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Svetllana [295]
3 years ago
13

Name three different freshwater ecosystems. Name two aquatic ecosystems that are not made of solely freshwater and no freshwater

.
Biology
1 answer:
Ivenika [448]3 years ago
7 0
Three different freshwater ecosystems are
-Lotic
-Lentic
-Wetlands

I don’t know the second question...
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Bingel [31]

Answer:

Vesicles.

Explanation:

Transport vesicles are able to move molecules between locations inside the cell. For example, transport vesicles move proteins from the rough endoplasmic reticulum to the Golgi apparatus.

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The majority of the cell membrane is made from _________________________ and has ______________ layers.
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The majority of the cell membrane is made from phospholipids and has 2 layers

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Pepsin is a digestive enzyme. It is made in an inactive form, pepsinogen, which is activated by the acidity of the stomach to se
Paladinen [302]

Answer: Positive feedback loop

Explanation:

Even before the food reaches the stomach (before ingesting it), the glands of the stomach mucosa begin to release its gastric secretion. The main characteristic of this secretion is acidity, as measured by pH (one of the physiological variables).

This acidity is a result of the presence of hydrochloric acid, which is part of the secretion composition. In addition to it, water, pepsinogen (which will give rise to the enzyme pepsin) and the intrinsic factor. The acid has a function of the protection of the entire system by eliminating microorganisms. It is also responsible for the activation of pepsin (which only occurs with acid pH), the enzyme that digests proteins containing the amino acids leucine or phenylalanine or tryptophan or tyrosine.

The concept of Positive feedback loop states that the body tries to increase the value of a variable (acidity, in the case of pepsinogen) when it is below its optimal value (called a point adjustment) and decreases this value when it is above optimal.

5 0
3 years ago
archaeans differ from eukaryotes and bacteria in that Choose one: A. archaeal membranes use ester links to bond glycerol to side
Nady [450]

Answer:

D. archaeal membranes contain L-glycerol.

Explanation:

Archaea and eubacteria differ from each other with respect to the nature of membrane lipids. Lipids present in the membranes of the archaeans have the hydrocarbons derived from isoprene units. These hydrocarbons are branched and are attached to the glycerol with help of ether linkage. Ester linkages are present in eubacteria. The glycerol present in the archaeans is L- glycerol. Bacterial membranes have D-glycerol present in their lipids.

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3 years ago
Short history of climate change
atroni [7]

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A very short history of climate change research. The story of scientists discovering climate change is longer than many of us tend to imagine.

We’ve had a sense that what humans do might effect the climate since Antiquity.

6 0
3 years ago
Read 2 more answers
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