click below
click below
Normal Size Small Size show me how
science7 1st 9 weeks
7th Grade Science 1st semester exam with Mrs. Haggard
Question | Answer |
---|---|
Qualitative observation | Descriptions not described with numbers |
Quantitative observation | number of things or amount |
Mass | The amount of material in an object |
Volume | The amount of space something takes up |
Density | The mass of a certain volume of a material or mass per unit volume |
Triple beam balance | A tool that measures how much mass something has |
Eukaryote | Cells have a nucleus with a membrane around it |
Prokaryote | Cells that have no membrane around genetic material |
Heterotroph | cannot make food for itself |
Autotroph | can make food for itself |
Passive transport | The movement of dissolved materials through a cell membrane without using celular energy |
diffusion | The process by which molecules move from an area of higher concentration to an area of lower concentration |
osmosis | Diffusion of WATER molecules through a selectively permeable membrane |
active transport | The movement of materials through a cell membrane using the cells own energy |
Photosynthesis | The process by which a cell captures the energy in the sunlight and uses it to make food |
stomata | Small openings on the underside of the leaves |
chlorophyll | The main pigment found in the chloroplasts |
Respiration | The process by which cells obtain energy from Glucose(sugar) |
Mitosis | The process of cell division where one copy of DNA is distributed into two daughter cells (division of the nucleus) |
Trait | Physical characteristics of organisms |
Gene | Factors that control traits |
Allele | The different forms of a gene |
Phenotype | An organisms physical appearance or visible traits |
Genotype | An organisms genetic make-up |
Dominant Allele | An allele whose trait always shows up in the organism |
Recessive Allele | An allele whose trait is masked in the presence of a dominant allele |
Homozygous/pure | Genes are alike for a particular trait |
Heterozygous/hybrid | Genes are different for a particular trait |
Meiosis | Cell division that produces gametes |
Pedigre | A chart or family tree that tracks which family members have a particular trait |
Punnet square | A chart that shows all the possible combinations of alleles that can result from a genetic cross |
Karyotype | A picture of all the chromosomes in a cell |
Carrier | A person who has one dominant allele for a trait and one recessive allele but doesn't have the trait |
Cloning | An organism that has exactly the same genes as the organism from which it was produced |
Mutation | Any change in a gene or chromosome |
Protein synthesis | Production of proteins off a DNA strand |
Evolution | The gradual change in a species over time |
Adaptation | A trait that helps an organism survive and reproduce |
Variations | Any difference between individuals of the same species |
Species | A group of similar organisms that can mate with each other and produce fertile offspring |
Homologous structures | Similar structures that related species have inherited fro a common ancestor |
Natural selection | The process by which individuals that are better adapted to their environment one more likely to survive and reproduce than other members of the same species |
Fossil | The preserved remains or traces of an organism that lived in the past |
2 causes of genetic disorders | 1. Mutation in DNA of genes 2. Changes in overall structure or number of chromosomes |
Protein synthesis takes place in | The ribosomes in the cytoplasm |
Who are sex linked traits more common in and why | Males because they only have one X chromosome |
How do you determine if it is a boy or girl | You look at chromosome pair 23 and if the chromosomes are the same then it's a girl and if they are different then it's a boy |
Differences between DNA and RNA | 1. Nitrogen bases(T,A, C,G for DNA) (U,A,C,G for RNA) 2. 2 strands for DNA and 1 strand for RNA 3. Different sugar molecules |
Density Equation | Mass/Volume |
3 parts of cell theory | 1. All living things are made of cells 2. Cells are the basic unit of structure and function 3. Cells are produced from cells already living |