AQA • Biology

AQA A-level BIOLOGY Paper 3 7402/3 june 2025

This document provides in depth information about cell specialization and all the point, questions and answers mentioned in the syllabus. The document includes resources for exams, past papers, diagrams, pictures and save my exams screenshots on top of explanations. Powerpoint links are also available. The document talks about different cells, its specializations, its adaptations, stems cells, differentiation and a lot more. This document is recommended to be read and memorized before the exam t...

aqa AS BIOLOGY Paper 1 (7401/1) Mark scheme June2023

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Global ecosystems are being severely impacted by climate change, which is mostly being caused by human activity like deforestation and the combustion of fossil fuels. Beyond just increasing temperatures, climate change has an impact on ecosystem structure, biodiversity, and the services that ecosystems offer.

The broad discipline of conservation biology is concerned with the study and protection of biodiversity, especially in light of the risks that human activity poses. The core of conservation biology is the need to safeguard endangered species, highlighting the significance of preserving the delicate balance of ecosystems and encouraging sustainable cohabitation.

Ecosystem resilience and health are influenced by biodiversity and ecosystem dynamics, two interrelated facets of the natural world. While biodiversity refers to the range of life forms found within these ecosystems, ecosystem dynamics refers to the processes and interactions that gradually affect the structure and function of ecosystems. Their interaction is essential to preserving ecological equilibrium and supporting life as we know it on Earth.

One of the most important aspects of cellular physiology is the delicate balance between autophagy and apoptosis, which orchestrates a harmonious interplay necessary for preserving cellular homeostasis and overall organismal health. The processes of autophagy, which is cellular recycling, and apoptosis, which is planned cell death, interact closely to control cell survival, preserve tissue integrity, and react to different stresses.

One of the fundamental ideas in biology that explains the diversity of life on Earth is the Theory of Evolution, which was mainly established by Charles Darwin. Natural Selection, the process by which species change over time based on the differential survival and reproduction of individuals with beneficial features, is the main tenet of this theory. This is a succinct overview: