13.

Why do biologists believe glycolysis evolved before the krebs cycle and the electron transport chain?

ollegr [7]

Answer:

Glycolysis evolved before Kreb's cycle and Electron Transport chain. This view is supported by following facts:

Glucose cannot enter the mitochondria and it needs to be broken down into pyruvate in the cytosol by the process of glycolysis.
Pyruvate then forms acetyl CoA that enters the mitochondria where it undergoes Kreb's cycle.

The Electron transport Chain occurs by passing of electron and finally donating it to the electron acceptor oxygen. The molecules of NADH produced in the preparatory phase of glycolysis provides the electron for electron transport chain.

Thus Glycolysis must have evolved before Kreb's Cycle and Electron Transport Chain otherwise the raw materials for both the processes would not have been available.

4 0

3 years ago

Which is an example of a plant with true roots? A) algae B) ferns C) liverworts D) moss

fredd [130]

Answer: B) ferns

Algae, liverworts and moss are examples of plants with no real stems, leaves or roots and are also known as nonvascular plants. Plants with true roots are known as vascular plants. Vascular plants have real roots, stems and leaves and contain vascular tissues.

5 0

3 years ago

Kelley used to do three sets of squats one time per week. after three weeks she noticed she was less sore than when she started

Lemur [1.5K]

The principle underlying this change is called progression. This principle tells us that when your fitness level improves, your body has adjusted to your regular routine; thus, you will feel less sore than when you started the squats three weeks ago. During this time, your muscles have developed and your body has adopted to the stress brought about by your exercise.

3 0

3 years ago

Which process occurs only in autotrophic organisms? Calvin cycle chemiosmosis Krebs cycle proton pump mechanism

tankabanditka [31]

The answer to this question should be: Calvin cycle

Calvin cycle is a chemical reaction that was done in the chloroplast of a plant. This is one of the reactions in photosynthesis. In Calvin cycle, carbon dioxide and water will be used to make carbohydrates(glucose). This reaction is forming energy using the sunlight so only autotrophic organism capable that will be able to do it.

7 0

3 years ago

Find the slope between (0,-7) and (7,0). Reduce it. show work

lana66690 [7]

Answer:

$\displaystyle m=1$