Name: ______Period: ______Date: ______
Illuminating Photosynthesis http://www.pbs.org/wgbh/nova/methuselah/photosynthesis.html# Read the introduction. Read the introductory poem. Click on “The Cycle” at the top of the box.
1. What gas does the child provide for the plant to use? ______
2. What gas does the plant provide for the child to use? ______
3. According to this animation, what 3 main things does the plant need for photosynthesis to occur?
(1) (2) (3)
Click on “The Atomic Shuffle” at the top of the box.
4. What type of molecule is shown in the leaf? ______
5. Draw one of the molecules below, as it is shown in the leaf.
6. According to the reading, these molecules “do not come from the tap.” What two places do they come from?(1) ______(2) ______
7. What is “stripped” from each water molecule? ______
8. From where does the cell get the energy to do this? ______
9. The stripped molecules form pairs. Where does it go after this? ______
10. What gas enters the leaf? ______
11. This gas enters through “holes” in the leaf. What are they called? ______
12. What molecule is formed once again? ______
13. Another molecule is formed (“and boy is it sweet”). Draw this molecule below as shown.
14. What is the name of this molecule? ______
Click on “Three Puzzlers.” Answer each of the following questions, and explain in your own words.
15. Can a tree produce enough oxygen to keep a person alive? Explain.
16. Can a plant stay alive without light? ______
17. Can a plant survive without oxygen? Explain.
Diffusion and Osmosis http://www.chem4kids.com/files/matter_solution.html
1. What is a solution? ______
2. Explain the difference between the solute and solvent. ______
Diffusion Animation: http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_osmosis_works.html
3. What TWO things do you notice about the movement of the particles?
4. At the beginning of the animation, how many particles are on each side of the membrane?
5. Are the particles moving in only one direction, or are they moving in both directions? ______
6. What is osmosis? ______
Genetics Science Learning Center http://gslc.genetics.utah.edu/
Click on the link under "Basics" on the left side of the screen called "Tour the Basics" …….What is a Gene?
1. What does DNA stand for? ______
2. Why is DNA called a blueprint? ______
3. The "twisted ladder" shape of the DNA molecule is called a ______
4. A DNA strand is made of ______which make up ______which make up sentences.
5. These “sentences” are called ______
What is a Gene? Hint - Look at the navigation bar at the top, you'll need to click on "What is a Gene" to continue.
6. What is a gene? ______
7. Blood cells use a protein called ______to capture and carry oxygen.
8. When a gene is changed, it is said to be ______
9. A mutation in the hemoglobin gene causes what disorder? ______
What is a Chromosome?
10. If you stretched out all the DNA from a single cell, how long would it be? ______
11. How many chromosomes are in a human cell? ______a mosquito? ______a carp? ______
What is Heredity?
12. The passing of traits from parents to child is the basis of ______
13. Every child receives______of its chromosomes from his mother and half from his ______
14. When a sperm and egg join, they create a single cell called a ______
15. Each child inherits a ______set of chromosomes.
“What is a Trait?”
16. Give an example of a physical trait: ______
17. A dog fetching a bone is an example of what kind of trait? ______
18. Scientists describe the set of information for each form of trait as an ______
Mitosis http://www.cellsalive.com/mitosis.htm
Read the text on this page and view the animation, you can slow down the video by clicking step by step through the phases. Which stage does the following occur?
1. Chromatin condenses into chromosomes ______
2. Chromosomes align in center of cell ______
3. Longest part of the cell cycle. ______
4. Nuclear envelope breaks down. ______
5. Cell is cleaved into two new daughter cells. ______
6. Daughter chromosomes arrive at the poles. ______
Watch the video carefully. The colored chromosomes represent chromatids. There are two of each color because one is an exact duplicate of the other.
1. How many chromosomes are visible at the beginning of mitosis? ______
2. How many are in each daughter cell at the end of mitosis? ______
3. What happens to the centrioles during mitosis? ______
4. Identify the stages of these cells:
Complete the following table:
Phase / What happens during this phase?Interphase
Early Prophase
Metaphase
Anaphase
Telophase
Go to www.johnkyrk.com/mitosis.html View the animation and sketch the cell in:
Prophase/ Metaphase / Telophase
Click on the Whitefish embryo and the onion root tip. For each organism, identify the stage of mitosis. http://www.biologycorner.com/projects/mitosis/whitefish_embryo.html http://www.biologycorner.com/projects/mitosis/onion_root.html
View 1 / View 2 / View 3 / View 4 / View 5Whitefish
Onion
Use the space below to draw the four stages of mitosis your own way, be sure to represent the major events of each phase.
www.cellsalive.com Click on “Meiosis”. Click on “Start the Animation”. Watch the animation and read the descriptions under the animations. Answer the questions below.
1. The process of meiosis begins with a ______cell.
2. Identify the following phases of meiosis based up on the descriptions below. Make sure to identify whether the phase is a part of Meiosis I or Meiosis II by placing a I or a II after the name of the phase.
A. ______Tension from the spindle fibers align the tetrads at the equator.
B. ______Spindle formation begins and the centrosomes begin moving toward the poles.
C.______Tetrads are created. Crossing-over occurs.
D.______Cleavage furrow forms beginning the process of Cytokinesis I.
E.______Chromatids separate and begin moving to the poles.
F.______Tension from spindle fibers align chromosomes at the metaphase plate.
G.______Chiasmata break apart and sister chromatids begin migrating toward opposite poles.
H.______Cleavage furrow forms beginning the process of Cytokinesis
http://www.lpscience.fatcow.com/jwanamaker/animations/meiosis.html ** Note: It is sometimes easier to google Lewport Meiosis page.
1. How many chromosomes does the cell in this animation start with? ______
2. The homologous chromosomes are represented by similar ______.
3. Copies of chromosomes are held together by the ______.
4. Each chromosome finds its ______.
5. How many chromosomes are at each pole of the cell? ______
6. During Meiosis II, chromosomes line up again along the cell’s ______.
7. Only ______copy of each chromosome moves towards the poles.
8. New membranes form around each ______.
9. Each cell divides, forming a total of ______cells.
www.sumanasinc.com/webcontent/anisamples/majorsbiology/ Click on “General Biology” and then click on Meiosis
10. Explain the difference between the cells that begin the process of meiosis to the cells, which are the final product of meiosis. ______
Click on “Step-Through” and answer the following questions.
11. When does DNA replication take place? ______
12. Meiosis consists of two cell divisions: ______& ______
13. Centrosomes (aka centrioles) migrate to ______.
14. The pairing of homologous chromosomes is called ______.
15. Crossing over points are called ______.
16. What happens in metaphase I? ______
17. What happens in anaphase I? ______
18. In prophase II, are the cells diploid or haploid? ______
19. What organelle divides in anaphase II? ______
20. What happens in telophase II? ______
21. Read the conclusion. Describe the genetic makeup of each of the four daughter cells produced by meiosis. ______
Click on “Check Your Understanding”. Take the quiz and answer the following questions.
22. With respect to meiosis, when does DNA replication occur? ______
23. When does crossing-over occur? ______
24. During which phase do chromosomes ling up along the equator? ______
25. During which phase does the nuclear membrane form around the chromosomes? ______
www.pbs.org/wgbh/nova/baby/ Click on “How Cells Divide”.
Mitosis vs. Meiosis / Mitosis / MeiosisOne cell division
Two cell divisions
Chromosomes pair up
Spindle fibers form
Centromeres do not divide in metaphase
Centrioles appears
Two daughter cells
Four daughter cells