The element that is a component of hemoglobin is: MCQ with Answer and Explanation

Explanation:
Electron microscopes use beams of electrons to achieve much higher resolution than light microscopes, enabling visualization of organelles and macromolecular complexes. Types include TEM (internal) and SEM (surface). Light microscopes use visible light, spectrophotometry measures absorbance, chromatography separates.

Explanation:
The cell membrane (plasma membrane) is selectively permeable, meaning it allows certain substances to pass through while restricting others, maintaining cellular homeostasis. The nucleus is the control center of the eukaryotic cell, housing the DNA and directing cellular activities like growth, metabolism, and reproduction. The cell wall is a rigid outer layer present in plant cells, fungi, and bacteria, but it is completely absent in animal cells, which only have a flexible cell membrane. Thus, statements 1 and 3 are correct.

Explanation:
Asexual reproduction (binary fission, budding, fragmentation, vegetative propagation) produces genetically identical offspring from a single parent. Sexual reproduction involves gamete fusion. Fertilization is gamete union.