Explanation

• Mitochondria produce most of the ATP (adenosine triphosphate) in eukaryotic cells through aerobic cellular respiration.
• ATP is the main energy-carrying molecule of the cell.
• It provides energy for various cellular activities.

Additional information:

• ATP is also produced in the cytoplasm during glycolysis.
• In plant cells, chloroplasts also produce ATP during photosynthesis.
• It is mainly for use within the chloroplast.

Last verified on 27-10-2026

Explanation

• Plasmids are small, usually circular DNA molecules found mainly in bacteria, separate from the bacterial chromosome.
• They replicate independently and may carry genes that provide advantages, such as antibiotic resistance.

Last verified on 27-10-2026

Explanation

• Riccia is a simple liverwort belonging to the bryophytes.
• Its sporophyte is highly reduced and consists mainly of a capsule embedded in the gametophyte.
• In Riccia, the capsule lacks a well-developed seta and elaters.
• The spores are released when the surrounding gametophytic tissue decays.

Last verified on 27-10-2026

Explanation

• The lingual vein drains blood from the tongue region in a frog and carries it toward the venous circulation.
• The cutaneous veins carry blood from the skin, which is important for cutaneous respiration in frogs.

Last verified on 27-10-2026

Explanation

• Facilitated diffusion uses membrane transport proteins, such as channel or carrier proteins, to move substances from higher to lower concentration.
• This process is a type of passive transport, so it does not require cellular energy (ATP).

Additional information:

• Active transport moves substances against their concentration gradient and usually requires energy.
• Simple diffusion occurs directly through the membrane without transport proteins.

Last verified on 27-10-2026