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guajiro [1.7K]
3 years ago
6

Animals and plants cannot directly use all the nitrogen found in our

Biology
1 answer:
Basile [38]3 years ago
3 0
I believe it is “animals and plants caanot directly use all the nitrogen found in our atmosphere”
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DNA within the cell is wrapped around nucleosomes to form chromatin. When chromatin is in the form of a 30 nm fibril, how many c
vodomira [7]

Answer:

The correct answer is option b. "20 H1, 40 H2A".

Explanation:

Chromatin is a complex that protects and condenses the genetic material comprised of DNA and proteins. When chromatin is in the form of a 30 nm fibril, nucleosomes have a regular positioning along the DNA. This means that each nucleosome is associated with a single H1 molecule. Therefore a chromatin containing 20 nucleosomes will have 20 copies of H1 and 40 copies of H2A, because each nucleosome has 2 copies of the core histone H2A.

8 0
2 years ago
Which term names the types of elements usually found in meteorites a.minerals b.gases c.metals d.nonmetals
vesna_86 [32]

Answer:

Minerals

Explanation:

Gases are natural and in the ground, metals are also in the ground as are non metals -just look at dirt- and minerals are usually found in geodes, which are usually fallen bits of asteroid and meteorite that has survived earth's atmosphere

4 0
2 years ago
What is difference between Microtubules and Microflaments?
Nina [5.8K]

Microfilaments

Microfilaments are fine, thread-like protein fibers, 3-6 nm in diameter. They are composed predominantly of a contractile protein called actin, which is the most abundant cellular protein. Microfilaments' association with the protein myosin is responsible for muscle contraction. Microfilaments can also carry out cellular movements including gliding, contraction, and cytokinesis.

Microtubules

Microtubules are cylindrical tubes, 20-25 nm in diameter. They are composed of subunits of the protein tubulin--these subunits are termed alpha and beta. Microtubules act as a scaffold to determine cell shape, and provide a set of "tracks" for cell organelles and vesicles to move on. Microtubules also form the spindle fibers for separating chromosomes during mitosis. When arranged in geometric patterns inside flagella and cilia, they are used for locomotion.

Hope this helps :)

5 0
3 years ago
Explain fragmentation in short but brief
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Answer:

Хннпчщащп8п8п87778а8а7

6 0
2 years ago
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Which central vascular access device (cvad) is placed in arteries, epidural space, and the peritoneal cavity?
harkovskaia [24]

The correct answer to this question would be:

<span> “</span>Implanted venous access ports”

Venous ports are catheter that is placed on the upper chest and may come in either the subclavian or internal jugular vein. They are accessed using Heber needles and they may be flushed after each use or monthly in between courses of treatment.

3 0
3 years ago
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