Biochemistry Practice Test 8

1. Why light is required for light dependent reactions?

It energizes electrons in the reaction center

It splits the water molecules

It is the source for electrons

It splits ATP molecules which generates the energy necessary to power the light independent reactions

2. Which one of the following is true about C₄ plants?

They minimize the rubisco oxygenase activity by fixing CO₂ into phosphoenolpyruvic acid

They mainly occur in areas of high temperature and light intensity

They minimize rubisco oxygenase activity by fixing CO₂ into oxaloacetate

C₃ plants are more efficient in photosynthesis than C₄ plants

3. Which of the following class of drugs reduce the levels of fatty acids circulating in the blood?

Amphetamines

Cathinones

Synthetic cannabinoids

Thiazolidinediones

4. Programmed cell death can be termed as ____________

Apoptosis

Cell cycle

Cell division

Oxidative stress

5. Which of the following catalyzes reactions that incorporate nitrogen derived from glutamine?

Glutamine synthase

Adenylyltransferase

Glutamine amidotransferase

Glutamate synthase

6. In animal tissues, triacylglycerols and glycerophospholipids share two precursors ___________

Fatty acyl co-A and L-glycerol 3-phosphate

L-glycerol 3-phosphate and L-glycerol 2-phosphate

Diacylglycerol 3-phosphate and L-glycerol 3-phosphate

L-glycerol 3-phosphate and diacylglycerol 2-phosphate

7. The carbon-assimilation reactions require ATP and NADPH in the ratio ___________

3:2

2:3

3:4

4:3

8. Cerebroside is also called as ___________

Gangliosides

Sphingomyelin

Sphinganine

N-acylsphingosine

9. The essential intermediates in the pathway from acetate to cholesterol are ___________

Methane

Ethylene

Isoprene units

Acetic acid

10. Formation of organic nitrogen compounds like amino acids from inorganic nitrogen compounds is called as ____________

Denitrification

Nitrogen fixation

Nitrification

Nitrogen assimilation