The correct answer is (d) (i) and (ii). Ribosomes are responsible for protein synthesis and help in the manufacture of enzymes (which are proteins). However, they do not manufacture starch grains (carbohydrates) or hormones (some of which are proteins but ...

The correct answer is (d)(i), (ii) and (iv). Dalton’s atomic theory successfully explained: Law of Conservation of Mass(i) – Atoms are neither created nor destroyed in a chemical reaction. Law of Constant Composition(ii) – A compound always contains the same ...

The correct answer is (b) 2,8,2. Magnesium (Mg) has an atomic number of 12, meaning it has 12 electrons. The electronic distribution follows the 2,8,2 pattern according to the Bohr model, where the first shell holds 2 electrons, the second ...

The correct answer is (c) different neutrons. Isotopes of an element have the same number of protons and electrons but different numbers of neutrons. This results in the same chemical properties but slightly different physical properties, such as mass and ...

The correct answer is (a) An atom has an equal number of electrons and protons. Atoms are electrically neutral, meaning the number of protons (positively charged) always equals the number of electrons (negatively charged). However, the number of neutrons may ...