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Mariana [72]
3 years ago
5

The immune system is a network of cells, tissues, and organs that help

Biology
1 answer:
Ronch [10]3 years ago
8 0

protect the human body.

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4. Which of the following is NOT part of the cell theory?
Rudiy27

All cells must develop from other cells of the following is NOT part of the cell theory.

The correct option is D.

<h3>What is a cell?</h3>

The fundamental units of all living organisms are cells. There are many billions of cells in a human body. They give the body structure, absorb nutrients from meals, turn those into energy, and perform certain tasks.

<h3>What is the cell's structure?</h3>

The cellular membranes, the nucleus, and the cytoplasm are the three components that make up a cell. Intricate arrangements of microscopic fibers and tens of thousands of tiny, unique structures known as organelles can be found in the cytoplasm.

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7 0
1 year ago
What are two types of molecules made in the smooth endoplasmic reticulum
Vadim26 [7]

Answer:

The two types of molecules synthesized by smooth endoplasmic reticulum is phospholipid molecules of plasma membrane and steroid hormone.

Explanation:

Endoplasmic reticulum is one of the most important organelle found inside the cytoplasm of eukaryotic cell.Endoplasmic reticulam is of two types

1 Rough endoplasmic reticulum contain ribosome on its surface which is responsible for the roughness of this endoplasmic retuculum.Rough endoplasmic retuculm help in protein synthesis.

2  Smooth endoplasmic reticulum does not contain ribosomes in its structure.Smooth endoplasmic reticulum is found in large amount in the testis ans ovaries of human.

     Smooth endoplasmic reticulum play a significant role in the biosynthesis of phos pholipid of plasma membrane along with the production of various steroid hormones such as testosterone.

5 0
3 years ago
What is the signal that the protein<br> chain is<br> complete?
FrozenT [24]
The end of the protein-coding message is signaled by the presence of one of three codons (UAA, UAG, or UGA) called stop codons (see Figure 6-50). These are not recognized by a tRNA and do not specify an amino acid, but instead signal to the ribosome to stop translation.
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2 years ago
Why do scientists consider pikaia to be an early chordate and not a worm​
GalinKa [24]

Answer:

Notochord (flexible supporting rod structure only found in chordates)

Explanation:

Mark Me Brainliest Pls

3 0
4 years ago
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What is true of a physical change
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A physical change occur when objects or substances undergo a change that does not change in which the composition of a substance changes or one or more substances combine or break up from new substances.
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3 years ago
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