Protein metabolism and enzymes

What happens when animals die

• Their nitrogen compounds dissipate into the air

• Their nitrogen compounds will return to the soil

• Their nitrogen compounds produce toxic gas

• Their nitrogen compounds combine with oxygen

How animals get the nitrogen they need

• from the air they breathe

• from the water they drink

• from the food they eat

• from the Sun

What is the role of denitrifying bacteria

• change nitrate back into nitrogen gas

• change nitrogen gas into nitrate

• absorb carbon dioxide in the soil

• release oxygen gas into the atmosphere

Tags

NGSS.MS-LS2-3

Which of the following describes the role of nitrogen-fixing bacteria in the nitrogen cycle? Nitrogen-fixing bacteria convert

• nitrates intro nitrogen gas
• ammonia into proteins
• nitrogen gas into ammonia
• proteins into nitrates

What is the role of Michaelis-Menten equation?

• To calculate the free energy

• Mathematically explain the relationship of enzyme's velocity and the substrate concentration

• Mathematically explain the saturation of enzyme in substrate

• To simplify Lineweaver-Burke plot

Select the incorrect statement related to Michaelis-Menten plot (graph)

• At zero concentration of substrate, meaning [S]=0, the velocity is zero

• As the concentration of the substrate increases, the formation of product also increases

• The plot is generated using different concentration of substrate

• The plot is generated using different concentration of enzyme

Choose the incorrect statement on K_m.

• The unit for length is cm. The unit for K_m is substrate concentration

• K_m is the value of [S] when the velocity is half Vmax

• K_m can be obtained directly from Lineweaver-Burke plot

• K_m is a Michaelis-Menten constant

In which type of Inhibition where the inhibitor binds to the same active site of the substrate?

• Uncompetitive

• Non competitive

• Competitive

• All of the above

Which domain of an enzyme is non-protein?

• Active site

• The stabilizing body

• The upper most region

• Co-factor

A catalyst works by

• changing the order of the reaction
• increasing the temperature
• lowering the activation energy
• making the activated complex