Question

a)For mammals, some amino acids are essential in the diet, whereas others may be formed from dietary components. Humans are capable of converting:aspartic acid into isoleucine. True/False?

b)For mammals, some amino acids are essential in the diet, whereas others may be formed from dietary components. Humans are capable of converting:pyruvate to alanine. True/False?

c)Nitrogen fixation (conversion of N2 to NH4+):requires the participation of CO2.True/False?

d) Nitrogen fixation (conversion of N2 to NH4+):requires a powerful reductant. True/False?

e)Nitrogen fixation (conversion of N2 to NH4+):requires at least 12 ATP per N2 fixed. True/False?

f)Nitrogen fixation (conversion of N2 to NH4+):requires the nitrogenase complex.True/False?

g) Nitrogen fixation (conversion of N2 to NH4+):occurs in all plants.True/False?

Answer 1

1.True

2.True

The Cahill cycle, also known as the alanine cycleor glucose-alanine cycle, is the series of reactions in which amino groups and carbons from muscle are transported to the liver. It is quite similar to the Cori cycle in the cycling of nutrients between skeletal muscle and the liver. When muscles degrade amino acids for energy needs, the resulting nitrogen is transaminated to pyruvate to form alanine. This is performed by the enzyme alanine transaminase(ALT), which converts L-glutamate and pyruvate into α-ketoglutarate and L-alanine

3.False

The nitrogen cycle is a repeating cycle of processes during which nitrogen moves through both living and non-living things: the atmosphere, soil, water, plants, animals and bacteria. In order to move through the different parts of the cycle, nitrogen must change forms. In the atmosphere, nitrogen exists as a gas (N2), but in the soils it exists as nitrogen oxide, NO, and nitrogen dioxide, NO2, and when used as a fertilizer, can be found in other forms, such as ammonia, NH3, which can be processed even further into a different fertilizer, ammonium nitrate, or NH4NO3.

There are five stages in the nitrogen cycle, and we will now discuss each of them in turn: fixation or volatilization, mineralization, nitrification, immobilization, and denitrification. In this image, microbes in the soil turn nitrogen gas (N2) into what is called volatile ammonia (NH3), so the fixation process is called volatilization.Leaching is where certain forms of nitrogen (such as nitrate, or NO3) becomes dissolved in water and leaks out of the soil, potentially polluting waterways.

4.True

Microorganisms Use ATP and a Powerful Reductant to Reduce Atmospheric Nitrogen to Ammonia

5.false

It requires at least 16 ATP

6.True

Nitrogenase complex is a multi-subunit complex of two proteins .

7.false

Nitrogen fixation is a process by which molecular nitrogen in the air is converted into ammonia(NH3) or related nitrogenous compounds in soil