QCM : Fundamentals of Biological and Physical Science — 9 questions

Explication

The scientific method provides a systematic approach to investigating biological phenomena through observation, hypothesis formulation, experimentation, analysis, and conclusion. It ensures that findings are based on evidence and reproducible results.

Explication

Hydrogen bonds are weak attractions that play a crucial role in stabilizing the double helix structure of DNA and the secondary structures of proteins, making this the correct answer.

Explication

Ionic bonds form when electrons are transferred from one atom to another, typically between metals and nonmetals, resulting in charged ions that attract each other. Covalent bonds involve sharing electrons, while hydrogen bonds are attractions between polar molecules.

Explication

The mole (mol) is the SI unit for measuring the amount of substance, representing a specific number of particles, typically molecules or atoms.

Explication

Water's high specific heat (4.18 J/g°C) means it can absorb or release large amounts of heat with little temperature change. This property helps organisms maintain stable internal temperatures and buffers against environmental temperature fluctuations.

Explication

Isotopes differ in the number of neutrons, which affects their atomic mass but not their chemical properties, as they have the same number of protons.

Explication

John Dalton is credited with developing the atomic theory in the early 1800s, describing atoms as indivisible particles, making this the correct answer.

Explication

Covalent bonds involve the sharing of electrons between atoms, which can be polar or nonpolar, facilitating the formation of complex molecules.

Explication

Water's high specific heat capacity allows it to absorb and release heat slowly, buffering temperature changes in organisms and environments.