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dmitriy555 [2]
3 years ago
10

Bundles of axons from ganglion cells make up the __________.

Biology
2 answers:
Ronch [10]3 years ago
5 0
I believe the answer is <span>optic nerve
</span><span>optic nerve nerves is nerves that functioned to connect the impulses from our brain to our retina and vice versa, which created the 'vision' that we get from our eyes when we look at something. On average, a human retina could possess around</span><span> 770,000 and 1.7 million Axons.</span><span>

</span>
laila [671]3 years ago
3 0
I want to preface this by saying that I took Anatomy and Physiology freshman year and forgot a good chunk, but I think it's the basal ganglia...
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A DNA fragment is introduced into the lacZ gene of a plasmid, which also contains an ampicillin resistance gene. What is the app
zhenek [66]

Answer: The bacteria transformed with this particular plasmid will form white colonies on the plates containing ampicillin and Xgal.

Explanation: The lacZ gene produces an enzyme called β-galactosidase which is responsible for the breakdown of lactose into glucose and galactose. The lacZ gene is one of the three genes (the other two being lacA and lacY) of the lac operon which is responsible for the transport and mechanism of lactose in E. coli and many other bacteria.

In recombinant DNA technology, when a plasmid is to be used to transform a host cell, such markers are used to help screen the transformed cells from the ones that have not taken up the plasmid. Xgal present in the plates is an artificial substrate which is hydrolyzed by

β-galactosidase into 5-bromo-4-chloro-indoxyl which will dimerize and oxidise into 5,5'-dibromo-4,4'dichloro-indigo. This is a blue pigment which will give blue color to the bacterial cells. Introducing a DNA fragment in this lacZ gene will make it non-functional so it will not be able to produce the enzyme.

Therefore, when a bacterial cell is transformed with a plasmid containing ampicillin resistance gene and a DNA fragment introduced in the lacZ gene and then grown on plates containing ampicillin and Xgal, white colored colonies will appear. The white colonies will show the bacterial cells that have successfully taken up the plasmid with the DNA fragment incorporated in the lacZ gene as this will render the gene non-functional and will not produce β-galactosidase which will breakdown Xgal to give blue colonies. Since the plates contain ampicillin, only the bacterial cells that have been successfully transformed with the plasmid ( the ones that have the DNA fragment and the ones without it) will grow as the ampicillin resistance will give them resistance against ampicillin in the plates. The bacterial cells that have not taken up the plasmid will not be resistant to ampicillin and will not form colonies on the plate.

This is called blue-white screening which is used to identify successfully transformed host cells. A picture of this is given in the attachment, taken from the following website:

https://www.mun.ca/biology/scarr/Blue_&_White_Colonies.html

8 0
3 years ago
What is the difference between self-love and selfishness according to Aristotle?
loris [4]
Aristotle finds the good and noble man to be selfish. But from his virtue and righteous behavior emerge gifts that his friends, his homeland, and his own community benefit from. He is a committed person who looks down upon material wealth, but enjoys the benefits of honor and dignity.
7 0
3 years ago
The fine adjustment knob is used to focus an image only on what powers?
mamaluj [8]
It only can focus on high powers
7 0
2 years ago
Read 2 more answers
In maize, a dominant allele A is necessary for seed color, as opposed to colorless (a). Another gene has a recessive allele wx t
Gelneren [198K]

Answer:

  • 1/2 Aa Wx wx (colored seeds, normal starch)
  • 1/2 aa Wx wx (colorless seed, normal starch).

Explanation:

  • A (colored seed) is dominant over a (colorless)
  • Wx (normal starch) is dominant over wx (waxy)

Both loci are independent.

A <em>Aa WxWx </em>individual was test crossed (crossed with a homozygous recessive <em>aa wxwx</em> individual).

  • The homozygous recessive can only produce <em>a wx </em>gametes.
  • The dihybrid individual can produce two types of gametes, all of them with the same frequency because the genes segregate independently: 1/2 <em>A Wx </em>and 1/2<em> a Wx </em>

<u>The possible offspring resulting from the combination of those gametes is:</u>

  • 1/2 Aa Wx wx (colored seeds, normal starch)
  • 1/2 aa Wx wx (colorless seed, normal starch).

7 0
3 years ago
Why would the image of salt water be a solution?
alexandr1967 [171]

Answer:

B. The molecules are evenly spread out

Explanation:

salt is completely soluble in water. Na+ will be surrounded by OH- and Cl- will be surrounded by H+

4 0
3 years ago
Read 2 more answers
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