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Arisa [49]
3 years ago
10

What type of lipids are found in the 2 layers of the cell membrane of cells?

Biology
1 answer:
Marianna [84]3 years ago
6 0
The inside layer<span> is made of hydrophobic fatty acid ( water hater ), while the outer </span>layer<span> is made up of hydrophilic polar heads (water lover). </span>
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What is the original source of variation that natural selection can act upon?
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Answer:  "mutations" .
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Does carbohydrate hydrolysis by ptyalin continue in the stomach
Akimi4 [234]

<span>Ptyalin hydrolysis does not continue in the stomach because it is destroyed by the stomach once it enter the stomach. </span>

Ptyalin is an amylase enzyme commonly found in the saliva of humans and animals. This enzyme is secreted in the mouth ( buccal cavity) and catalyze the hydrolysis of starch into maltose and dextrin. Immediately the starch leaves the mouth and enter the stomach, stomach acids destroy the ptyalin.

7 0
3 years ago
Adaptive immunity comprises two branches: humoral immunity and cellular immunity. What are the characteristics of each of the tw
kotegsom [21]

Answer:

Adaptive or acquired immunity is that we acquire throughout our lives through vaccines (active), breast milk (passive) or injection of specific artificial or natural antibodies to a certain pathogen (passive).

The two great arms of this immunity are the humoral and the cellular.

The humoral refers to the cytokines and immunomodulatory molecules that are responsible for transmitting fundamental messages between defense cells in order to coordinate the destruction of the pathogen between them.

Instead, cellular immunity speaks about cell lineage such as b, t, tcd4 lymphocytes, natural killers, plasmacytes, etc.

It can be said that the humoral factor is the one that coordinates the pathways and the relationships between the cells of the acquired immunity, both are important because the two need each other for adaptive immunity to work.

Explanation:

Examples of the humoral factor: pro and anti inflammatory cytokines, interleukins, complement chain, antibodies, TNF alpha, beta, etc.

Examples of cellular factor: plasmacyst, b lymphocyte, t lymphocyte, NT lymphocyte

6 0
3 years ago
Why is primary production and animal life concentrated at the surface in pelagic regions of the open-ocean?
konstantin123 [22]
Photosynthesising primary producers require sunlight. Therefore, in the ocean, phytoplankton would be concentrated within the surface layers of the ocean where the sunlight penetrates. Phytoplankton support a wide range of marine life: zooplankton feed on phytoplankton, which in turn support fish and so on. 
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