What are the three cell layers of retina, and how does the light travel to get to the receptor layer

when foreign dna and plasmid are both cut with the same restriction enzyme and then mixed together, all molecules will form reco

Art [367]

False, Some plasmids may reanneal without taking in any more DNA. when plasmid and foreign DNA are combined after being cut with the same restriction enzyme

Enzymes that cleave DNA are known as restriction enzymes. Each enzyme distinguishes one or more target sequences and cleaves DNA at or close to those sequences.

Numerous restriction enzymes produce single-stranded DNA overhangs at the ends of their cuts, which are often staggered. But some result in blunt endings.

DNA ligase is an enzyme that joins DNA. A single, unbroken DNA molecule can be created by joining two sections of DNA that have matching ends using ligase.

DNA ligase and restriction enzymes are employed in DNA cloning to splice genes and other DNA fragments into plasmids.

An enzyme that cuts DNA and recognises particular DNA locations is known as a restriction enzyme. A number of restriction enzymes make staggered cuts at or near their recognition sites to create ends with a single-stranded overhang.

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6 0

1 year ago

Move the arrows into the correct direction of flow of a rabies virus traveling through a neuron

trasher [3.6K]

Answer:

Dendrite to axon to cell body

Explanation:

Rabies virus is transmitted to human body when an infedted animal bites into human muscles. It enters into neurons via dendrites and travels via axon to cell body.

6 0

4 years ago

Comparing amino acid sequences in proteins has been used to determine the relatedness of organisms. Below is a graphic that show

Tju [1.3M]

Answer:

A) Species A and E are more closely related than either species are related to species D.

B) Between A and B = 99.1%

Between species A and C =97.5%

Between species B and C = 97.3%

Similarity in amino acids sequence reflects similarity in DNA sequence

C) Species A and E are most closely related

D) Species A and E have the most similarity in amino acid sequence, and hence DNA sequence.

Explanation:

A) The amino acid sequences of the protein, keratin, in species A and D has a difference of about 19 whereas species A and E have a difference of only 1. Therefore, it means that keratin in species A and D will have differences in structure whereas between species A and E, they would have almost the same structure.

Also, species D and E have a difference of 20 in their amino acids sequence, therefore, the structure of keratin in both species will have differences in structure.

B) Similarity between A and B:

450 - 4 = 446

In percentage: 446/450 × 100% = 99.1%

Similarity between A and C:

450 - 11 = 439

In percentage: 439/450 × 100% = 97.5%

Similarity between B and C:

450 -12 = 438

In percentage: 438/450 × 100% = 97.3%

The sequence of DNA of species determines their amino acid sequences because information in DNA is transcribed to RNA which are then used to make proteins. Therefore, if a species are very closely related, they are expected to have very similar genetic sequences and thus proteins too. This is reflected in similarity between amino acid sequences in their proteins.

C). Species A and E are most closely related.

D) Species A and E have only a single difference in their amino acids sequence for Keratin. This translates to about 99.7% similarity which is the highest among all the species compared. Therefore, species A and E are most closely related.

7 0

3 years ago

If a horticulturist breeding gardenias succeeds in having a single plant with a particularly desirable set of traits, which of t

Mrrafil [7]

<h2>Answer is option "C"</h2>

Explanation:

To clone a plant means to create an identical copy of an adult plant. These identical copies become young plants that in turn become adult plants that can be cloned again. This process can go on indefinitely
The most common method of cloning plants and the one that has been used for a very long time is that of taking cuttings from an adult plant. A cutting is a stem or leaf that is cut from an adult plant. The cutting is then planted into moist soil or other moist growing media. The cutting will produce roots of its own and then become a whole new plant identical to the original adult plant. Not all plants can be cloned via cuttings, though
Vegetative proliferation works in light of the fact that the finish of the cutting structures a mass of non-particular cells called a callus. With karma, the callus will develop, gap and structure different specific cells (roots, and so on.), in the end framing another plant
Hence, the right answer is option C "Clone the plant"

6 0

4 years ago

All the members of a single species that occupy a particular area at the same time are known as a:_____.

Licemer1 [7]

All the members of a single species that occupy a particular area at the same time are known as a Population.

<h3>What are the levels of organization in an ecosystem?</h3>

According to researchers, there are 5 levels of an ecosystem: Organism, Population, Community, Ecosystem and Biosphere.
An organism is a single living being such as a frog.
A population forms a group of organisms of the same species that live in the same place at the same time. E.g.: a group of frogs living in a well.
A community consists of all the populations of different species that live in a given area at the same time.
An ecosystem consists of all the organisms in an area, and the abiotic factors influencing that area.
The biosphere consists of all the ecosystems on earth linked together.

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7 0

2 years ago