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1st 9 weeks Review
1st 9 weeks
Term | Definition |
---|---|
Biology | The study of living things |
Abiotic | Non-living |
Homeostasis | A relatively stable internal environment |
Hypothesis | A possible explanation for a set of observations |
Dependent variable | Is measured by the scientist and changes as a result of the independent variable |
Carbohydrate | Biomolecule that provides quick energy |
Atom | Smallest part of matter (non-living) |
Organ | Tissues that work together (living) |
Nucleotide | Monomer of nucleic acids. Sugar + phosphate group + nitrogen base |
DNA | Deoxyribonucleic acid |
Mitosis | Division of the nucleus. Prophase, metaphase, anaphase, telophase |
3 stages of the cell cycle | Interphase, mitosis, cytokinesis |
Somatic cell | Body cells. Reproduce through mitosis |
Cytokinesis | Division of the rest of the cell (cytoplasm & organelles) |
Metaphase | Second phase of mitosis. Spindle fibers attach to centromeres and chromosomes line up in the middle of the cell (equator) |
Active transport | Molecules move from low to high concentration, molecules move up the concentration gradient, and energy (ATP) is required. |
Telophase | Fourth phase of mitosis. Daughter chromosomes start to uncoil back into thinner strands of chromatin and nuclear membranes reform |
G0 phase | Cell rests before next division |
Cell membrane | Controls what goes in and out of the cells in order to help maintain homeostasis |
Passive transport | Molecules move from high to low concentration, molecules move down the concentration gradient, and NO energy is required. |
Anaphase | Third phase of mitosis. Centromere splits and spindle fibers pull sister chromatids to opposite ends of the cell |
Diffusion | Random movement of individual particles from high concentration to low concentration. A type of passive transport |
Osmosis | Diffusion of water across a selectively permeable membrane from high water concentration to low water concentration. |
Hypertonic | Water moves out of the cell and the cell shrinks. |
Endocytosis | The process of taking molecules into the cell by engulfing them in a membrane. Includes phagocytosis & pinocytosis. A type of active transport. |
Virus | Non-cellular particle made up of genetic material and a protein. Invades cells. Non-living. |
Lytic cycle | Viral replication in which the host cell lyses |
Bacteriophage | Virus that attacks bacteria |
Hypotonic | Water moves into the cell and the cell expands. |
Biotic | Living |
Exocytosis | The release of a substance out of the cell by the fusion of a vesicle with the membrane. A type of active transport. |
Prophase | First phase of mitosis. Long strands of DNA condense into chromosomes, nuclear membrane dissolves, centrioles move to opposite ends of the cell, spindle fibers begin to form |
Molecules | 2 or more atoms bonded (non-living) |
RNA | Ribonucleic acid |
Lipid | Biomolecule that provides energy storage |
Interphase | Growth and development to prepare for cell division. G1, S phase, G2 |
Isotonic | Water moves in and out of the cell at the same rate. No change is size of cell. |
Retrovirus | Virus in which RNA is transcribed into DNA |
Cell | Basic unit of structure and function (living) |
Nitrogen bases | Bind 2 DNA strands together. Adenine, Thymine, Guanine, Cytosine |
Protein | Biomolecule that expresses traits, builds & repairs body structures, and could be enzymes |
Organelles | "tiny organs" made of macromolecules |
Membrane pump | Molecules move against the gradient. Require a transport protein and ATP. A type of active transport. |
Capsid | A protein coat |
Tissue | Same kind of cell working together (living) |
Facilitated diffusion | Movement of molecules that are too large to pass through a selectively permeable membrane. Requires a transport protein. A type of passive transport. |
Vaccine | Prevents viruses |