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Diffusion is the movement of molecules (gas, minerals and particles) from an area of higher concentration to an area of lower concentration. Diffusion is an important process that occurs within the cells of plants and animals. One example of diffusion is the exchange of oxygen and carbon dioxide during respiration. When we breathe in oxygen there is a higher concentration of oxygen in our lungs than in our circulating red blood cells, so oxygen diffuses across cell membranes from our lungs into our blood vessels and into our red blood cells to be distributed throughout our body. The reverse happens with carbon dioxide that we exhale. The carbon dioxide is more concentrated in our red blood cells (carbon dioxide is a by-product of cellular respiration - which we will study next) and is diffused into the lungs (lower concentration) and then we exhale releasing carbon dioxide into the environment. This carbon dioxide is taken in by plants to be used in photosynthesis.Another example of diffusion is when nutrients are taken into a plant. Plants utilize nutrients to grow and live and these nutrients are obtained by diffusion. Since nutrients are more concentrated in the soil around the roots, they diffuse into the roots and are carried throughout the plant to the various cells.Materials needed: 1 tube of food coloring (darker colors work best, but any color will do)1 large, clear drinking glass or similar containerWater (from your faucet)Procedure:1. Fill glass container almost to the top with cold water.2. Drop 3-4 drops of food coloring into the water.3. Observe for 2-3 minutes - taking photos to record the progress.4. Record your observations. How do you think diffusion helps nutrients, waste and other molecules move around the cell?
In the past, people infected with Hansen's disease were committed to leprosariums to prevent the spread of the disease. Explain why do you think that once treatments became effective.
Discuss/diagram the process from gene to protein. In other words, how do we build a protein based on a sequence of DNA?
A biologist was testing E. coli for thymidine requirement. She found a thy- point mutant and wanted to study reversion to thy+. She grew 20 cultures of the thy- mutant strain.
Why are pteridophytes better adapted to dry land than bryophytes? Were pteridophytes always less abundant than phanerogamic plants?
To maintain adequate nutrition, animals require dietary access to certain amino acids. How would you describe an amino acid that is "nonessential"? Provide an example of a nonessential amino acid.
In garden peas, the genes for pod color ans stem length are on different chromosomes. Green pod color is dominant; yellow is recessive. How are the alternative and lectin pathways similar?
What volume of a stock solution of 200 mM ethylenediaminetetraacetic acid (EDTA), pH 7 will you use to make up 400 mL of a solution containing a final concentration of 5 mM EDTA?
Cystic fibrosis is inherited with autosomal recessive allele individuals with autosomal dominant allele do not have the disease.
the original concentration in a sample is 2.79*10^6 CFU/ml. which sample volume should yield a countable plate? (express your answer as 10^x mL.)
In this case, we are tracking an enzyme secreted by pancreatic cells. What is its most possible pathway. Find out how many calories you will have saved by eating this reduced-fat product instead of the high-fat one.
Aniridia is a human condition in which the eye has no iris. The protein encoded by the gene responsible for Aniridia is very nearly identical to the protein product of the fly eyeless protein.
Write a general formula for a-amino acids and draw the actual formulae for any two named amino acids you choose. What is a peptide bond?
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