why do we need to test hypotheses in health-related or epidemiological research?

Consider a locus with two alleles - B and b. B is dominant, while b is recessive. There is no mutation. B has a selective advantage relative to b, so that the fitnesses of the three genotypes are BB = 1, Bb = 1, and bb = 1-s. In this case, s = 0.50, so that bb homozygotes have 50% fitness of heterozygotes and BB homozygotes. If the population has the following genotypic counts prior to selection of BB = 500, Bb = 250, and bb = 250, what is the expected change in the frequency of B after one generation with selection? Please give your answer to two decimal places.

Which of these tissues is not matched correctly with its function and/or structure?

A.nervous -- uses electrical signals for communication

B.bone -- solid connective tissue used for support and protection

C. cardiac -- found in the heart, voluntary muscle

D. transitional epithelium -- lines bladder and allows stretching

Is the correct answer D?

Describe the parts of the mesentery.

a) Explain the likely steps in pollen from the male cone travelling to, and then fertilising, an egg in the female cone scale

b) What are the similarities and differences between the female cone scale and the male cone?

c) Explain the main morphological features of the female cone scale and the male cone?

QUESTION 28

1. Which of the following is a presumptive test for the identification of Lancefield group A Streptococcus?

   	a.	Bacitracin susceptibility
   	b.	positive coagulase
   	c.	hippurate hydrolysis
   	d.	gram stain

1 points   

QUESTION 29

1. An organism grew at 37⁰C and 42⁰C from a stool culture oxidase, catalase, and Hippurate positive. This organism would be identified as:

   	a.	Campylobacter coli
   	b.	Campylobacter jejuni
   	c.	Streptococcus pneumoniae
   	d.	Aeromonas hydrophila

1 points   

QUESTION 30

1. A group of Canadian travelers were visiting the island of Kauai in Hawaii for a summer vacation. They noticed a cave in the middle of the island that contained a 10 feet deep pool of water. Much to their surprise, they were the only individuals enjoying this newly discovered swimming hole. A few days later, all swimmers became ill. Their physician believed they all had Weil disease. Which of the following organisms could cause this disease?

   	a.	Chlamydia trachomatis
   	b.	Treponema pallidum
   	c.	Borrelia burgdorferi
   	d.	Leptospira interrogans

Species X is diploid with a chromosome complement of AABBCCDD. A related species, Y, has chromosomes MMNNOOPPQQ. Please indicate how you obtain your answers.

a. How many chromosomes does Species X carry in each somatic cell?

b. What is the ploidy of normal somatic cells of Species X?

c. How many chromosomes does Species Y carry in each somatic cell?

d. What is the ploidy of normal somatic cells of Species Y?

e. How many chromosomes would an amphidiploid of Species X and Y hold in each cell?

f. What is the chromosome complement of the amphidiploid in the question above?

g. What types of chromosomal mutations do individual organisms with the following sets of chromosomes have? Please include the relevant species.

1. AAABBCCDD

2. MMNNOOOOPPQQ

3. AAABBBCCCDDD

4. AABBCDD

5. AABBCCDDMNOPQ

6. ABCDMMNNOOPPQQ

There has been a lot of controversy surrounding the use of genetically modified organisms (GMO) in food production. Your assignment is to take a side on this controversy. What evidence is in support of the side you choose? I want to talk about the negative side of it! about 500words. You will need to provide at least five (5) credible sources to support your argument.. Could someone help me answer this and put the 5 reference sites as well?

Photosynthesis Homework                                                             Name:_______________________

DIRECTIONS: Use Chapter 10 to help answer the questions and fill in the table below. Bring to class completed at the beginning of lecture.

1. Briefly describe the ‘big picture’ of what photosynthesis is all about. In your description, write out the chemical formula for photosynthesis and explain how each compound in the formula is related to the ‘big picture’.

