Practice MCQ Questions and answers on Biology-GK

The word biology is derived from the greek words "bios" meaning life and "logos" meaning study and is defined as the science of life and living organisms.

Animal cells and plant cells share the common components of a nucleus, cytoplasm, mitochondria and a cell membrane. Plant cells have three extra components, a vacuole, chloroplast and a cell wall.

A eukaryotic cell is a cell which exhibit membrane-bound organelles. They exhibit a well-defined membrane bound nucleus in which the DNA (deoxyribonucleic acid) resides it is the genetic material which is passed on from parents to their offsprings.

According to Huxley the protoplasm is the physical basis of life. Inside the cell wall of living cell the living substance is known as protoplasm. The protoplasm is a thick fluid or jellylike substance.

The enzymatic reactions of cellular respiration begin in the cytoplasm, but most of the reactions occur in the mitochondria. Cellular respiration occurs in the double-membrane organelle called the mitochondrion. The folds in the inner membrane are called cristae.

A prokaryotic cell is a cell which doesn't have an organized cellular structure. The membrane-bounded nucleus is absent and the genetic material is scattered directly in the cytoplasm. The membrane-bounded organelles are absent in a prokaryotic cell e.g., a bacterial cell.

Biology is the science of life. Its name is derived from the Greek words "bios" (life) and "logos" (study).

In bacterial cells, ribosomes are synthesized in the cytoplasm through the transcription of multiple ribosome gene operons. In eukaryotes, the process takes place both in the cell cytoplasm and in the nucleolus, which is a region within the cell nucleus.

Mitochondria are tiny organelles inside cells that are involved in releasing energy from food. This process is known as cellular respiration. It is for this reason that mitochondria are often referred to as the powerhouses of the cell.

The sperm is the smallest cell in human biology, but also one of the most complex.