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ratelena [41]
3 years ago
6

There is about 1,000 times as much DNA in a human cell as in a bacterial cell, but only 5 times as many genes. What accounts for

this discrepancy? The DNA packing is much more complex in a prokaryotic cell A human cell has much more non coding DNA Most of the genes in a human cell are turned off Human cells are much larger than bacterial cells
Biology
2 answers:
stira [4]3 years ago
6 0

Answer: there are more non-coding DNA in human cells.

Explanation:

The discrepancy is due to presence of non-coding DNA-introns in the cells of human. Generally not all the  DNA molecules contain genes that codes for proteins in human. Only a fragment, about 1 % , of the DNA molecule contains the genes that codes for protein to be expressed. Larger percentage of the whole segments of the  DNA molecules contains 'Junk' DNA,called introns, which do not code for any protein thus reducing the numbers of genes for coding  in the DNA molecule of  human cells..

Nonetheless they perform other regulatory and control activities  during gene expression for protein synthesis. Example are the promoters and enhancers<u>  </u><u>which provides binding to initiate and promote transcription</u>,Silencers, <u>which provides sites for repressing transcriptions,</u> and Insulators  <u>that provides binding sites for control of transcription by proteins. </u>

<u />

<u>,</u> Thus despite the fact that these genes  do not code for any proteins, their abundant presence (almost 90% in the human DNA),help to control and sustain gene expression.

chubhunter [2.5K]3 years ago
3 0

Answer:

Phenotypic plasticity

Explanation:

Humans have evolved over thousands of years to adapt to various environmental changes. For example, when we are in an environment that requires certain level of adaptation our off spring often formalizes epigenetic traits that lows them to overcome small changes in the environment. Over time certain genes that are turned on may remain on and eventually the ones that are off remains off. This give rise to some genes that "don't work"  after millions of years of such evolution we end up with a complex genome with more DNA than "working genes".

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mina [271]

Answer:

this process creates mutation in a cell"s DNA sequence that leads to an increased variation in the gene pool.

8 0
3 years ago
1. You are studying an integral membrane protein of the plasma membrane. It has a single transmembrane domain and the N-terminal
Drupady [299]

Answer:

A 22 to 25 amino acid sequence present in the central section of the protein, which gives rise to an alpha helix in the membrane is known as the stop-transfer anchor sequence. The sequence plays an essential function in targeting the protein towards the plasma membrane. On the other hand, it also ceases targeting of the protein towards the endoplasmic reticulum, which was started by the signal peptide.  

Thus, the process of translation of the remaining of the protein occurs within the cytosol due to the tethering of the transmembrane domain. In the stop-transfer anchor sequence, the hydrophobic amino acids present are isoleucine and valine. After mutation, these amino acids get converted into arginine and lysine, thus, hydrophilic amino acids replace hydrophobic amino acids in the sequence.  

Due to this, the transmembrane domain cannot be targeted towards an integral part of the plasma membrane by the short transfer anchor sequence, and therefore, now the translocation of the protein will take place towards the endoplasmic reticulum as initiated by the signal peptide at the beginning.  

3 0
4 years ago
During diffusion, molecules move from areas of Higher concentration to areas of Lower concentration. Diffusion does not require
Norma-Jean [14]

Answer:

The diffusion of molecules is a process that happens in our organism and the solutes move in a single direction that is always respected based on the principles of biochemistry.

Solutes always move or diffuse from compartments of higher concentration to those of lower concentration in order to equalize the amount of solute in both compartments and therefore equalize the concentrations.

Explanation:

These processes must take place between two compartments of different concentrations divided by a selective semi-permeable membrane, that is, only the solute passes and diffuses passively or actively without dragging on water or other molecules.

This process occurs in the body in those with hyper concentration of solutes in the blood in pharmacological situations.

8 0
4 years ago
12) Which technology allows strands of DNA to be transferred from the cells of one species into the cells of another species?
emmainna [20.7K]

Gene splicing because they remove specific genes in order to create a transgenic organism.

7 0
3 years ago
Read 2 more answers
How and why does DNA change during meiosis
kotykmax [81]

Answer:

When recombination occurs during meiosis, the cell's homologous chromosomes line up extremely close to one another. Then, the DNA strand within each chromosome breaks in the exact same location, leaving two free ends. Each end then crosses over into the other chromosome and forms a connection called a chiasma.

Explanation:

4 0
3 years ago
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