2. Describe the specific purpose of the Light Capturing Reaction and the Calvin Cycle.

3. Fill in the descriptions of the table below.

Part I – Frustration

Ellie dropped her backpack beside the chair in Dr. Kern’s office and sat down with a sigh. Her hands trembled as she glanced again at the graded exm in her hand.

“It’s no better than the last one,” she mumbled. “I really, really tried this time, Dr. Kern. I did all the reading assignments before and again after class. I completed all of the study guide questions and rewrote my notes and made flash cards and studied with straight-A Cassie every week. But it didn’t make any difference. I still failed it.” She sniffled loudly and reached for the box of tissues on Dr. Kern’s desk.

Dr. Kern sat back and thought for a moment while Ellie made use of several tissues. Ellie was a junior in Dr. Kern’s physiology course and had struggled from the start of the semester. One-on-one help sessions and different study strategies hadn’t seemed to help. “I know how discouraged you must be, Ellie. Tell me again what you do when you sit down to study.”

“I read and review my class notes and reread the assigned sections in the book. But for some reason I can’t concentrate on much of anything for very long and, even when I can, I don’t remember what I’ve studied

by the next day. It’s so frustrating to spend so much time studying and not retain anything. If I fail this class, my GPA might drop enough that I’ll lose my scholarships. I’m so stressed that I can’t sleep, even when I try.”

Ellie broke off, and Dr. Kern gently tried to encourage her. “Let’s not give up hope yet. Sometimes you have to use new study methods for a while until you start to see some benefits. Let’s also take a look at your exam and see if there’s a pattern in the questions you missed.”

Ellie sniffled again. “OK, but I’m not very hopeful. I’ve been thinking about changing my major. All these upper-level courses seem so hard … there’s so much to learn in such a short time and I just don’t seem to get it even though everyone else does. I can’t stand the stress anymore.”

“Perhaps talking this over with your parents or a trusted friend would help,” Dr. Kern suggested. She noted Ellie’s strikingly large blue eyes that gave her a permanent look of surprise. Ellie was also quite thin, almost to the point of being too thin. Dr. Kern paused and chose her words with care. “I also know there are terrific folks over at the health center who are experts in how to deal with stress.”

Ellie gave a small, noncommittal smile and pushed a shaking hand through her hair. “Thanks, I’ll think about it. See you in class on Monday.”

However, Ellie didn’t come to class on Monday or Wednesday. She emailed Dr. Kern that she most likely had a sinus infection and would miss class on Friday to see a doctor. Dr. Kern shook her head at Ellie’s misfortune; missing a week of class was not going to make it any easier for Ellie to pull up her grade.

1. Note anything unusual about Ellie’s behavior or appearance.
2. What do you think might be going on with Ellie that could cause her difficulties? identify possible causes. Consider both physical and psychological cause.

Which of these best describes the gametophyte in the alternation of generations life cycle?

A. generation that produces the gametes

B. the diploid generation

C. generation that produces the spores

D. generation that has vascular tissue

E. uses meiosis within structures called sporangia

Plants have a/an _________ life cycle.

Which of these are gymnosperms?

In plants, the dominant generation is _________.

Problem 1. One of the consequences of ethanol addiction is fatty liver disease, an illness in which liver cells accumulate large amounts of triacylglycerols, the esters derived from glycerol and fatty acids. Ethanol is oxidized in the cytoplasm of liver cells by alcohol dehydrogenase and aldehyde dehydrogenase to yield acetate and 2 NADH. Acetate is then transported into the mitochondrion, where it is converted to acetyl-CoA and metabolized in the citric acid cycle.

1. Give a reason based on the products of ethanol metabolism and the electron transport chain for high energy charge in the cell
2. How would excess G6P concentration contribute to the reducing potential required for fatty acid synthesis?
3. How does acetate stimulate the rate of citrate formation based on enzyme kinetic?
4. How would the concentration of citrate in the mitochondria increase if the rate of isocitrate dehydrogenase rate were inhibited
5. What would inhibit the rate of isocitrate dehydrogenase if ethanol metabolism causes high-energy charge.