• 1) How does the microbiome act as a physical and chemical barrier of the innate immune system?
• 2) How do NK cells recognize cells for destruction?
• 4) What is the difference between an antigen and a PAMP?
• 5) What are the similarities and differences between T-cell receptors (TCRs) and antibodies?
• 6) Early research suggests that the COVID-19 virus causes a cytokine storm in more severe cases. In general terms, how is a cytokine storm triggered?

In glycolysis two ATPs are generated at two different steps in stage two. The creation of ATP from ADP has a free energy change of +30.5 kJ/mol. Explain how this energy barrier is overcome for the metabolic process to proceed through these two steps?

(history) The U.S. in the Caribbean Please answer the following short-answer questions. Your answers should be paragraph-length (between 100 to 200 words)

1) How did the United States obtain control of the Panama Canal? What were the characteristics of the construction of the Canal under the U.S., when did the Canal open and what is its significance?

2) How would you characterize the relationship between the U.S. and so-called “Banana Republics”?

1. Describe how the rough endoplasmic reticulum is different from smooth endoplasmic reticulum.Structurally or Functionally

16. Why does FADH2 provide energy for 1.5 ATP molecules in the ETC, whereas NADH provides energy for 2.5 ATP molecules? ( Show calculations. )






17. How does each of the following regulate the CAC:

       a/ high levels of NADH
     
      
       b/ high levels of ATP
     
      
       c/ high levels of ADP

      
       d/ low levels of NADH




18. Where is ATP synthase for oxidative phosphorylation located in the cell?




19. Why do H+ leave the intermembrane space and return to the matrix of the mitochondrion?





20. Why do the enzyme complexes that pump H+ extend across the mitochondrial membrane from the matrix to the intermembrane space?

Stubble bristles (Sb) is dominant to wildtype bristles (Sb⁺) in Drosophila melanogaster. In a population where there are 137 flies with wildtype bristles and 836 flies with stubble bristles, what are the allele frequencies for the Sb and Sb⁺ alleles (assuming the population is in Hardy-Weinberg equilibrium)? Please calculated your answers to 3 decimal places.

f(Sb)=

f(Sb⁺)=

If the population is in Hardy-Weinberg equilibrium, what proportion of the population would you expect to be heterozygous?

Discuss the Ardipithecus ramidus fossil and its implications for understanding human evolution in 300 words

Using affinity chromatography, you have attempted to purify an enzyme as a fusion protein that was expressed in E. coli. SDS-PAGE analysis shows that the eluted sample contains the enzyme and it appears to be very pure.

Briefly describe, in general terms, a method you could use to determine the concentration of the enzyme in the eluted sample. Describe the advantages and disadvantages of your approach.

Which of the following products of the light dependent reactions is NOT used by the light independent (dark) reactions (Calvin cycle) of photosynthesis?

Cancer is considered by many a primarily genetic disease. However,what role does a lifestyle choice, such as smoking or a high cholesterol diet, play in the development of cancer? (CLO 4) Support your post through proper citations.

Functions of Signal Transduction (select any/all that apply):

1. a second messenger

2. Cell-cell communication

3. Cell’s response to environment

4. Intracellular homeostatsis- internal communication

1)Draw a chromosome and indicate where urban centers,deserts,genes,promoters and terminators would be located.
2)Name the two major molecules that are found in a chromosome
3)Describe how DNA is packed into a chromosome using the following terms:
a)DNA double helix
b)Histones
c)Nucleosomes

3)Define and contrast chromosomes and gene;
4)State the function of a gene.
5)Describe how Gene's are distributed along a chromosome (urban centers and deserts), and which base pairs tend to be most prevalent in coding and non-coding regions.

1. What lines of reasoning support the hypothesis that the first self-replicating systems were based on RNA molecules?
2. Why is the origin of cyanobacteria a critical step in evolution?
3. What evidence supports the idea that mitochondria and chloroplasts were once free-living members of the domain bacteria?

4. What evidence supports the classification of life into three domains?

5. Compare and contrast the physical and chemical conditions on Earth at the time life first arose with conditions today.
   a) Discuss two reasons why animals could not have existed on early Earth.
   b) In what ways has microbial metabolism altered Earth’s biosphere?
   c) How might life on Earth be different if oxygenic photosynthesis had not evolved?

Spiders have what kind of circulation?

A. Closed circulation with blood vessels

B. Intermediate circulation with some vessels and some areas where the fluid moves directly around tissues

C. Open circulation with fluid bathing all organs and tissues

D. None of the above