Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
LS Semester 1 Test
Cards to study for 7th grade life science semester 1 exam.
| Question | Answer |
|---|---|
| A ________________________ is a representation of an object or a system. | model |
| The study of living things is ______________________________________. | life science |
| Organisms maintain internal stability despite threats by external stimuli through ___________________. | homeostasis |
| Molecules that are sometimes called the blueprints of life are __________________________________. | nucleic acids |
| All of the chemical activities that an organism’s cells perform are called __________________________. | metabolism |
| A living thing that makes its own food. | producer |
| A series of steps followed by scientists to solve problems. | scientific method |
| A living thing that breaks down the nutrients of dead organisms | decomposer |
| set of related hypotheses supported by evidence | theory |
| Used to produce clear and detailed images of non-living specimens | electron microscope |
| The major energy-carrying molecule in the cell | ATP |
| The lowest level of organization is the _____________________. | cell |
| Particles move randomly from an area of high concentration to an area of low concentration during ____________________________. | diffusion |
| Pairs of chromosomes are called ______________________________________. | homologous chromosomes |
| When oxygen breaks down food to release energy, it is called ______________________________. | cellular respiration |
| the reason that most cells are limited to a very small size | surface area-to-volume ratio |
| small bodies in a cell’s cytoplasm that are specialized to perform specific functions | organelles |
| an organism that consists of a single cell that does not have a nucleus or membrane-bound organelles | prokaryote |
| prokaryotes that include extremophiles, organisms that live in extreme conditions | archaebacteria |
| an organism made up of cells that have a nucleus enclosed by a membrane as well as membrane-bound organelles | eukaryote |
| an organelle that functions as the main power source of a cell, breaking down sugar to produce energy | mitochondria |
| organelles in which photosynthesis takes place | chloroplast |
| If an allele in a Punnett square is written Bt, ______ is the dominant trait. | B |
| In the second generation, ____________________________ reappear after disappearing in the first generation. | recessive traits |
| When sequences of base pairs are copied incorrectly, they are called a_______________________. | mutation |
| Examples of chemical _________________________ include asbestos and chemicals in cigarette smoke. | mutagens |
| The pairing of bases allows cells to __________________________. | replicate |
| Adenine and ____________________________ bases fit together. | thymine |
| Cytosine and ____________________________ bases fit together. | guanine |
| If there is 30% cytosine in a sample, there will be 20% ________________________________. | adenine |
| fertilization of one plant to another | cross-pollination |
| when one trait is not completely dominant over another | incomplete dominance |
| a way to organize possible offspring combinations | Punnett square |
| an organism’s appearance | phenotype |
| the entire genetic makeup of an organism | genotype |
| the mathematical chance that something will happen | probability |
| process that produces cells with half the number of chromosomes | meiosis |
| process where the nucleus divides once | mitosis |
| cell organelle where protein is synthesized | ribosome |
| the form of mutation where one base is replaced by another kind | substitution |
| material shaped like a double helix that determines inherited characteristics | DNA |
| the material made of amino acids that causes most of the differences we see in organisms | proteins |
| bacteria that break down dead organisms | decomposer |
| an organism with no nucleus | prokaryote |
| an organism that invades a cell and uses it to create more organisms | virus |
| bacteria that cause disease | pathogenic bacteria |
| type of cell in which viruses reproduce | host |
| a protist that makes its own food. | producer |
| a protist that invades another organism to get the nutrients it needs | parasite |
| An animal that has a backbone. | vertebrate |
| an organ in fish that removes oxygen from the water and exchanges it with carbon dioxide from the blood. | gills |
| saclike organ that takes oxygen from the air and delivers it to the blood | lung |
| a mammal that lays eggs | monotreme |
| a mammal with a pouch, such as a kangaroo, koala, or opossum | marsupial |
| the muscle that helps bring air into the lungs | diaphragm |
| a soft feather that provides warmth | down |
| a stiff outer feather that determines shape | contour |
| the upward pressure on wings | lift |
| the act of sitting on a nest to keep eggs warm | brooding |
Created by:
missdietrich
Popular Biology sets