Organelles
T or F: Only animal cells have mitochondria
What is homeostasis?
The need of an organism to stay stable by regulating internal conditions
What is the difference between passive and active transport?
Active transport requires energy, passive does not
What are the 3 stages of interphase?
G1 = Gap 1
S= synthesis
G2= Gap 2
T or F: Only eukaryotic cells have organelles
True
What organelle controls what goes in and out of our cells?
Cell/plasma membrane
In a positive feedback system, the output of a system _______ the response.
Intensifies
Strengthens
What are the 3 kinds of passive transport?
Simple diffusion, facilitated diffusion, osmosis
If a cell has 23 chromosomes at the beginning of G1, how many chromosomes will it have by the start of mitosis?
46
Remember DNA duplicates during the S phase
Concentration
What is the job of the rough endoplasmic reticulum?
To make proteins and package them for secretion
In a negative feedback system, the output causes the system to create a ________, which causes the system to return to ________.
1. counter response
2. set point, stabilization
What kind of active transport uses proteins to pump molecules against the concentration gradient?
Molecular pump
The chromosomes line up in the middle of the cell
What are stem cells?
Undifferentiated cells that can become differentiated into one or more types of specialized cells
What is the job of the chloroplast?
Human birth is an example of what feedback mechanism.
What will happen to a cell placed in a hypotonic solution?
It will swell, water will move into it
What happens to the cell during cytokinesis?
The cell is divided into two individual cells
Where are sister chromatids connected?
At the centromere
What four things are found in ALL cells?
Genetic material (DNA or RNA)
Cytoplasm
Cell membrane
Ribosomes
What are two examples of a negative feedback mechanism in the human body?
Temperature regulation (thermoregulation), Water concentration (osmoregulation), Blood pressure regulation
Large, polar molecules
What are the 4 stages of mitosis?
Prophase
Metaphase
Anaphase
Telophase
What is the result of mitosis
Two IDENTICAL daughter cells