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
Scrat [10]
3 years ago
13

In the Cori cycle, when glucose is degraded by glycolysis to lactate in muscle, the lactate is excreted into the blood and retur

ns to the liver. In the liver, lactate is converted back into glucose by gluconeogenesis. For each given enzyme, identify whether it is involved in the glycolysis pathyway, gluconeogenesis pathway, both pathways, or neither pathway.
a. glyceraldehyde 3-phosphate dehydrogenase
b. phosphofructokinase-1
c. phosphoenolpyruvate carboxykinase
d. alcohol dehydrogenase
Biology
1 answer:
saveliy_v [14]3 years ago
5 0

Answer and explanation:

Glycolysis and gluconeogenesis are metabolic pathways of great importance in the regulation of glycemia (glucose levels in the blood).

While glycolysis, a catabolic pathway that occurs when the glucose levels are high and is used to generate energy inside our cells; gluconeogenesis, an anabolic pathway, happens because glucose levels aren't high enough for our tissues to perform their energy-demanding tasks.

Glycolysis is stimulated by <u>insulin</u> and transforms 1 glucose molecule into 2 pyruvate molecules, which can then be further metabolized to produce ATP. Gluconeogenesis does the opposite: being stimulated by <u>glucagon and epinephrine</u>, it converts pyruvate molecules into glucose molecules to elevate glycemia.

Partaking in antagonizing pathways, glycolysis and gluconeogenesis appear to be the exact reverse pathway for one another, except for a few specific enzymes that are unique to each one of them.

a. glyceraldehyde 3-phosphate dehydrogenase - both pathways. This enzyme catalyzes the conversion of glyceraldehyde 3-phosphate into 1, 2 biphosphoglycerate, and backward.

b. phosphofructokinase-1 - glycolysis. This kinase phosphorylates (adds a phosphate group) fructose 6-phosphate into fructose 1, 6 biphosphate. In gluconeogenesis, the opposite reaction occurs thanks to the fructose 1, 6 biphosphatase (which removes a phosphate group from fructose 1, 6 biphosphate).

c. phosphoenolpyruvate (PEP) carboxykinase - gluconeogenesis. In glycolysis, phosphoenolpyruvate is transformed to pyruvate in one single reaction, catalyzed by enzyme pyruvate kinase. But in gluconeogenesis, pyruvate needs first to be converted into oxalacetate by the pyruvate carboxylase, so can then be transformed into phosphoenolpyruvate by the PEP carboxykinase.

d. alcohol dehydrogenase - neither pathway. Alcohol dehydrogenase is an enzyme that can be found in Ethanol metabolism, catalyzing the forming of acetaldehyde from an ethanol molecule.

You might be interested in
There is a type of algae that lives in the cells of corals. These algae process carbon through photosynthesis and pass it on to
VARVARA [1.3K]

These algae process carbon through photosynthesis and pass it on to corals in the form of glucose, a sugar that provides the energy corals need

6 0
3 years ago
Read 2 more answers
Neanderthals differed from modern humans in: A. long (front-to-back), vertically low skull shape B. having smaller brain size th
MrRa [10]

Answer:

A. long (front-to-back), vertically low skull shape

Explanation:

  • The Neanderthals had a different body structure than doe the present modern humans have. The had a more robust well-built structure and had a distinctive morphological feature.  
  • Research suggests they were stronger than modern man thought they were slightly shorter than modern humans. They had a noticeable face, a chin, and a forehead slope.
4 0
2 years ago
Sweating and panting are examples of which characteristics of life?
Keith_Richards [23]
Well it would be an example of homeostasis. As it's trying to control and reestablish your body back to normal. <span />
3 0
3 years ago
If polar is positive and non-polar is negative then why can’t a polar molecule pass through the non-polar phospholipid membrane
Ierofanga [76]

Answer:

Because of the chemical and structural nature of the phospholipid lipid by layer the lipid soluble molecule can just pass the lipid membrane and some small molecules can also pass freely.

Explanation:

as we know that the homeostasis is an important process for a  living cell to maintain it self so for the the exchange of materials between the external and internal environment is must so for that it exchange material with the outside environment of the cell.as the cell membrane is semipermeable(mean allow some molecule to pass(lipid soluble) and not others(lipid non soluble) to pass through the membrane.the cell membrane is selectively permeable due to its nature and chemical composition the chemical composition is lipid and  phosphate and glycerol(head) with fatty acid that may b saturated or unsaturated(tail).so finally all those molecule which are polar can not pass through the membrane and  non polar can pass the membrane.The size of the molecule is also a factor on which the permeability depends.

3 0
2 years ago
4) Name the type of symbiotic relationship in which the host is harmed. Give two examples.
Marina86 [1]
Symbiosis is a close relationship between two species in which at least one species benefits. For the other species, the relationship may be positive, negative, or neutral. There are three basic types of symbiosis: mutualism, commensalism, and parasitism.

Mutualism

Mutualism is a symbiotic relationship in which both species benefit. An example of mutualism involves goby fish and shrimp
7 0
2 years ago
Other questions:
  • Which family members have red-green color blindness? Sam, Tim, Bella, and Joshua Lisa and Monica Ben, Jenny, Mike, Carol, Katie,
    5·2 answers
  • A client asks the nurse about the use of an intrauterine device (iud) for contraception. which information should the nurse incl
    10·1 answer
  • Why do phospholipids form a bilayer in water?
    14·1 answer
  • Carbohydrate: what elements do you expect to find in a carbohydrate?
    14·1 answer
  • Which "spheres" are involved when sedimentary rocks are weathered by wind and waves on the ocean coasts?
    11·2 answers
  • Different versions of a federal bill have successfully passed both in the House and the Senate. Which is the next step in the la
    8·2 answers
  • The cell membrane, cytoplasm, and nucleus are collectively called the
    9·2 answers
  • Explain the interdependence of photosynthesis and cellular respiration. Discuss the effect on organisms that perform cellular re
    5·2 answers
  • How can the freezing of surface waters make the water that is left unfrozen denser
    6·2 answers
  • What do a sunflower and a lion living 50 years ago have in common
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!