BioChemistry Test

/in /by

BioChemistry Test.

Question 1.1. Rank butane (CH3CH2CH2CH3), butanoic acid (CH3CH2CH2COOH), and pentane (CH3CH2CH2CH2CH3) in order of increasing boiling point. (From lowest to highest.) (Points : 3)

butane < butanoic acid < pentane        butane < pentane < butanoic acid        butanoic acid < pentane < butane        pentane < butanoic acid < butane

 

Question 2.2. Choose the equilibrium constant that indicates the greatest relative amount of reactant concentration at equilibrium. (Points : 3)

1.1 x 10–7        2.3 x 107        6.7 x 102        8.3 x 10–2

 

 

Question 3.3. Which of the following is the conjugate acid of NH3? (Points : 3)

NH2-        NH4+        HNO3        H3O+

 

 

Question 4.4. What volume of 0.200 M HCl is required to completely neutralize 50.00 mL of 0.150 M KOH? (Points : 3)

7.50 mL        50.0 mL        66.7 mL        37.5 mL

 

 

Question 5.5. The fluid mosaic model  proposes that (Points : 3)

membranes can move like a fluid.        proteins are embedded into the cell membrane.        materials that are fluid move across a membrane.        the composition of membranes includes a mosaic fluid

 

 

Question 6.6. The IUPAC name of the molecule below is                                        (Points : 3)

hydroxyl -2,4-dichlorocyclohexene        3,4-dichlorophenol        2,4-dichlorophenol        1,3-dichlorophenol

 

 

Question 7.7. Which of the following is the conjugate base of the acid, carbonic acid?  (Points : 3)

H2CO3        H2O        H3O+        HCO3–

 

 

Question 8.8. How many alkane constitutional isomers exist with the formula C5H12? (Points : 3)

2        3        4        more than 5

 

 

Question 9.9. The side chain of the amino acid tyrosine is shown here. The side chain is classified as ___. (Points : 3)

nonpolar        polar-acidic        polar-basic        polar-neutral

 

 

Question 10.10. Which of the following lipids is not derived from cholesterol? (Points : 3)

progesterone        thromboxane        cortisol        testosterone   51.Which is an α-amino acid?   *a)  b)  c)  d)

 

 

Question 11.11. Antacids may contain which ion to reduce acidity? (Points : 3)

Na+        CO32–        Al3+        Cl–

 

 

Question 12.12. In which of the following levels of protein structure can hydrogen bonding NOT play a role? (Points : 3)

primary        secondary        tertiary        quaternary

 

 

Question 13.13. What is the pH of a solution in which [H3O]+ is 2.2 x 10-12 M? (Points : 3)

2.34        4.54 x 10-3        11.66        8.42

 

 

Question 14.14. What level of protein structure is not disturbed by denaturing? (Points : 3)

tertiary structure        primary structure        secondary structure        quaternary structure

 

 

Question 15.15. The pH of a 1.25 x 10-3 M NaOH solution is: (Points : 3)

2.90        7.00        11.1        3.10        10.9

 

 

Question 16.16. What is the concentration of [H3O+] in an aqueous solution when the [OH-] is 5.2 x 10-9 M? (Points : 3)

1.9 x 10-6 M        5.7 M        1.0 x 10-14 M        9.8 x 10-9 M

 

 

Question 17.17. The element found in the center of the heme prosthetic group is ___. (Points : 3)

iron        sulfur        nitrogen        carbon

 

 

Question 18.18. The Ka for the reaction of acetic acid and water shown below is 1.8 x 10-5.   Which of the following statements is true at pH 7? (Points : 3)

there is much more acetic acid than acetate ion        there is more acetate ion than acetic acid        the concentration of acetate ion is equal to that of acetic acid        the pH is lower than pKa of acetic acid

 

 

Question 19.19. Which of the following statements is true about alkanes? (Points : 3)

alkanes contain polar bonds        alkanes are attracted to one another by London forces        alkanes are polar molecules        alkanes are unsaturated hydrocarbons

 

 

Question 20.20. The structure of glycerophospholipids contains (Points : 3)

a phosphate group, glycerol, three fatty acids, and a sugar molecule.        a phosphate group, glycerol, two fatty acids, and an alcohol molecule.        a phosphate group, a cyclic carbon ring, and variable numbers of fatty acids.        a phosphate group, a carbohydrate molecule, an alcohol, and fatty acids.

 

 

Question 21.21.  Kw, the equilibrium constant for the ionization of water by the equation below, is 1.0 x 10-14. What does that mean when we are considering pure water?  (Points : 3)

More ions exist than water molecules.        The majority of the molecules present are in the form of H2O.        The amount of water is the same as the amount of the ions present.        There will always be more hydronium ions present than water at equilibrium.

