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Masja [62]
3 years ago
8

Why arteries have thick and elastic muscular walls?

Biology
1 answer:
valkas [14]3 years ago
4 0

The thick, elastic walls allow the heart to withstand the pressure waves from the strong blood pressure. Veins have thinner ones because they don't receive much pressure.

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28. What are some possible consequences of a mutation? Give a specific example for each consequence you list. 29. You are a scie
Varvara68 [4.7K]
<span>For prokaryotes, most regulatory proteins are negative and therefore turn genes off. It is beneficial by: Vary the numbers of specific enzymes made (regulation of gene expression) Slow, but can have a dramatic effect on metabolic activity Regulate enzymatic pathways (feedback inhibition, allosteric control) Rapid and can be fine-tuned, but if the enzyme system does not have this level of control, then it is useless Prokaryotes are "simple," single celled organisms, so they have "simple" systems Genes are grouped together based on similar functions into functional units called operons MANY GENES UNDER ONE CONTROL!!! There is one single on/off switch for the genes</span> The gene that contains information for the production for that particular enzyme is cut out from a normal person's DNA using special restriction enzymes, which produces 'sticky ends' on the gene. Next, a plasmid (a small molecule of DNA) is removed from a bacteria and mixed with the above gene in the presence of the same restriction enzyme to allow the human gene to fit into the plasmid. Then, heat / electricity is applied to the bacteria to open up the cell membrane so that the plasmid can enter the bacteria. This genetically modified bacteria, now being able to produce that particular enzyme, may be allowed to reproduce in large numbers for the large-scale production of that enzyme for human use.<span><span>answer for question 28 
No change occurs in phenotype.
Some mutations don't have any noticeable effect on the phenotype of an organism. This can happen in many situations: perhaps the mutation occurs in a stretch of DNA with no function, or perhaps the mutation occurs in a protein-coding region, but ends up not affecting the amino acid sequence of the protein.</span><span>Small change occurs in phenotype.
A single mutation caused this cat's ears to curl backwards slightly.</span><span>Big change occurs in phenotype.
Some really important phenotypic changes, like DDT resistance in insects are sometimes caused by single mutations. A single mutation can also have strong negative effects for the organism. Mutations that cause the death of an organism are called lethals — and it doesn't get more negative than that.
answer for question 29 
</span></span> <span>The gene that contains information for the production for that particular enzyme is cut out from a normal person's DNA using special restriction enzymes, which produces 'sticky ends' on the gene. Next, a plasmid (a small molecule of DNA) is removed from a bacteria and mixed with the above gene in the presence of the same restriction enzyme to allow the human gene to fit into the plasmid. Then, heat / electricity is applied to the bacteria to open up the cell membrane so that the plasmid can enter the bacteria. This genetically modified bacteria, now being able to produce that particular enzyme, may be allowed to reproduce in large numbers for the large-scale production of that enzyme for human use.
</span>answer for question 30
<span>Gene regulation is needed in the development of multi-cellular organisms because the complexity of animals and plants depends on a remarkable feature of the genetic control system. Cells have a memory: the genes a cell expresses and the way it behaves depend on the cell's past as well as its present environment.
</span>answer for question 31
<span>Pedigree shows genotypes and phenotypes being passed down by generations. Karyotypes show the chromosomes of an individual person
answer for question 32
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5 0
3 years ago
Commercial utilization of microbial products has become increasingly popular due to their environmentally friendly nature. Remov
Trava [24]

Answer:

Enzymes

Explanation:

The products that are derived from microbial organisms can be removed from the environment by enzymes, which are molecules that can be degraded or inactivated easily by certain changes of temperature, pH, salinity, etc. What makes them a good option for an environmentally friendly product.

8 0
3 years ago
In the spring of 2010, there was a catastrophic explosion on an ocean oil drilling rig, causing millions of
4vir4ik [10]
<span>(1) Larger organisms eat the shellfish and more chemicals will build up in their tissues.</span>
4 0
3 years ago
How are carbohydrate polymers formed?
Morgarella [4.7K]
Dehydration synthesis :) it means that monomers (like glucose or lactose) when bonded together release water molecules
5 0
3 years ago
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PLSSSSSSS HELPPPPPPP I WILL GIVE BRAINLIESTTTTTTTTTT!!!!!!!!!!!!!!!!!!!!!PLSSSSSSS HELPPPPPPP I WILL GIVE BRAINLIESTTTTTTTTTT!!!
sergejj [24]

Active Immunity is natural.

Passive Immunity is maternal.

Active Immunity from Vaccination.

Passive Immunity is Artificial.

Passive Immunity:

   Does not require previous exposure to a disease agent

   Takes effect immediately

   Does not last long (up to a few months)

Active Immunity is produced inside of the body, whereas passive immunity is introduced from outside of the body.

Active Immunity is from direct infection and vaccination.

Passive Immunity is from Breast milk, Injection, Mother to baby through the placenta.

Active Immunity takes effect over time (typically several weeks).

Passive Immunity takes effect immediately.

Active Immunity's length of efficacy is Long-term to lifelong.

Passive Immunity is short-term.

Active Immunity is produced by memory cells, Passive Immunity is not.

Hope this was insightful and enough information.

6 0
3 years ago
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