1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
GarryVolchara [31]
3 years ago
15

Why do organisms without oxygen need to convert pyruvate to lactate?

Biology
1 answer:
IrinaK [193]3 years ago
3 0

The question is incomplete. The complete question is:

Question: Why do organisms without oxygen need to convert pyruvate to lactate?

A) because pyruvate is toxic to the cells

B) in order to regenerate NAD+

C) in order to use lactate in the citric acid cycle

D) because lactate is needed to produce ATP

Answer:

B) in order to regenerate NAD+

Explanation:

Kreb's cycle and electron transport chain (ETC) are the aerobic stages of cellular respiration. ETC regenerates NAD+ and FAD+ by oxidation of NADH and FADH2 produced during glycolysis and Kreb's cycle. Here, oxygen serves as the terminal electron acceptor.

Glycolytic reactions use NAD+ as an electron acceptor and produce NADH. Therefore, a constant supply of NAD+ is required to sustain glycolysis. In absence of oxygen, ETC cannot occur and organisms convert pyruvate into lactate. Pyruvate is reduced in lactate and NADH serves as the electron donor. Thereby, lactate fermentation regenerates NAD+ to continue the process of glycolysis.

You might be interested in
What do cells want to being in and what do cells want to keep out
PilotLPTM [1.2K]

Answer:

Cell membranes serve as barriers and gatekeepers. ... Small polar molecules, such as water and ethanol, can also pass through membranes, but they do so more slowly. On the other hand, cell membranes restrict diffusion of highly charged molecules, such as ions, and large molecules, such as sugars and amino acids.

Explanation:

Hope it helps :)

4 0
2 years ago
An experiment uses two groups of mice with 20 individuals in each group. Both groups are fed the same amount of water and food e
Anna007 [38]

Answer:

constants.

Explanation:

Climate-controlled room are almost indoor and are kept with stable temperatures and also with stable humidity levels.

<u>In biological experiments, it used to establish constant parameters like temperature, humidity, exposure to different things, growth of organisms and etc.</u>

These rooms provide better shelf life and thus better results.

6 0
3 years ago
Which of the following is not true about cells? 1)All living thing begins life as a single cell. 2)The cell is the basic unit of
icang [17]
The one that is true about cells is Number two. The cell is the basic unit of a structure and function of life. The cells are what makes us living things. All living things are made up of cells.
5 0
3 years ago
If the Earth is 4.6 billion years old. However, the oldest sea floor is only bout 180 million years old. What do you think is th
Vera_Pavlovna [14]

Answer:

I think when the earth was created it took a time. Then dinosaurs came. Then tey extinct because falling of asteroid on Earth.Then after a period of time the sea,mountains and other natural things were made again.

6 0
2 years ago
Read 2 more answers
Heidi is doing a sit-up for P.E. class. Which of the following muscles is she using?
allochka39001 [22]

Answer:

d. All of the above

Explanation: is correct

4 0
2 years ago
Other questions:
  • The average, year after year conditions of temperature, precipitation, winds, and cloud in an area are known as its
    15·1 answer
  • Help me fast this is do I. like 3 hours
    14·1 answer
  • Data was collected concerning Galapagos bird beak size over time. There are several species finches, and they are also known as
    7·2 answers
  • Which drug would be used to treat a client with severe motor tics, barking cries, and outbursts of obscene language?
    12·2 answers
  • The membrane potential in which there is no net movement of the ion across the membrane is called the _____.
    10·1 answer
  • Which best describes the first organisms on earth?
    13·1 answer
  • Most of the Blackland Prairie ecoregion of Texas has been converted to farmland and ranches. Between crop harvests, some farmers
    8·2 answers
  • Depending on the organism the number of in a cell may change
    5·1 answer
  • Does the stomach only does chemical digestion to break down food?
    10·1 answer
  • Which statements about what happens in glyclosis are true? select all the apply.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!