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