What modifies the packing of DNA around histones and determines the accessibility of transcriptional molecules to target genes?

******biology*******

Compare and contrast between the two ATP generating energy systems: phosphagen system and the anaerobic glycolytic system. Base your answer on five different properties of each system and/or the type of activities they support.

Please write the answer for not a biology major (not too complex plz)

Give an overview of how Serratia Marcescens, Mycobacterium smegatis of bacteria might affect us as humans.

You engineer a strain of S. cerevisiae cells that express mutant histone octomer complexes that exhibit a negatively-charged DNA-binding surface. Which of the following would you expect to happen in a sample of these cells?

The chromosomes of the mutant strain would condense only during mitosis.

Nucleosome core particles would not form.

Epigenetic inheritance would be observed.

All chromatin in the mutant strain would be condensed.

The DNA would package too tightly for any gene expression to occur.

What DNA products would be generated if one of the proteins including DNA polymerase, DNA ligase, sliding clamp for DNA polymerase, nuclease that removes DNA primers, DNA helicase, and primase, were missing?

1. Match the following immunology term with the correct definition:

_____ Plasma Cell

_____ CD4

_____ opsonin

_____ epitope

_____ memory cell

_____ lysosome

_____ interleukin-1

_____ interferon

_____ histamine

_____ BCR

_____ phagosome

_____ neutrophil

_____ eosinophils

_____ diapedesis

_____ macrophage

_____ C3B

_____ Complement

_____ interleukin-4

_____ leukotriene

_____ TCR

_____ MHC II

_____ APC

_____ IgA

_____ CD8

1. In the first set of experiments, you dissolve 1g yeast in either water, or 10% solutions of different sugars. At room temperature, you set up the eudiometers in parallel, with lots of air in each flask before you begin. These are the results. Plot them using the scatter plot function, set the Y intercept=0, and display the equations of the trendlines on the chart, with the title and axes carefully labeled. You can select/copy/paste the data shown in each table by clicking the little icon in the upper left hand corner or you may use the Excel spreadsheet provided on Canvas. Insert your graph below the data table and answer the following questions. For all of the eudiometer experiments the CO₂ is measured in cubic centimeters or milliliters of displacement (of the colored water).

a) Which of the sugars are being used for cellular respiration by yeast at room temperature?

b) What is the rate of CO₂ production for glucose in this experiment?

c) Explain why yeast might not be able to use the other sugars for cellular respiration.

d) Consider the molecular structures of glucose and maltose. How might these results differ if you used 1M solutions instead of 10% solutions?

5. Can risk assessment be used for both familial and non familial cases of cancer?

6. What are the tests used for early detection of non familial colon cancer?

7. Is cancer age dependent? Give reasons

Explain why the rate at which allele frequencies change under drift is influenced by the effective population size, yet the neutral substitution rate under drift is uncorrelated with population size.

Im writing an unknown project for microbiology and I have to briefly introduce the subject of microbiology.

virology and parasitology homawork 1: ( be careful about the plaigarism )

Explain Cyprtosporidium infection. Talk about in which parasite group it is, its morphological forms, life cycle, transmission routes, diseases that it causes and diagnostic methods.

Imagine a case of reverse evolution – an animal evolved water-breathing from an air-breathing ancestor. Design the gas transport cascade for such an imaginary vertebrate taxon, which breathes water, can support O2 consumption rate of at least 50 mlO2/kg/min. You do NOT need to concern yourself with HOW this beastly transformation occurred, but you DO need to make sure that EACH STEP of the O2 transport cascade works quantitatively. Show your calculations for each step of the cascade. Your numbers must be feasible and “add up”.

If this animal encountered an air-breathing diving animal of the same size, metabolic strategy and aerobic capacity, how would their O2 transport cascades differ qualitatively?

Practice Problems for Bio 1:

1) Short hair is dominant over long hair in dogs. If a short-haired dog whose mother was long-haired is crossed with a long-haired dog, what proportion of the offspring will be short-haired?

2) The common grackle is a species of robin-sized blackbirds that are fairly common over most of the United States. Suppose that long tails (L) were dominant to short tails in these birds. A female short-tailed grackle mates with a male long-tailed grackle who had one parent with a long tail and one parent with a short tail. What is the male's genotype? What is the genotypic ratio?

2) A man with type O blood has a sister with type AB blood. What are the genotypes and phenotypes of their parents?

3) The inheritance of curly hair illustrates incomplete dominance. When a curly haired individual reproduces with a straight-haired one, the children all have wavy hair. What offspring would be produced, in what proportions, when two people with wavy hair reproduce?

4) Colorblindness is an X-linked trait recessive disorder. A woman who does not carry the color-blindness allele has children with a man who is color blind. What proportion of their children will be color blind?

5) Huntington disease (HD) is an autosomal dominant disorder. A person who is heterozygous for the Huntington disease allele has offspring with someone who does not have HD. What proportion of their children will have HD?