 

 

Question 22.22. Carbon must form how many bonds? (Points : 3)

1        2        3        4

 

 

Question 23.23. What is the function of nonsteroidal anti-inflammatory drugs (NSAID)? (Points : 3)

To interrupt the production of prostaglandins from arachidonic acid.        To interfere with the production of anabolic steroids.        To facilitate the production of cyclooxygenase.        To stimulate the production of leukotrienes.

 

 

Question 24.24. You produce 500 mL of a 0.001 M HClO4, which ionizes completely in water. What is the pH you should expect? (Points : 3)

pH = 0.5        pH = 3.0        pH = 2.7        pH = 500

 

 

Question 25.25. The α-helix and β-pleated sheet are both forms of the ___ structure of proteins. (Points : 3)

primary        secondary        tertiary        quaternary

 

 

Question 26.26. The ethylammonium ion, CH3CH2NH3+ has a pKa of 10.81. It reacts with water to form ethylamine, CH3CH2NH2 and H3O+ as shown below. Which of the following statements is true at pH 7? (Points : 3)

ethylammonium ion predominates        ethylamine predominates        the concentration of ethylamine equals that of ethylammonium ion        the pH is higher than pKa of the ethylammonium ion

 

 

Question 27.27. Which of the following is the conjugate acid of the bicarbonate ion, HCO3-? (Points : 3)

H2CO3        CO32-        CO2        H3O+

 

 

Question 28.28. A solution in which the concentration of H+ is greater than the concentration of OH- will (Points : 3)

have a pH greater than 7.0 and be basic.        have a pH less than 7.0 and be basic.        have a pH greater than 7.0 and be acidic.        have a pH less than 7.0 and be acidic.

 

 

Question 29.29. Whenever an equilibrium constant, Keq, has a value greater than 1, which of the following statements is true at equilibrium? (Points : 3)

The concentration of reactants is greater than the concentration of the products.        The concentration of products is the same as the concentration of reactants.        The concentration of the products is greater than the concentration of the reactants.        Relative composition of reaction mixture cannot be predicted.

 

 

Question 30.30. The term commonly used for a chain of amino acids 100 units long is ___. (Points : 3)

peptide        oligopeptide        polypeptide        centapeptide

 

 

Question 31.31. Which material would be effective for neutralizing a minor acid spill? (Points : 3)

soap solution        vinegar solution        baking soda        household ammonia

 

 

Question 32.32. One characteristic of basic solution is that (Points : 3)

the solution would turn litmus red.        the solution would have a slippery feel to it.        the solution would have a sour taste.        the solution would dissolve some metals.

 

 

Question 33.33. Give the correct IUPAC name for the following molecule:  (Points : 3)

3, 4-Dimethylpentane        2,3-Dimethyl heptane        2,3-Dimethylpentane        1,1,2-Trimethylpentane

 

 

Question 34.34. A Ka can be calculated for some chemical reactions. The Ka is (Points : 3)

the Keq for the reaction to the right.        the Keq for the reaction to the left.        the Keq for the dissociation of an acid.        the pH of a very weak solution.

 

 

Question 35.35. The equation: has the following equilibrium constant expression. (Points : 3)

 

BioChemistry Test

 
"Looking for a Similar Assignment? Get Expert Help at an Amazing Discount!"

Anatomy And Physciology

/in /by

Anatomy And Physciology. Hello I need this case study done with her diagnosis  it at least 10 questions i need about her condition.

 

First Assigment:

Allison is a 32-year-old female with the following symptoms: dismal facial expression; droopy eyelids; swollen face and periorbital areas; thin, dry hair; dry, crusty skin; evidence of intellectual impairment; lethargy; a change of personality; bradycardia (59 b/min); blood pressure of 93/72; anemia (hematocrit 28); enlarged heart (upon radiological exam); constipation, and hypothermia. Plasma concentrations of total and free T4 and T3 include:

 

 

Second assignment:  I need these questions answered with at least 5 sentencess for each questions.

 

For the Week 1 Critical Thinking Exercise, you will answer the following questions using your critical thinking and reasoning skills:

1. In relation to homeostasis, explain why a person with toxic goiter tends to sweat profusely.

 

2. Explain how the action of a peptide hormone is similar to the action of the neurotransmitter norepinephrine.

Hello I need this case study done with her diagnosis  it at least 10 questions i need about her condition.

 

First Assigment:

Allison is a 32-year-old female with the following symptoms: dismal facial expression; droopy eyelids; swollen face and periorbital areas; thin, dry hair; dry, crusty skin; evidence of intellectual impairment; lethargy; a change of personality; bradycardia (59 b/min); blood pressure of 93/72; anemia (hematocrit 28); enlarged heart (upon radiological exam); constipation, and hypothermia. Plasma concentrations of total and free T4 and T3 include:

 

 

Second assignment:  I need these questions answered with at least 5 sentencess for each questions.

