Specifically in which organelle does photosynthesis take place

On the Galápagos Islands, Darwin observed tortoises with domed and saddle-shaped shells. How did Darwin’s observations of these

Archy [21]

Helped to confirm that environmental changes cannot affect the characteristics of a species.

4 0

3 years ago

In the lab, metabolic poisons can be used to study ATP synthesis and oxygen consumption. Many of these poisons have – or have ha

ivanzaharov [21]

Answer:

Electron transport inhibitors: Cyanide, Rotenone

Uncoupling agents: trifluorocarbonylcyanide phenylhydrazone (FCCP)(FCCP)

ATP synthase inhibitors: Oligomycin

Transport inhibitors: Bongkrekic acid

Explanation:

Electron transport inhibitors: Cyanide, Rotenone

Cytochrome oxidase also known as complex IV in the electron transport chain, carries electrons from cytochrome c to oxygen. It is a large enzyme having 13 subunits. Subunit 1 contains two heme groups , a and a3. Electrons are tranferred from heme a to oxygen bound to heme a3. The reaction of cyanide with heme a3 blocks this process of eleron transport

.Rotenone blocks electron transfer at NADH dehydrogenase (NAD−Q(NAD−Q oxidoreductase) by preventing electron transfer from Fe-S center to ubiquinone.

Uncoupling agents: trifluorocarbonylcyanide phenylhydrazone (FCCP)(FCCP)

The transfer of electrons from NADH through the respiratory chain to molecularoxygen is coupled to proton pumping from the inner mitochondrial matrix to the intermembrane space. This generates a proton motive force which is utilized in ATP synthesis. Trifluorocarbonylcyanide phenylhydrazone (FCCP)(FCCP) increases membrane proton permeability, causing protons to leak back into the mitochondrial matrix, thereby uncoupling the processs of ATP synthesis and proton flux.

ATP synthase inhibitors: Oligomycin

ATP synthase is the enzyme rensponsible for ATP synthesis. It has two functional domains,: F₁ and F₀. Oligomycin binds to F₀ and blocks the proton channel preventing rotation of the F₁ subuni, thus, preventing ATP synthesis from ADP.

Transport inhibitors: Bongkrekic acid

Adenine nucleotide translocase is a transport protein that transports free ADP from the cytoplasm into the mitochondrial matrix, while ATP produced from oxidative phosphorylation is transported from the mitochondrial matrix to the cytoplasm o the cell.

Bongkrekic acid inhibits Adenine nucleotide translocase, thus preventing ATP from leaving the mitochondria and starving cells of needed energy.

5 0

3 years ago

How is oxygen carried from the lungs to the tissues?

Pepsi [2]

Answer:

continuous supply of oxygen to the cells. oxygen is extracted from the atmospheric air in the lungs, and carried by the bloodstream through the circulation to the tissue

7 0

2 years ago

Read 2 more answers

How many significant figures are in the measurement of 0.020 km?

natali 33 [55]

Answer: Option b) 2

Explanation:

Significant figures are the digits which play a role in defining a measurement that is they carry some meaning.

There are three essential rules to find out the significant figures in a given number:

Rule 1: Non-zero digits such are always significant.
Rule 2: The zeroes after a non-zero number in decimal are also significant. An example is if the number is 0.0500 then the zeroes after 5 are considered significant, however, the zeroes before 5 are not significant.
Rule 3: The zeroes placed between any two significant digits are also considered as significant e.g in 202 the zero is significant.
Therefore, in the number 0.020 km, there are two significant digits, one is 2 and the other is the last zero placed after 2.

4 0

4 years ago

Read 2 more answers

The _______ is a ring of tissue surrounding and partially covering the vaginal opening.

PtichkaEL [24]

The answer is hymen. Hope this helps. If you have any other questions you need help with, feel free to message me. :)

5 0

3 years ago