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science test
chapter 4 test
| Question | Answer |
|---|---|
| what is Mitosis | the process in which the necleus divides into 2 indentical nuclei and it includes interphase metaphase ananphase and telophase |
| what is a chromosome | a structure in a cells nucles that contains heredity material |
| what is asexual reproduction | a type of reporduction that a new organism is made by just one parent organism types or asexual reproduction are budding fission and regeneration |
| what are the stages of the cell cycle | interphase, prophase, metaphase, anaphase, and telophase |
| true or false the speed of the cell cycle is different for every type of cell | true |
| true or false chromatin is a long thing strand that looks like spaghetti | true |
| what is a chromosome | DNA that is coiled up into shortened sections and appears thicker |
| what is a chromatid | one strand of the duplicated chromosome |
| what and where is the centromere | the centormere is the "button" that holds the chromosome together and it is usually located in the middle of the two chormatids |
| what are the centrioles | an organe that produces spindle fibers which pulls the chromatids apart |
| what happens in interphase | the cell grows and developes, the cell does its job and the DNA copies itself |
| what happens in prophase | the nuclear membrane and nucleolus disappear, centrioles move to oppsite sides of the cell, spindle fibers start to grow and chromatids pair up |
| what happens in metaphase | chromatids line up in middle of cell, spindle fibers attach to cemtromeres |
| what happens in anaphases | spindle fibers start to shorten |
| what happens in telophase | spindle fibers disappear, nuclear membrane and nucleolus reappear, cell membrane pinches in, chromosomes unravel |
| what is fission | the reproduction or bacteria |
| what is budding | an identical organism grows off the parent {ex hydra} |
| what is regeneration | an indentical organism grows from a piece of the parent |
| what is DNA | deoxyribonucleic acid, the gnetic material of all organisms made up of 2 twisted strands of super, phosphate, molecules and nitrogen bases |
| what is a gene | section of DNA on a chromosome that contains instuctions for making specific proteins |
| what is RNA | ribonuleic acid, a type or nuleic acid that carries codes for making proteins from the nucleus to the ribosomes |
| what is a mutation | any permanent change in a gene or chromosome can be benefical harmful or have little effect on the organism |
| true or false DNA is a blueprint for all living things | true |
| True or false DNA is a very small molecule | false |
| what does mRNA stand for | messanger RNA |
| what are the similarities of DNA and RNA | phosphates, adenine, guanine, cytosine |
| what are the differences in DNA and RNA | DNA has 2 strands RNA has 1 and DNA has thymine but RNA has uracil |
| how does DNA replicate | a gene untwists a little, unzips a little, nucleolicles fill in |
Created by:
bpKinlan
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