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7th grade Science Review Boxes
Transcript of 7th grade Science Review Boxes
Are you ready?
7th Grade Science Review Boxes
This review is just the tip of the information you learned in science in 7th grade. You really need to study it and review to know the whole "iceberg"
Explain the function of the cell’s organelle:
Chloroplast- Makes the food of the plant cell. ONLY in plant cells and some protists
Cell wall (only in plants)-cell walls made of cellulose for support and strength.
Cell membrane- (In all cells)the covering of the cell. Controls nutrients into the cell and sending waste products out.
Nucleus-The nucleus is the control center and tells all of the other organelles what to do. The nucleus also stores the DNA.
Vacuole- storage areas in both animal and plant cells but are much larger in plants
Cytoplasm-is the fluid that fills a cell
Endoplasmic Reticulum: where most chemical reactions take place. The cell makes lipids and other
chemicals and it sometimes has ribosomes attached.
Lysosome: known as the cleaners of the cell. Found in all animal cells. They digest things and break them up.
Golgi bodies: Packages products from the ER and the ribosomes into their final form and send them to cells that need it.
Mitochondria :the powerhouses of the cell. Mitochondria take in sugar and create ATP, the type of energy your cells need to function.
Ribosomes In every cell has, including bacteria. Ribosomes use DNA to make proteins.
Evidence for Evolution
Case Study: Whales
Fossil record - Transition animals in rock layers show they were once ocean animals, with legs, pelvic bone, moving nostrils
DNA - all livings things have DNA or RNA and it shows that this is something conserved over time, that they have a common ancestor
Structures - bones even today show they have flippers closer to our hands/mammals than to fish fins (they use their backbone
to move up and down rather side to side like a fish
Radiometric Dating - Shows that fossils can be millions of years old, and whales once lived in ancient seas that no longer exist
Define/Describe the following words:
Chromosome - A long strand of DNA in the nucleus of a cell
Gene - A segment of DNA that codes for a particular trait
Dominant-Allele/trait that shows up in appearance whenever present. Represented by a capital letter. ex: B for black dominant hair
Recessive - Allele/trait that is masked by a dominant trait and only appears when two copies are present ex: b for white recessive hair.
Heterozygous - Two different variations of a trait are present (Ex. Aa)
Homozygous - Two of the same traits are present (Ex. AA or aa)
The chart starts here but we can go back even smaller.
*Draw an example of each from the picture on the next page!
Lets talk about Genetic crosses
and punnett squares
Tom and Alice are the parents of four children. Tom has earlobes ?that are not attached, which is dominant (E). Alice has earlobes that ?are attached, which is recessive (e). Fill out 2 Punnett squares that ?could describe their family.
Let's talk about the levels of Classification:
There are 3 Domains!
All of the kingdoms fit into
these three domains
You need to memorize the Animal Phyla's and their characteristics=so basically this page!
Most energy available to the next level
Least amount of energy avaliable
The arrows show where the energy starts and where it is transferred to in a food web!!
Draw the web and the Sol note!
**Watch the next movie and explain how each picture shows each term.
Write an adaptation for each animal to survive in each biome
The fossils show the loss of their arm as it becomes more fin like.
Living things, no matter their complexity, need to carry out the following processes to be successful:
1. Exchange Gases:
Animals: take in oxygen and release carbon dioxide
Plants: take in carbon dioxide and release oxygen
2. Obtain and Use Energy: Energy is used to power cells
Animals: eat to obtain energy
Plants: make their own food through photosynthesis
3. Respond to Stimuli: sense and respond to changes in the environment
4. Grow and Develop: get bigger and change over time
5. Reproduction: make more individuals
Let's talk about how organisms and species change over time:
Let's Talk About DNA!
Let's Talk About Energy and Interactions in Ecosystems
An ecosystem is made of all of the living and nonliving factors in an area.
Let's Talk About:
The Needs and Characteristics of Living Things
How They Are Organized and Classified
Let's Talk About Cells and Cell Division!
Evolution is the idea that species must change over time to adapt to their environment. If they don't change, often a species can become extinct.
This process happens through...
Those animals that are best adapted to their environment will survive and produce more offspring than others. That way, their specific traits get passed down to the next generation.
It Leads to:
An inherited (gotten from parents) characteristics that increases an organism's ability to survive.