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If there are no limits to growth, assume a certain bacterium that divides every 20
minutes would take exactly 3600 hours (150 days) before the mass of the bacterial
culture would equal the mass of the earth. For the same bacterium, at what time will
the mass of the bacterial culture be ½ the mass of the earth?
Explain with appropriate structure the contribution of carbohydrate in the A,B,O blood grouping system
a man homozygous for blood type A mariies a woman that is blood type AB. What is the probablity of the child with Blood type AB
What is the name of a protein that is used for structures?
Do you think bacteroid is indifferent from a typical Rhizobium? If yes/no- justify your answer.
2. Write down the role of flavonoids and leg hemoglobin in the infection process by Rhizobia.
3. What do you understand by oxidation and reduction reaction? Write down the different types of the oxidation and reduction reactions (with the name of end product) that occur in the sulfur cycles?
4. Soil bacteria conduct N-fixation by two different ways, write down the similar and different characteristics between these N-fixation processes?
An irony is that DNA is fundamentally a fairly simple molecule with only four different bases
- yet it is sufficient to code for the instructions to create proteins that make up an organism.
How many bases are needed to code for the 20 key amino acids (building block for a protein)?
What if only 16 amino acids were needed?
Why are most of the probiotic bacteria made up of Gram-positive bacteria but not Gram-negative bacteria?
Can you name a Bangladeshi food that may act as a probiotic supplement? Explain its health benefits and briefly.
Questions:
1. What are the major organizational levels among living things? Briefly discuss each level and
give examples.
2. What are the steps of scientific method? Discuss each step briefly.
3. What are the four (4) biomolecules present among living things? Briefly discuss their
function.
4. Discuss the two phases of photosynthesis.
5. Choose one (1) human organ system. Discuss the system’s function and parts. Give an
example of a disease related to the system.
6. What are the hierarchy levels of the current taxonomic classification among living
organisms? Give an example of an organism and state its taxonomic classification based on
the hierarchal levels.
What will happen if your body do not undergo glycolysis?
which events of calvin cycle do you think has the most important role in our life? Why?
