REVISION NOTES FOR PRELIM BIOLOGY: [ A LOCAL ECOSYSTEM ] ~ Ecosystems: “any area that contains living organisms interacting with each other and their environment. In a balanced ecosystem‚ there is a flow of energy through it and recycling of some materials” Inputs and Outputs of Ecosystems include: - the energy flow through the ecosystem; energy from the sun flows one way through‚ with heat loss at each trophic level - the input and recycling of inorganic and organic material (matter) - the
Premium Cell Bacteria Organelle
NOTES Biology Cell is the basic structural unit of life. Cork is a substance which comes from the bark of a tree. In 1665‚ Robert Hooke made the observation of a cell through a self designed microscope. Cell is a Latin word which means ‘a little room’. Important: Cells were first discovered by Robert Hooke in 1665. Leeuwenhoek (1674)‚ with the improved microscope‚ discovered the free living cell in pond water for first time. Robert Brown in 1831 discovered the nucleus in the
Premium Cell
AP Biology Mid-Term Study Guide 2015 Monitha Patel Chemical Bonding Compounds Sharing of a pair of valence electrons by two or more different atoms Molecule Two or more atoms held together by covalent bonds Ionic Electron attraction between two atoms Cations (+1) and Anions (-1) attract Covalent Sharing of valance electrons between atoms Nonpolar Electrons are shared equally O2 Polar Covalent Unequal sharing of electrons between atoms Two hydrogen atoms are bonded to a single oxygen
Free Protein Gene Adenosine triphosphate
Hormones and Metabolism Activity 1: Determining the Baseline Metabolic Rates 1. Which rat had the fastest baseline metabolic rate? Normal rate 2. Why did the metabolic rates differ? Because of the different organs that were removed from the two other rats that would produce certain hormones 3. If an animal has been thyroidectomized‚ what hormone(s) would be missing from its blood? thyroxine 4. As a result of the missing hormone(s)‚ what would the overall effect on the body and metabolism
Premium Diabetes mellitus Blood sugar Metabolism
Endocrine System: Biochemistry‚ Secretion and Transport of Hormones 1. Place the following hormones into one of the three categories of hormones (peptides‚ amines or steroids): T4 (thyroxin)‚ estradiol‚ norepinephrine‚ insulin‚ aldosterone‚ glucagon‚ cortisol‚ growth hormone‚ T3 (triiodothyronine)‚ epinephrine‚ testosterone and vasopressin (ADH). |Peptides |Amines |Steroids | |Insulin
Premium Hormone
Year 9 Biology Notes Keeping Healthy Test * Metabolic Rate- How quickly the chemical reactions (metabolism) are taking place within cells * In a balanced diet‚ you need- -Carbohydrates to build cells and to release energy. -Minerals and Vitamins in small amounts to keep the body functioning. -Water because we lose 70% form sweat‚ breath‚ tears‚ urine‚ faeces etc. -Fibre to prevent constipation and bowel cancer. * Malnutrition- eating a diet which is not balanced which can lead
Premium Bacteria DNA Gene
Biology Revision notes Ecology: 1) Ecosystems‚ sampling and population studies Population: All the individuals of a given species living together in the same area and at the same time. Community: Community: all the individuals of all the species living together in the same area and at the same time. Habitat: The area in which an organism lives within an ecosystem Niche: describes where an organism lives‚ what it does (its role)‚ what it feeds on and how it interacts with other organisms and the
Premium Biotic component Sampling Species
(e.g. maize) and a herbaceous legume (e.g. peas or beans). Animals: 1. Multicellular organisms 2. Cells do not contain chloroplasts and are not able to carry out photosynthesis 3. Cells have no cell walls 4. They have a nervous system 5. They often store carbohydrate as glycogen Examples include mammals (e.g. humans) and insects (e.g. housefly). Fungi: 1. They are saprophytic and feed by excreting digestive enzymes onto food and absorbing the digested products
Premium Cell Blood Bacteria
movement of molecules from a region in which they are highly concentrated to a region in which they are less concentrated. Diffusion occurs when a system is not at equilibrium. Several factors affect how fast a molecule will diffuse. The first of these is the kinetic energy of the molecule‚ which is most frequently measured as the temperature of the system. The size of the molecule also affects how rapidly it will diffuse. Diffusion can occur through a cell membrane. The membrane allows small molecules
Premium Oxygen Carbon dioxide Osmosis
Cell Biology Study Guide- Exam 1_______________________________________________ EXAMPLES OF MULTIPLE CHOICE/ TRUE AND FALSE QUESTIONS 1. Which of the following about the Cell Theory is FALSE? a) All cells come from preexisting cells through division b) All organisms consist of one or more cells c) The cell is the basic unit of structure for all organisms d) All cells must contain organelles e) None of the above 2. A student in a cellular biology laboratory is faced with the task of detecting
Premium Cell Eukaryote Organelle