Practice MCQ Questions and answers on Biology-GK

A reflex arc is a neural pathway that controls a reflex. In vertebrates, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord. This allows for faster reflex actions to occur by activating spinal motor neurons without the delay of routing signals through the brain.

Spiders are arachnids. So are scorpions, mites, and ticks. Arachnids are classified primarily by having eight legs and two distinct body regions, the cephalothorax (which is a fusion of the head and thorax), and the abdomen.

In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll. Chloroplasts are surrounded by a double membrane and contain a third inner membrane, called the thylakoid membrane, that forms long folds within the organelle.

Cytoplasm consists of an aqueous ground substance, the cytosol, containing a variety of cell organelles and other inclusions such as insoluble waste and storage products (starch, glycogen, lipid, etc.)

Molecular biology is the branch of biology that deals with the study of the structures of organisms, their cells, and their organelles at the molecular level.

It focuses on understanding the interactions between various systems of a cell, including the interactions between DNA, RNA, and protein synthesis.

This field combines aspects of genetics, biochemistry, and cell biology to explain how biological molecules give rise to the processes that occur within living cells.

Therefore, the correct term for this study is Molecular biology.

In plants and algae, which developed much later, photosynthesis occurs in a specialized intracellular organelle - the chloroplast.

Photosynthesis take place in chloroplast.

DNA is a heredity material and contains the genetic information which is passed on from one generation to another.

The genetic information of an organism is stored in DNA molecules.

Protein synthesis takes place in ribosomes of a cell.