A)How is the lac operon regulated if the bacteria is put into an environment where there is excess amount of lactose and glucose at the same time. (10 pts)

B)From the previous question, how would the outcome change if the glucose and lactose amounts are very low? (10 pts)

C)Where would the lac repressor be bound in E. Coli bacteria that is growing in low glucose and high lactose? (7pts)

What items do photosynthesis and cellular respiration have in common? For example:

Item: Produce ATP

Photosynthesis: light reactions

Cellular Respiration: Glycolysis, Krebs Cycle, Electron Transport

1. Upregulation of what surface receptor allows a mature thymocyte to leave the thymus? (explain in depth)

Compare and contrast how lipid soluble and amino-acid derived hormone signaling can control gene expression. At what level do they control gene expression? How do they control it? In your answer, be sure to explain: the flow of information from DNA to protein to describe how a gene is expressed and made into its protein product. Also the differences between receptors for amino acid-derived hormones and lipid soluble hormone

4. What four cells make up the pollen grain in Conifers?

5. Are coniferous sperm flagellated?

6. Where does fertilization occur and what structure becomes a seed in pine trees?

7. Explain double fertilization

8. Name the structures that precede the ones listed in the life cycle of a seed plant.

1. ____________ Female gametophyte

2. ____________ Male gametophyte

c. _____________ Adult sporophyte

9. What are the three parts of a seed in angiosperm

10. Compare conifers to flowering plants by completing the following table:

11. Compare the location of the ovule in the pine and the flowering plant.

12. What is the difference between pollination and fertilization?

1a) what is the relationship between substrate concentration and reaction rate?

b) Describe how the enzyme structure is effected:

1. i) below the optimal temperature

ii)above the optimal temperature?  

c)Why is enzyme activity reduced at pH values above or below the optimum? How does the enzyme structure change at non-optimum pH?

Based on the symptoms and virulence of each of these diseases, indicate for each disease whether there is a stronger selection for competition within hosts or stronger selection for movement across hosts. Defend your conclusion for each disease and list the major symptoms of each disease.

1.Tuberculosis

2.Covid-19

3.Ebola

List nine traits that developed during human evolution. Two species that have each trait (you can't use the same species twice so it must be two new species for each trait) and approximately in millions of years when these adaptations took place.

The duplication of the genetic content in a cell occurs during what part of interphase?

please answer these questions all of them for quick

1.  Pick two organisms that have traits that allow them to be perfectly adapted to their environments. For example, there are bright pink praying mantis that are perfectly camouflaged with pink flowers to allow them to be blended in with their environment so insects will not see them as they visit the flowers.  Do not use the example provided as one of your organisms!

2. Provide a picture of each organism showing the traits that adapted them to their environments and provide a detailed description of each trait.

3. Describe when the traits may have evolved for each organism.

1. A unicellular, photosynthetic organism could be:  a plant  a prokaryote  a fungus  a protist Select all correct answers from the list above. Briefly explain your reasoning.

2. What is bulk transport? Briefly explain why bulk transport is important for large organisms with complex multicellularity.

Why infections caused by eukaryotic parasites are harder to treat than those caused by prokaryotes? Explain and give examples. What is the most effective method to treat infections with Cestodes (tapeworms)?

How does emigration and immigration effect the gene pool of a population?