When was mitochondria developed

1 answer:

6 0

This symbiotic relationship probably developed 1.7 to 2 billion years ago. A few groups of unicellular eukaryotes have only vestigial mitochondria or derived structures: the microsporidians, metamonads, and archamoebae.

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I open and close so, that things can go in and out. Which organelle do I closely represent. Cell membrane, cell wall, chloropla

slava [35]

Cell Membrane because it transport nutrients into the cells and also transport toxic substances out of the cell .

8 0

3 years ago

In the “energizing stage” of the sliding filament theory of muscle contraction, ATP breaks down and releases energy to cause the

IgorC [24]

Calcium ions presents Ca+ binds to troponin which makes tropomyosin move out of way for myosin to attach. Cross-bridge attaches. ATP breakdown provides energy to ready the myosin head for a power stroke. Myosin head attaches to exposed binding site on actin and the power stroke is accomplished. Cross-bridge (Myosin head) springs from raised position and pulls on the actin filament. Cross bridges break, ATP binds to Cross-bridge (but is not yet broken down) Myosin heads are released from actin. As long as calcium ions and ATP are present, this walking continues until the musle fiber is fully contracted. Hope this helps!

5 0

3 years ago

Which model holds true to explain the synthesis of atp by energy released from electron transport chain?

LenaWriter [7]

Chemiosmotic coupling holds true to explain the synthesis of atp by energy released from electron transport chain.

Peter Mitchell suggested that it would be possible to produce ATP by using an electrochemical gradient of protons across a membrane. The process is known as chemiosmosis because he compared it to osmosis, which is the diffusion of water across a membrane. Only a membrane protein known as ATP synthase allows hydrogen ions in the matrix space to pass through the inner mitochondrial membrane.

ADP is converted into ATP by ATP synthase as protons pass through. Oxidative phosphorylation describes the process by which ATP is produced in mitochondria by chemiosmosis. Proton gradient, ATP synthase, and proton pump are the essential elements required for the chemiosmosis process.

Learn more about ATP here:

brainly.com/question/174043

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6 0

2 years ago

This macromolecule forms pumps and channels within the cell membrane. They act like to let molecules in and out of the cell.

Ilya [14]

Answer:

The macromolecules that forms pumps and channels in the cell membrane, allowing the entry and exit of molecules to the cell are protein.

Explanation:

Membrane integral proteins are a type of macromolecule attached to the structure of the membrane and have ends in contact with the cytoplasm and the extracellular medium.

These protein molecules can act as channels and transporters or pumps, to facilitate the passage of substances through the membrane. An example of transmembrane channels are ion channels, while a protein transporter is the sodium potassium ATP-ase pump.

Membrane proteins can also act as surface receptors and enzymes linked to the cell membrane.

The other options are not correct because :

Carbohydrates can be found on the membrane bound to other molecules, such as glycoproteins and glycolipids, but they do not act as pumps or channels.
Lipids have the function of being the main component of the cell membranes.
Nucleic acids are found in the nucleus, and are not part of the cell membrane.

3 0

3 years ago

Match the kingdom with the correct classification scheme.

Kruka [31]

[A] Eukaryotic, multicellular, heterotrophic organisms----Animalia

[B] Prokaryotic, unicellular, autotrophic &/or heterotrophic, harsh enviroment, no peptidoglycan----Archaebacteria

[C] Prokaryotic, unicellular, autotrophic &/or heterotrophic, with peptidoglycan and lives everywhere----Eubacteria

[D] Eukaryotic, unicellular or multicellular, heterotrophic---Fungi

[E] Eukaryotic, multicellular, autotrophic organisms----Plantae

[F] Eukaryotic, unicellular or multicellular, autotrophic or heterotrophic organisms lacking tissue specialization----Protista

6 0

3 years ago