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Human Biology

Growth rate of phototrophic purple bacterium Rhodobacter

The growth rate of phototrophic purple bacterium Rhodobacter is twice as fast when the organism is grown phototrophically in a medium with malate as a carbon source as when it is growth with CO2 as a carbon source (with H2 as electron donor). Discuss reasons why and list the nutritional class of Rhobacter when growing under each

Effects of Iodine on Glands in Endocrine System

When reactor 4 at the Chernobyl Nuclear Power Station in Ukraine exploded on April 26, 1986, a great plume of radioactive isotopes erupted into the air and spread for thousands of miles. Most of the isotopes emitted after the blast were of the element iodine. Which of the glands of the endocrine system would be most seriously af

Calculating Bacterial Numbers in Culture

Starting with 4 bacterial cells per milliliter in a rich nutrient medium, with a 1 hour lag phase and a 20 minute generation time, how many cells will there be in 1 liter of this culture after 1 hour? After 2 hours?

Heptachlor IRIS Database

Go to the EPA IRIS data base at Click on List of IRIS Substances. Select Heptachlor (not the QuickView). Answer the following questions in your own words: a. What is meant by oral reference dose? b. What types of studies did the EPA use to estimate the oral reference dose? (human,

Nutrition and dehydration

I need answers for the following questions: 1. Why is water essential to health maintenance? 2. What are the functions of water in the body? 3. What happens to the body when it does not get the water it needs? 4. Compare and contrast how different electrolytes - sodium, potassium, and chloride-function in the body. 5.

Punnett squares

Problem 1: Dalmatian dogs occur in two colors - normal black spots and bown (liver) spots. Assume that the black-spotted condition is dominant over the brown-spotted condition. Please determine the following: a) The letters you would use to identify the alleles for a black-spotted dog and the alleles for a brown-spotted

Polymerase chain reaction problem

I have using sterile technique, made up in an eppendorf tube the following: Sterile water 15 ul, primer 1 @ 30ng/ul, primer 2 @ 30 ng/ul, DNA Preparation (listeria or e.coli 5 ul), Mastermix 25 ul. I mixed the tubes and heated them, and carried out the elecrophoresis for staining to obtain a photograph. I need to

Anatomy/Physiology of Respiratory, Urinary System, Fluid and Electrolyte

1. The pharynx is common to what 2 systems? 2. What is the voice box? Of what is it composed? What is the Adam's apple? 3. Describe the structure and function of the trachea. 4. Describe respiratory physiology. 5. What is the main respiratory muscle? 6. List the principal and accessory organs of the urinary system

bacteria species characteristics

For the following two bacterial species: Saccharomyces cerevisiae and Lactobacillus acidophilus 1. What their basic cell shape (rod, spheres, etc)? 2. What type of cell envelope they have (gram negative, gram positive, or others)?

Agarose gel electrophoresis - why does my bp not add up?

Will be as brief as I can! - any help would be appreciated. used 3 lanes on my gel and ran in each: lane 1: hyperladder (linear fragments) lane 2: EcoR1 digested recombinant pUC18 (size of insert unknown) lane 3: undigested recombinant pUC18 plasmid Results obtained from gel and standard curve: lane 2: 2 bands app

Asthma as an epidemic in children

How is asthma affecting children and what is being done about it. a short cause and effect study in asthma and its ramifications with the children and the environment

Working out a Conversion Factor for Glucose Tolerance Test

Hi. I have to write a practical report for Glucose Tolerance test. I have tried and tried but am struggling. I need to take into account any sampling and or dilution involved in the experiment and work out a conversion factor(hope that makes sense)so that my results can be expressed as mg of glucose per 100cm3 of original bloo

Bioinformative Assignment - Diagnostic Restriction Digests

THE PROBLEM you have decided to study DNA repair and recombination in E.coli. your best buddy from graduate school sends you a clone of the recA gene. she has told you that the gene is included in 3.266 Kb Bam HI genomic fragment that she has cloned into the pBC vector. however, she has neveer checked the orient

Monod Kinetics

Bacteria used to degrade a contaminant in a bacth reactor are found to grown on the contaminant with Monod Kinetics. Assuming Umax (the max specific growth rate)=10 per day, and Ks (called half velocity constant)=5mg/L and Kd (the decay constant)=0.05 per day. At what value of S (the substrate concentration) will dX/dt=0. (X

Inheritance of dibetes mellitus

Hundreds of human diseases are characterized by a genetic component, such as familial breast cancer. These diseases may run in your family and can currently be tested for. Prepare a 200-word report for your own family members about the current state of knowledge on any such diseases and the tests available. Describe the disease,

Supporting or Refuting Taxing High-Fat Foods

In the United States, many states now impose taxes on tobacco to discourage smoking and to help offset the health costs associated with smoking. However, heart disease, which has been linked to a high-fat diet, is the country's number one killer. In addition, more cancer cases in the United States are related to diet than to smo

How do physical and chemical laws limit animal form?

Explain how physical and chemical laws affect a living organism. Also, provide an example of how an organism has evolved to adapt to its physical or chemical environment. Then, answer the following question: Why do you think physical and chemical laws relate functions to structures and vice versa?

Nutritional Caloric Content

In lab, you try burning marshmallows to estimate their caloric content. a) if a large marshmallow, when burned completely, raises the temperature of 1L of water 40 degrees, what is the approximately caloric content measured in nutritional calories (kcal or Cal)? b) how many calories would be required to raise 500g of water 3 de

Genetic Technology

One of the concerns mentioned in the chapter regarding the use of genetic technology centers around privacy issues such as "genetic discrimination." Once we improve our ability to screen the human genome for disease susceptibility, is there any level of testing that should be required by society as a means of reducing health car

Sport supplements are examined.

Companies that sell sport supplements make billions of dollars each year claiming by consuming their products the person can lose or gain weight. Assume the body weight is genetically determined and that any gain or loss in weight will cause the body to activate homeostatic mechanisms to cause the body to return to the original

Sports Srinks, Electrolytes and Hydration.

When it replenishes these nutrients, it can rehydrate and regulate its body temperature. Once the body temperature returns to normal, it can then return to physical activity. Explain why sports drinks might or might not aid in thermo regulation. Why do you think knowing abut thermo regulation can help you make informed choices a

Negative Feedback Loops

How might negative feedback loop explain why people who lose large amounts of weight chain that weight back? Explain the weight cycle in perms of the negative feedback loop. Do you think that weight in humans is regulated by a negative loop? Why or why not? Do you think weight is controlled by a negative feedback loop that is ge

Sickle-Cell Anemia

The text notes that an alternate allele of the hemoglobin gene can cause sickle-cell anemia when a person is homozygous for this allele, but that a person who is heterozygous for the allele actually can derive a benefit from it--protection from malaria. In the United States, 8 percent of African Americans are carriers for the si

Protein Production in Down's Syndrome

People who are born with the condition called Down syndrome generally have three copies of a certain chromosome (chromosome 21), rather than the usual two copies. In 200 words, what can you deduce from this regarding the proteins produced by a person with Down syndrome?

Physiological changes occur during exercise

Many physiological changes occur during exercise. a. Design a controlled experiment to test the hypothesis that an exercise session causes short-term increases in heart rate and breathing rate in humans b. Explain how at least three organ systems are affected by this increased physical activity and discuss interactions among t