Life Science Grade 7 Chapter 2

admin / February 17, 2018
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 sat_flash_1s 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

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