Consider the following statements about enzymes: 1. They are biological catalysts. 2. They are consumed in the reaction. 3. They lower the activation energy of reactions. Which of the above is/are correct? MCQ with Answer and Explanation

Explanation:
Lysosomes contain about 40 types of hydrolytic enzymes (hydrolases) like proteases, lipases, nucleases, glycosidases, which digest macromolecules. They function in acidic pH (5.0). Oxidoreductases catalyze oxidation-reduction, transferases transfer groups, isomerases catalyze isomerization. Lysosomes are involved in autophagy, phagocytosis, and programmed cell death. Their rupture leads to autolysis, hence called 'suicide bags'.

Explanation:
The uterus (womb) is a muscular organ where the fertilized egg implants in the thickened endometrium and develops into a fetus during pregnancy. The ovaries produce eggs, the fallopian tubes are the site of fertilization, and the vagina is the birth canal. The endometrium is shed during menstruation if no pregnancy occurs.

Explanation:
Protista includes unicellular eukaryotes such as protozoans (Amoeba, Paramecium), unicellular algae (Chlamydomonas, diatoms), and slime molds. They may be autotrophic or heterotrophic. Monera contains prokaryotes. Fungi include multicellular (except yeast) saprophytes. Plantae includes multicellular autotrophs. The protist kingdom is a 'catch-all' group for eukaryotes not fitting into fungi, plantae, or animalia.