Microscopes
what kind of microscope have we used in class?
compound light microscope
what are the two organs in a plant and describe them.
shoot system - above soil, stem, leaves, fruit,
root system - below soil, roots, root cells/hairs
Define diffusion
Diffusion is the process of particles spreading out. This can happen across a membrane to equalize the concentrations in and outside the cell.
If the objective lens is 15x and the magnification is 405x what is the power of the eye-piece lens?
27x
What are the three differences between plant and animal cells?
cell wall, vacuole size, chloroplasts
How did Hooke contribute to cell research and microscopy?
He viewed them under a microscope and found that they looked like cells and coined the term "cells"
Why do we have specialized cells?
What happens when you put a cell in a high concentration solution (hypertonic)?
Water gets pulled out of cell - shrivels
Passive transport
objective lens x eyepiece lens
Name three types of organelles and their function
What can we do to a specimen to make the resolution better?
Staining - dye or fluorescences
What are tissues in a plant?
They are a collection of cells which all have the same function.
What are the 2 types of active transport and 3 types of passive transport we learned about?
simple, facilitate, osmosis
endocytosis, exocytosis
Convert 900 nm to mm
0.9mm
Which organelles do the main processes for getting energy and life to plant and animal cells? And what are those processes called?
Chloroplast - Photosynthesis
Mitochondra - Cellular Respiration
What are some fields or careers that you could use microscope in? (name at least two)
What kind of cell transport is it?
K+ is pumped into guard cells (active transport) then water follows potassium causing them to swell (osmosis).
Define a open, close and isolated system
open - matter and energy is exchange
close - energy is exchange
isolated - neither energy or matter is exchanged
If the FOV is 670 nm and the cell takes up about one half of the field of view, how big is the cell?
335 nm
What are the main functions of the cell membrane?
1. Barrier
2. Regulates Concentration gradient
3. communication and interaction with other cells
What is a defining characteristic of a scanning electron microscope or a transmission electron microscope?
3D image of specimen
Black and white 2D image
What kind of cell transport occurs in the phloem if the contents are being pushed from a area of low concentration (source) to an area of high concentration (sink).
active transport, this is because the nutrients and glucose are big molecules and need to be pumped against the concentration gradient.
What are the three points of cell theory
1. Cells make up all living things
2. Cells come from other cells
3. Cells are the smallest units of life
What is a unit conversion?
It is a fraction where the numerator and denominator where they are equal to each other, therefore making the fraction equal to 1.
what are the two other names for the cell membrane
1. fluid mosaic model
2. phospholipid bilayer