Lipids are diverse compounds that are grouped together because they are

A fossil bone has 25% of this new radioactive element remaining. If the half-life of this new element is 10,000 years, how old i

natali 33 [55]

The element starts off as 100%. half of 100% is 50% and half of 50% is 25%. the element has emitted 2 times the half life which is 10,000 x 2 = 20,000

the fossil bone is 20,000 years old

4 0

3 years ago

Which is the correct sequence of events in mitosis?

goblinko [34]

Prophase, Metaphase, Anaphase, Telophase

6 0

3 years ago

What kind of plants are likely to be pioneers species?

vova2212 [387]

Because pioneer species are the first to return after a disturbance, they are the first stage of succession, and their presence increases the diversity in a region. They are usually a hardy plant, algae or moss that can withstand a hostile environment.

8 0

3 years ago

Which of the following is considered assimilation in the carbon cycle?

kicyunya [14]

Answer: C. A plant absorbing carbon dioxide during photosynthesis

A plant absorbing carbon dioxide during photosynthesis can be considered as assimilation in the carbon cycle. 

Explanation:

The process of carbon fixation is called assimilation in carbon cycle. In the atmosphere carbon occurs in the form of carbon dioxide. 

By the process of carbon fixation this carbon dioxide is converted into carbon compounds and these act as source of energy in an ecosystem.

Photosynthesis is an example of carbon fixation process. Other processes like chemo-synthesis also fix carbon. Majority of carbon fixation takes place in marine environments. 

7 0

4 years ago

The ATP yield for a molecule depends on where it enters glycolysis or the citric acid cycle. The yield can be compared to the ne

Andru [333]

Answer:

a) The net ATP yield from fructose 1,6‑bisphosphate is 32 ATP

b) The net ATP yield from galactose is 30 ATP

c) The net ATP yield from dihydroxyacetone phosphate is 16 ATP

d) The net ATP yield from pyruvate is 12.5 ATP

e) The net ATP yield from lactate is 14 ATP

f) The net ATP yield from phosphoenolpyruvate is 13.5 ATP

Explanation:

a) In this case, 2 ATP molecules are not used for the phosphorylation of glucose for the production of fructose bisphosphate 1.6, thus, the net ATP yield is 32 ATP.

b) Galactose is converted to glucose-1-phosphate through reactions that lead to phosphorylation. Glucose-1-phosphate is transformed into glucose-6-phosphate by the enzyme phosphoglucomutase. Later it is used in glycolysis, thus, the net ATP yield is 30 ATP.

c) The fructose 1,6 bisphosphate is decomposed in glyceraldehyde-3-phosphate and dihydroxyacetone phosphate. Dihydroxyacetone phosphate is isomerized to glyceraldehyde -3-phosphate. ATP performance is (2.5+2.5+11) = 16 ATP

d) Pyruvate is decarboxylated oxidatively to produce acetyl-CoA. ATP yields are:

Glycolysis = 0

Oxidative decarboxylation = 2.5 ATP

TCA cycle = 10 ATP

The net yield is 2.5 + 10 = 12.5 ATP

e) Lactate is oxidized to pyruvate by the enzyme lactate dehydrogenase with a reduction of NAD. Pyruvate is brought into the mitochondria, where it is decarboxylated oxidatively to produce acetyl-CoA. If 1.5 ATP is assumed for cytosolic NADH, therefore 1.5 is produced. So, the net yield is: 12.5 + 1.5 = 14

f) Phosphoenolpyruvate is converted to pyruvate by ATP production through phosphorylation. ATP yield is as follows:

Glycolysis = 1

Oxidative decarboxylation = 2.5 ATP

TCA cycle = 10 ATP

The net yield is 1 + 2.5 + 10 = 13.5 ATP

6 0

3 years ago