larger gene density than humans. An example is bacteria with gene densities ranging between 100 – 500 genes/Mb. Gene density is therefore not a good characteristic in determining the complexity of an organism.






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E. coli DNA polymerase III is both highly accurate and highly processive. a) Describe how Pol III avoids the incorporation of im
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Answer/Explanation:

DNA polymerase is the enzyme responsible for replicating DNA. It is hugely important that is performs its functions accurately, as if incorrect bases are incorporated this can lead to mutations that disrupt the structure and function of genes. It adds nucleotides in a 5' - 3' direction only.

DNA polymerase III also has high processivity, which means that for every time it binds DNA, it is able to add many bases before it becomes dissociated.

A. DNA polymerase avoids the incorporation of improperly paired nucleotides in two ways:

  • The first way depends on the structure of the enzyme. If the nucleotide that the enzyme is in the process of adding is not complementary to the template, then the nucleotide will not align with the template, and thus it is more inefficient to add. This inefficiency means the nucleotide is more likely to leave the active site before it is added, and DNA polymerase can replace it with the correct nucleotide.
  • It also has proofreading capabilities. This means, when an incorrect base is added, it recognises the error and can fix this. It can do this because it possesses 3'-5' exonuclease activity. That means, it can chop out incorrectly added bases.

B. Ribonucleotides are the nucleotides that are incorporated into a growing RNA molecule. They are different from deoxyribonucleotides because of the differences in the sugar backbone (ribose vs deoxyribose). Their incorporation would disrupt the structure and function of the DNA, leading to problems with transcription and replication.

DNA polymerase avoids incorporating these nucleotides primarily because of the structure of the enzyme. Ribonucleotides cannot fit into the active site of DNA polymerase due to what is called a "steric filter" or "steric gate". This gate/filter function is performed by specific amino acid residues which usually have a bulky side chain and thus block the incorporation of the 2'OH of the ribose sugar (which is lacking in the deoxyribose sugar)

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Suppose you want to design and build a house how would you communicate your design plans with the construction crew that would w
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First i would like to discuss the design with the head of the construction crew that are capable of understanding the engineering part, then ask him if the design is feasible, if its realistic, if it is safe to be house and if it is safe to work on by the workers. and it would be his task to deliver it the others
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