Moderators are used in nuclear reactors to slow down fast neutrons, making them more likely to induce fission in the fuel.

Mutations provide genetic variation, which is essential for evolution as it introduces new traits that may be subject to natural selection.

NADP+ acts as an electron carrier, becoming reduced to NADPH during the light-dependent reactions.

Neurotransmitters are chemicals that transmit signals across the synapse from one neuron to another.

Neurotransmitters are chemicals that transmit signals across a synapse from one neuron to another.

Nitrogen oxides contribute to ozone formation, the greenhouse effect, and are a precursor to acid rain.

Nucleotides are the building blocks of nucleic acids and carry genetic information.

Oxygen acts as the final electron acceptor in the electron transport chain during aerobic respiration.

Oxytocin is a hormone that stimulates uterine contractions during childbirth and is also involved in social bonding.

Parathyroid hormone (PTH) increases blood calcium levels by stimulating the release of calcium from bones and increasing calcium absorption in the intestines.

Phytoplankton absorb carbon dioxide during photosynthesis, playing a crucial role in carbon storage in the ocean.

Phytoplankton are crucial for oxygen production through photosynthesis and play a significant role in the carbon cycle.

Plasmids are small circular DNA molecules that can replicate independently and are commonly used as vectors to transfer genes into host cells in genetic engineering.

Platelets, or thrombocytes, are essential for blood clotting, helping to prevent excessive bleeding when injuries occur.

Preservatives are added to food to prevent spoilage and increase shelf life by inhibiting the growth of microorganisms.

Probiotics are beneficial bacteria that enhance gut health and improve digestion.

Producers convert solar energy into chemical energy through photosynthesis, forming the base of the food chain.

Ribosomes are the sites of protein synthesis, translating messenger RNA into polypeptide chains.

RNA polymerase is responsible for synthesizing RNA from a DNA template during transcription.

Root hairs increase the surface area for water absorption from the soil, facilitating the uptake of water and nutrients.

Sepals protect the flower bud before it opens and can also support the flower.

Sulfur is essential for the synthesis of amino acids and proteins, playing a critical role in plant metabolism.

Synovial fluid provides lubrication, nutrients, and shock absorption in synovial joints.

Tendons connect muscles to bones, allowing for the transfer of force and movement.

The cambium is a layer of meristematic tissue that contributes to the growth in thickness (secondary growth) of stems and roots.

The cell membrane regulates the transport of substances in and out of the cell.

The filament is the stalk that supports the anther, which produces pollen.

The loop of Henle plays a crucial role in the reabsorption of water and salts, helping to concentrate urine.

The lymphatic system is responsible for transporting lymph, which contains immune cells, and helps in the removal of waste products from tissues.

The M checkpoint ensures that all chromosomes are properly aligned at the metaphase plate before the cell proceeds to anaphase.