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SCI7CH2
Life Science Grade 7 Chapter 2
| Question | Answer |
|---|---|
| The ___ ___ is the life cycle of the cell. | cell cycle |
| ___ of the cell cycle include interphase, mitosis, and cytokinesis. | Phases |
| ___ is when a cell is preparing to reproduce. | Interphase |
| During the ___ phase, the nucleus and cytoplasm divide producing two new cells. | mitotic |
| The ___ of a cell cycle differs for different organisms and cells. | length |
| A cell performs specific ___ during interphase. | functions |
| ___ consists of three phases: G1, S, and G2. | Interphase |
| In ___ the cell grows and carries out normal functions. | G1 |
| Some cells such as muscle, nerve, and red blood cells, stay in G1 and never ___. | reproduce |
| In S phase, the ___ chromosome pairs in the cell’s nucleus replicate. | homologous |
| The copies of the chromosomes made during S phase are ___ ___. | sister chromatids |
| The replication ensures that the new cells formed are ___. | identical |
| In ___ phase, the cell grows and functions, and some organelles replicate. | G2 |
| ___ is the process by which the nucleus divides. | Mitosis |
| ___ is the process by which thecytoplasm divides. | Cytokinesis |
| Mitosis and ___ ___ ensure that each new cell receives all it needs to function. | cell division |
| Mitosis and cell division ___ old worn-out cells, and are the method of reproduction for some organisms. | replace |
| Mitosis and cell division produce most cells in a ___-___ organism. | many-celled |
| A different type of cell division produces ___ and egg cells. | sperm |
| There are ___ phases of mitosis. | four |
| In ___, DNA in chromosomes twists into tight coils and the nucleus breaks apart. | prophase |
| In ___, the chromosomes move to the middle of the cell and pairs of sisterchromatids line up. | metaphase |
| In ___, fibers attached to the centromere of the sister chromatids pull them apart toward opposite ends of the cell. | anaphase |
| In ___, a new membrane forms around each set of chromosomes, creating twoidentical nuclei, and chromosomes become less tightly coiled. | telophase |
| ___ is the final stage of cell division. | Cytokinesis |
| The cytoplasm and its contents divide to form two identical ___ ___. | daughter cells |
| At the start of cytokinesis, the cell membrane ___ inward. | pinches |
| In a cell with a cell wall, a ___ ___ forms between the two new nuclei. | cell plate |
| The cell plate later becomes the cell ___, which builds the new cell walls. | membrane |
| Cell division results in ___ new daughter cells to replace the original parent cell. | two |
| The daughter cells’ chromosomes are identical to the parent cell’s in ___ and type. | number |
| All the cells in your body, except sperm and ___ cells, have identical chromosomes. | egg |
| A ___-___ organism carries out all the functions it needs to survive. | one-celled |
| Prokaryotes, such as ___, do not have nuclei or membrane-bound organelles. | bacteria |
| Bacteria have ___ with specific functions. | structures |
| Some processes that occur in ___ in eukaryotes happen along specialized membranesin prokaryotes. | organelles |
| Each one-celled ___ has a nucleus and organelles with specialized functions. | eukaryote |
| One-celled eukaryotes include ___ and some fungi. | protists |
| One-celled eukaryotes are more complex than cells in ___-___ eukaroytes because theyare self-sufficient. | many-celled |
| Cells in many-celled organisms ___ on other cells to perform different functions. | depend |
| Some protists, including Volvox, live and function in ___ with specialized cells. | colonies |
| Many-celled organisms have many ___ and usually have more than one type of cell. | cells |
| Cell ___ is the process by which cells become different types of cells. | differentiation |
| Even though all cells in an organism have ___ sets of chromosomes, cells are able to differentiate by using different parts of the instructions on the chromosomes. | identical |
| Differentiated cells often have ___ structures and shapes to perform specificfunctions. | specialized |
| Liver cells have ___ ___ for filtering blood. | smooth ER |
| ___ cells are highly branched for sendingand receiving signals. | Brain |
| Once most human cells ___, they cannot become any other cell type. | differentiate |
| ___ ___ are undifferentiated; they can become different types of cells. | Stem cells |
| Some ___ cells can differentiate into another type of cell after they have differentiated into one type. | plant |
| A ___ is a group of cells, such as muscle fiber, that works together to perform a function. | tissue |
| An ___ is a group of similar tissues that work together to perform a function. | organ |
| Examples of human ___ are the heart, lungs, brain, stomach, and muscles. | organs |
| ___ have organs that store nutrients, transport substances, provide protection, andperform photosynthesis. | Plants |
| A ___ is an example of a plant organ | leaf |
| An ___ ___ is one or more organs working together to perform one or more functions | organ system |
| The muscular, digestive, and skeletal systems are examples of ___ ___. | organ systems |
| The ___ sends and receives signals to coordinate the organ systems in the body. | brain |
| The many-celled ___ is the most complex unit of living things. | organism |
| Each organ system has its own ___ but depends on other organ systems. | function |
Created by:
jnosik
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