Misc 1
Yanelis- All things are made of atoms, but only living things are made of cells.
True
False
True
Jocelyn- What do plant cells have that animal cells do not?
Chloroplasts, a large central vacuole, cell wall
Jocelyn- What is the difference between a stimulus and a response in a feedback loop?
Stimulus- the initial change or disturbance that triggers a feedback loop
Response- the response is the subsequent action the system takes to counteract or amplify the stimulus
Moves large molecules (2 answers).
Active transport and facilitated diffusion
Jocelyn- Which eukaryotic cells have cell walls?
Fungi and plants.
Chris- What is one major difference between eukaryotic and prokaryotic cells?
Eukaryotic cells have a nucleus that contains their DNA, while prokaryotic cells do not have a nucleus—their DNA floats freely in the cytoplasm in the nucleoid region
Jocelyn- What is the function of the nucleus?
Stores DNA and serves as the command center of the cell.
Yanelis- What is a feedback loop / feedback mechanism?
A series of reactions and regulatory processes that helps an organism maintain homeostasis.
How does the structure of the cell membrane help control what enters and leaves the cells?
Lipids repel overly charged or large molecules. They have a hydrophilic head and a hydrophobic tail, which regulates what goes through.
Jocelyn- Who first observed the "cells" in cork and named them?
Robert Hooke
What does “homeostasis” mean?
Homeostasis is the process by which living organisms maintain a stable internal environment despite external changes
Yanelis- Is cytosol or cytoplasm the one that's a gel-like substance?
Cytosol
Is fruit ripening a positive or negative feedback loop?
Positive.
Chris- What is the main difference between active transport and passive transport?
Active transport requires energy (ATP) to move molecules from low to high concentration, while passive transport does not require energy and moves molecules from high to low concentration
Who was the first person to observe living cells under a microscope?
Anton van Leeuwenhoek
Jessy- What does the lysosome do?
Can trigger apoptosis and digest materials within the cell.
Yanelis- The nucleolus produces which organelle?
Ribosomes
Chris- What is the purpose of a negative feedback mechanism in the body?
Negative feedback helps the body maintain homeostasis by reversing a change—for example, lowering body temperature when it gets too high.
Define hypertonic.
The solute concentration is very high outside of the cell, causing the water to leave the cell. The cell will shrink.
Peroxisome breaks down hydrogen peroxide using what?
Postal workers of the cell.
Endosome.
Chris- What is the function of the mitochondria?
Mitochondria produce energy for the cell in the form of ATP through cellular respiration.
Jessy- Why do we get fevers as an immune response when we get sick? Why is a high fever so dangerous?
Our body heats itself up to kill off any invading bacteria or viruses. It can get dangerous because our internal temperature exits homeostasis and can cause death.
A gummy bear is placed in a beaker of water for 2 days. It swells when it is checked on again. Is the solution hypotonic, hypertonic, or isotonic?
Hypotonic.
Define Cell Theory.
Cells are the fundamental unit of life.
All living things are composed of cells.
Cells arise only from pre-existing cells.
Cells carry genetic material in the form of DNA, which is passed from parent to daughter cell.