8.7 Aids
HIV (Human Immunodeficiency Virus): A virus that attacks the immune system, specifically helper T cells (CD4 T cells). It weakens the body's ability to…
BiologyOpen
Loading learn tools
Loading topics
Loading home…Explore curated topics aligned to Class 9–12 curriculum. Filter by class and subject, or search by name.
2962 topics
HIV (Human Immunodeficiency Virus): A virus that attacks the immune system, specifically helper T cells (CD4 T cells). It weakens the body's ability to…
Thermal expansion is the increase in dimensions of a material when its temperature rises. Linear expansion: ΔL = αL₀ΔT.
Innate defenses act rapidly and non-specifically through barriers, inflammation, phagocytes, complement and natural killer cells.
Set is a collection of unique and unordered elements in Python, represented using curly braces `{}`, where duplicate values are automatically removed. In…
Computer software, often referred to simply as "software," is a collection of programs, data, and instructions that tell a computer how to perform specific…
A system of units is a complete set of units for all physical quantities. The International System of Units (SI) is the modern, globally accepted…
P(x1,y1) to Q(x2,y2): PQ = (x2-x1)i + (y2-y1)j. Translation adds the same vector to every point: A(-3,2) + [2,-1] = (-1,1).
DNA copies before mitosis/meiosis (S phase). Semiconservative: each new helix keeps one old strand (Meselson-Stahl named). Helicase named: unwind. DNA…
Diffraction occurs when waves bend around obstacles or spread after passing through an opening. It is most noticeable when the obstacle or aperture size is…
Electron Transport Chain (ETC): The electron transport chain is a series of electron carriers located in the inner mitochondrial membrane that transfer…
Artificial Intelligence (AI) is based on creating intelligent systems that can perform tasks that normally require human intelligence. Machine Learning…
9: both dominant phenotypes. 3: first dominant second recessive. 3: the other way. 1: both recessive. Each 3 is a recombinant look. 916: both dominant traits.…
Product Development is the process of creating a new product or service, or improving an existing one, to meet the needs of customers. It involves all the…
The two axes cut the plane into four quadrants, numbered anti-clockwise from the top-right. Quadrant I is ++ (x positive, y positive). Quadrant II is -+ (x…
Security in the context of devices and systems refers to the measures and controls implemented to protect information and systems from unauthorized access,…
If det=0, stop: no inverse. 2x2 swap formula. 3x3: row ops on the augmented identity. Check A A-1 = I on one row if time.
Functions of Kidney: The kidneys function as excretory as well as osmoregulatory organs. The excretory functions include the filtration of nitrogenous…
Use the unit circle and principal ranges to choose the unique allowed angle.
Engineered cells can produce human proteins such as insulin. Recombinant and nucleic-acid vaccines expose the immune system to a safe antigen or its…
On a number line every point has one coordinate. The distance between points with coordinates a and b is |b-a|. Absolute value is never negative, so distance…
Light-Dependent Phase (Light Reaction): The light-dependent phase of photosynthesis involves the absorption of light by the photosystems, excitation and…
A nucleophile (OH-, CN-, NH3 named) donates a pair to C d+ and X leaves as X-. Product: alcohol, nitrile, amine (school). Aqueous alkali: alcohol. Alcoholic /…
Import copies external data into the database, while linking keeps a connection to an external source.
The blood vessels that bring blood back to the heart are called veins. Characteristics: · Relatively not deep in the muscles. · Can be seen as blue vessels…