Biology MCQs
Topic Notes: Biology
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
91
Which element serves as the fundamental building block for the diverse array of biological molecules found in living organisms?
Answer:
carbon atom
Carbon is the central element of organic chemistry and biology. Due to its unique ability to form four stable covalent bonds with other atoms, including other carbon atoms, it serves as the structural backbone for complex molecules such as carbohydrates, lipids, proteins, and nucleic acids.
92
How many naturally occurring chemical elements are typically involved in biochemical reactions within living organisms?
Answer:
92
There are 92 naturally occurring elements found on Earth. While living organisms utilize a subset of these for biological processes, the total number of naturally occurring elements is widely accepted as 92. These elements form the basis of all biological molecules, including proteins, nucleic acids, and carbohydrates.
93
Which B-complex vitamin is commonly referred to as vitamin H?
Answer:
B7
Vitamin H is the historical name for biotin, which is also known as vitamin B7. It plays a crucial role in metabolism, particularly in the synthesis of fatty acids and glucose.