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posledela
2 years ago
7

Some fish that live in pitch-dark caves have things that look like eyes but do not see.

Biology
1 answer:
qwelly [4]2 years ago
3 0

Answer:

It is adaptation

Explanation:

I had this question on my test last week

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Many useful products, mainly for medical purposes, are produced by cloning human genes into other organisms, which then mass-pro
ANEK [815]

Answer:

The correct answer is : A.

Explanation:

  • This is because of the following reasons:
  1. Escherichia coli is a bacteria and hence is a prokaryote.
  2. The cloning of human (eukaryote) genes is done to obtain in-vitro protein expression which are to be used a pharmaceutical compounds.
  3. Although the phenomenon of Central Dogma takes place in both Prokaryotes and Eukaryotes, the mechanism is very different.
  4. Some of the differences includes:
  • Eukaryotic genes contain certain non-protein encoding sequences called the Intron sequences which needs to be removed from the transcribed mature mRNA by Spliceosome. This phenomenon is absent in prokaryotes as they do not possess introns. Hence, proper processing of eukaryotic mRNA is not possible in prokaryotes.
  • The mature eukaryotic mRNA has a 5' cap and 3' polyadenylated tail which is added by a capping enzyme and a poly-A polymerase enzyme to increase their stability. This will not be possible in a prokaryote as they lack these enzymes.
  • The translation of membrane proteins and secretory proteins is carried on by the ribosomes bound to the endoplasmic reticulum. This structure is absent in prokaryotes, hence they will be unable to produce a proper polypeptide sequence.
  • Finally, the eukaryotic proteins undergo various modifications after formation, like methylation, acetylation, etc. These reactions cannot be carried out in a prokaryote as they lack the respective enzymes.
  • Hence, we see a properly folded functional eukaryotic protein cannot be produced in a prokaryote.

6 0
3 years ago
Which embryonic tissues did the researchers use to establish an effective cell culture?
madreJ [45]

The Human ES Cell Culture or Embryonic Stem Cells. 

They capture the thoughts because they are unforgettable and have an entire limitless developmental capability. After few months of growth, these are extraordinary cells kept maintaining the ability to create another cell ranging from muscle to nerve to blood inside the body. Any cell has the potential that makes up the body. 

4 0
3 years ago
In selective breeding, organisms with desired traits are chosen to be parents of the next generation.
Alika [10]
The answer is true............
6 0
3 years ago
How is pillow lava evidence of<br> sea-floor spreading?
alexdok [17]
Pillow lava is evidence of sea-floor spreading because the lava comes up out of cracks at the mid-ocean ridge and becomes newly formed rock. The farther away you get from the mid-ocean ridge, the older the rock is.
3 0
2 years ago
Which of these is a primary food crop?<br><br> A) Hay <br> B) Cocoa <br> C) Cotton <br> D) Rice
Galina-37 [17]
I think it's answer D: Rice. Rice is probably grown more than any other options for food.
8 0
3 years ago
Read 2 more answers
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