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IrinaVladis [17]
4 years ago
14

Skin cells are lost daily even without injury which best describes the purpose of the cell cycle for skin cells in the circumsta

nces
Biology
1 answer:
V125BC [204]4 years ago
7 0
The purpose of the cell cycle is to stope or to prevent cell division when it is not needed and make it happen when it is needed
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A signaling pathway that stimulates cellular growth and division is positively regulated by a GTPase encoded by an autosomally l
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Answer:

The correct answer is: a.

Explanation:

  • A Diploid organism possess two copies ( also called alleles) of each  autosomal gene, of which one copy of the gene is obtained from one of its parents and the other copy from its other parent.
  • During the process of replication, one of the alleles of the GTPase encoding gene undergoes a mis-sense mutation.
  • A Mis-sense mutation can be defined as a non-synonymous mutation in which one of the nucleotide in the sequence of the gene gets altered such that it causes a change in the amino acid encoded by the codon (triplet nucleotide message encoding for a single amino acid)  formed by the mutated nucleotide. A single amino acid change in the protein, if occurs in the functional site of the protein, can render a protein non-functional.
  • Hence, the mis-sense mutation in one of the alleles encoding for the GTPase gene causes the resulting protein produced from the mutated allele to have drastically reduced function (1%).
  • A heterozygous cell is one which has one copy of the normal allele and the other copy of the mutated allele of the GTPase encoding gene.
  • As one copy of the normal GTPase allele is present in such an individual, it can produce the normal GTPase protein that can assist in the process of cell growth and division.
  • Hence, the phenotype(expressed character) of  the heterozygous cell will not be affected due to the mutation and it will be able to grow and divide normally.
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Describe the movement of the tectonic plates in model D. What is this situation called?
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Plates at our planet's surface move because of the intense heat in the earth's core that causes molten rock in the mantel layer to move.It moves in a pattern called a convection cell forms when warm material rises,cools,and eventually sink down.

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Explanation:

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