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Science
Biology
Cell Biology
Cell Organelles and Cell Theory
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Ms. Moffitt's Bio Class
Terms in this set (30)
Nucleus
Control center of the cell that contain DNA.
Like the brain of a cell
Ribosomes
site of protein synthesis
Smooth Endoplasmic Reticulum
creates lipids or fat
Rough Endoplasmic Reticulum
An endomembrane system covered with ribosomes where many proteins for transport are assembled.
Endoplasmic Reticulum
A cell structure that forms a maze of passageways in which proteins and other materials are carried from one part of the cell to another.
Lysosomes
An organelle containing digestive enzymes
cell membrane
regulates what enters and leaves the cell
Cell Wall
surrounds cell membrane for protection & support in plants,
What organelle is porous
Cell wall
What does porous mean
water, oxygen, CO2, & other substances pass through easily
Golgi apparatus
organelle that modifies, collects, packages, & distributes molecules
Three parts of a Nucleus are
nuclear envelope, chromatin/chromosomes, nucleolus
Chromosomes
passed on from one generation of cells to the next
Nucleolus
contains RNA & proteins; where ribosomes are made
nuclear envelope
2 membranes that surround
nucleus of a cell
Chromatin
long, tangled strands of DNA
Cytoplasm
jelly-like material that surrounds organelles
Organelles
A tiny cell structure that carries out a specific function within the cell
Cellular activities necessary for life include?
acquiring energy
reproduction
adaptation
maintaining homeostasis
Mitochondria
Powerhouse of the cell
Used during cellular respiration
Chloroplast
An organelle found in plant and algae cells where photosynthesis occurs
Chlorophyll
A green pigment found in the chloroplasts of plants, algae, and some bacteria
Vacuole
Cell organelle that stores materials such as water, salts, proteins, and carbohydrates
Cell Theory
idea that all living things are composed of cells
cells are the basic units of life - new cells are produced from existing cells
Robert Hooke
first to observe "small chambers" in cork and call them cells.
Hans and Zacharias Janssen
Created the first compound microscope
Anton van Leeuwenhoek
Father of microbiology. Discovered bacteria on teeth with his creation of the microscope.
Matthias Schleiden
concluded that all plants are made of cells
Theodor Schwann
concluded that all animals are made of cells
Rudolph Virchow
discovered that all cells come from pre-existing cells
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Verified questions
physics
You stand on the end of a diving board and bounce to set it into oscillation. You find a maximum response, in terms of the amplitude of oscillation of the end of the board, when you bounce at frequency $f$. You now move to the middle of the board and repeat the experiment. Is the resonance frequency for forced oscillations at this point higher, lower, or the same as $f$ ? Why?
physics
A variable capacitor with a range from 10 to 410 pF is used with a coil to form a variable-frequency LC circuit to tune the input to a radio. (a) What is the ratio of maximum frequency to minimum frequency that can be obtained with such a capacitor? If this circuit is to obtain frequencies from 0.54 MHz to 1.60 MHz, the ratio computed in (a) is too large. By adding a capacitor in parallel to the variable capacitor , this range can be adjusted. To obtain the desired frequency range, (b) what capacitance should be added and (c) what inductance should the coil have?
engineering
The composite shaft shown in the figure is manufactured by shrink-fitting a steel sleeve over a brass core so that the two parts act as a single solid bar in torsion. The outer diameters of the two parts are $d_1=1.6\ \text{in.}$ for the brass core and $d_2=2.0\ \text{in.}$ for the steel sleeve. The shear moduli of elasticity are $G_b=5400\ \mathrm{ksi}$ for the brass and $G_f=12,000\ \mathrm{ksi}$ for the steel. (a) Assuming that the allowable shear stresses in the brass and steel are $\tau_h=4500\ \mathrm{psi}$ and $\tau_s=7500\ \mathrm{psi}$, respectively, determine the maximum permissible torque $T_{\max }$ that may be applied to the shaft. (b) If the applied torque $T=15 \mathrm{kip-in.}$, find the required diameter $d_2$ so that allowable shear stress $\tau_s$ is reached in the steel.
physics
A radio antenna broadcasts a 1.0 MHz radio wave with 25 kW of power. Assume that the radiation is emitted uniformly in all directions. a. What is the wave's intensity 30 km from the antenna? b. What is the electric field amplitude at this distance?
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