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Dahasolnce [82]
3 years ago
10

What important theory is based on the observations of Hooke and van Leeuwenhoek, documenting the existence of microscopic cells?

Biology
1 answer:
Serhud [2]3 years ago
3 0

The microscopic observations of cells form the basis of the cell theory and the idea that all living things are composed of cells; cells are the structural and functional unit of living things.

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The points of muscle attachment are known as the
Alik [6]

Answer:

Origin and Insertion

Explanation:

The origin is the point of attachment of a muscle that remains relatively fixed during contraction.

The insertion is the point or mode of attachment of a skeletal muscle to the bone or other body part that it moves.

3 0
2 years ago
What are the two different results of a lack of calcium and a lack of atp?
liq [111]
<span>There are numerous proteins in muscle. The main two are thin actin filaments and thick myosin filaments. Thin filaments form a scaffold that thick filaments crawl up. There are many regulatory proteins such as troponin I, troponin C, and tropomyosin. There are also proteins that stabilize the cells and anchor the filaments to other cellular structures. A prime example of this is dystrophin. This protein is thought to stabilize the cell membrane during contraction and prevent it from breaking. Those who lack completely lack dystrophin have a disorder known as Duchene muscular dystrophy. This disease is characterized by muscle wasting begininng in at a young age and usually results in death by the mid 20s. The sarcomere is the repeating unit of skeletal muscle. 

Muscle cells contract by interactions of myosin heads on thick filament with actin monomers on thin filament. The myosin heads bind tightly to actin monomers until ATP binds to the myosin. This causes the release of the myosin head, which subsequently swings foward and associates with an actin monomer further up the thin filament. Hydrolysis and of ATP and the release of ADP and a phosphate allows the mysosin head to pull the thick filament up the thin filament. There are roughly 500 myosin heads on each thick filament and when they repeatedly move up the thin filament, the muscle contracts. There are many regulatory proteins of this contraction. For example, troponin I, troponin C, and tropomyosin form a regulatory switch that blocks myosin heads from binding to actin monomers until a nerve impulse stimulates an influx of calcium. This causes the switch to allow the myosin to bind to the actin and allows the muscle to contract. </span><span>
</span>
6 0
3 years ago
Which parts of the amino acids x and y are involved in the formation of a peptide bond?
NeTakaya

Answer:

Carboxyl group and amino group.

Explanation:

Amino acids have three parts which are the carboxyl group, amino group and the side chain. When forming a peptide bond, the carboxyl group of one amino acid forms bonds with the amino group of the other one to form the peptide bonds between them.

I hope this answer helps.

6 0
3 years ago
Read 2 more answers
HELP!!! 25 Points!!!<br><br> Describe the role of animals in the water and carbon cycles.?
jeka57 [31]

They respire and give off c0^2

6 0
3 years ago
What is the term for changes that occur in most members
Anna71 [15]

Answer:

nonnormative changes

Explanation:

5 0
3 years ago
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