Questions

The two DNA strands are called polynucleotidesbecause they are composed of simpler monomer units called nucleotides. Eachnucleotideis composed of one of four nitrogen-containingnucleobases (cytosine, guanine, adenine or thymine), a sugar called deoxyribose, and a phosphate group.

Fixed cost per unit increases when production volume decreases. The fixed cost per unit does not always remain the same. Fixed cost per unit increases when production volume decreases and vice versa.

World Soil Day 2017 is celebrated on 5 December under the theme "Caring for the Planet starts from the Ground," with activities aiming to communicate messages on the importance of soil quality for food security, healthy ecosystems and human well-being.Soils not only produce 95% of the food we consume, they also have a huge potential for taking carbon from the atmosphere and offsetting the greenhouse gas emissions. Keeping the soil healthy can bring a multitude of gains, from food security to sustainable livelihoods and climate benefits.