 

For the Week 1 Critical Thinking Exercise, you will answer the following questions using your critical thinking and reasoning skills:

1. In relation to homeostasis, explain why a person with toxic goiter tends to sweat profusely.

 

2. Explain how the action of a peptide hormone is similar to the action of the neurotransmitter norepinephrine.

 

Anatomy And Physciology

 
"Looking for a Similar Assignment? Get Expert Help at an Amazing Discount!"

Evolution And The Diversity Of Life (Introduction To Biology)

/in /by

Evolution And The Diversity Of Life (Introduction To Biology). Title of Essay: Evolution and Diversity of Life

 

For this essay examination, answer the following questions in one to two short paragraphs each. Type your answers in a Word file, and name the file with your name and the exam number.

1. Compare and contrast directional selection and disruptive selection, and provide an example of each.

2. Many pathogenic bacteria species are becoming resistant to antibiotics. Explain how such adaptations can develop through the process of natural selection. (Hint: Relate this example to the conditions that are necessary for natural selection to occur.)

3. What are the major evolutionary trends that developed among major vertebrate groups, specifically those that allowed for the transition from aquatic to terrestrial life?4. Providing examples, explain how sexual reproduction in plants has evolved to become less dependent on water.

No max word count needed.

Title of Essay: Evolution and Diversity of Life

 

For this essay examination, answer the following questions in one to two short paragraphs each. Type your answers in a Word file, and name the file with your name and the exam number.

1. Compare and contrast directional selection and disruptive selection, and provide an example of each.

2. Many pathogenic bacteria species are becoming resistant to antibiotics. Explain how such adaptations can develop through the process of natural selection. (Hint: Relate this example to the conditions that are necessary for natural selection to occur.)

3. What are the major evolutionary trends that developed among major vertebrate groups, specifically those that allowed for the transition from aquatic to terrestrial life?4. Providing examples, explain how sexual reproduction in plants has evolved to become less dependent on water.

No max word count needed.

Evolution And The Diversity Of Life (Introduction To Biology)

 
"Looking for a Similar Assignment? Get Expert Help at an Amazing Discount!"

Natural Selection and Guppy Evolution

/in /by

Natural Selection and Guppy Evolution.

Assignment: Natural Selection and Guppy Evolution

According to the theory of natural selection, organisms with traits that give them a greater chance of survival are more likely to pass these traits to offspring than organisms whose traits are not especially suited for survival. When Charles Darwin sailed on his 5-year-long voyage onboard the HMS Beagle, he recorded many observations of nature. Among these records, Darwin noted variations in beak shape and size among the finch populations throughout the Galápagos Islands.

Scientists who studied these beak variations realized the differences were not random, but related to the environment in which the finches lived. They discovered that finches tended to have beak types that made it easier for the birds to eat the foods growing in their particular environment (Belk & Maier, 2013). In what type of environment might finches with large, strong beaks have a greater chance of survival than finches with small, pointed beaks? Why might the finches with the smaller, pointed beaks be more likely to survive in a different type of environment?

Like Darwin and other scientists, biologist John Endler was interested in learning how environmental changes might influence the expression of advantageous traits in particular populations. Endler applied the principles of natural selection when he developed an experiment to study changes in guppy populations. He placed guppies in different environments and predicted how the fish populations would change in order to survive in those environments. For this week’s Assignment, you perform a virtual experiment based on John Endler’s experiment. Like Endler, you hypothesize how guppy populations will change to improve their chances of survival. You complete and submit a lab report for this Assignment.

To prepare for this Assignment:

  • Review Chapter 12 “An Evolving Enemy” and focus on the following:
    • What the theory of natural selection asserts
    • What evidence supports the theory of natural selection
    • How the theory of natural selection relates to the theory of evolution
  • Log on to MasteringBiology (see the Media section of the Required Resources) to review the animation “Principles of Evolution” and focus on the relationship between natural selection and evolution.

The Assignment:

By Day 5
  1. Print and save to your computer the Natural Selection Lab Report document from the Natural Selection Virtual Lab. You may complete this report by hand as you complete the lab; however, by Day 7, you submit an electronic version of this document for your Assignment.
  2. Complete the Natural Selection Virtual Lab. See the Required Resources section for the link to this activity.
    • Fill out appropriate sections of the Natural Selection Lab Report as you complete the lab. You may complete the analysis and conclusion sections of the lab report after you exit the virtual lab.

Questions about this Assignment? Post the questions in the Contact the Instructor area, so all class members may benefit from the Instructor’s response.

Refer to the Week 5 Assignment Rubric for grading details.

By Day 7

Following the instructions below, submit your Assignment. In order to receive full credit, all Assignments are due on time. Should you encounter an unanticipated and uncontrollable life event that may prevent you from meeting an Assignment deadline, contact the Instructor immediately to request an extension. Contact information for your Instructor can be found under the Contact the Instructor area. For a full description of the late policy, please refer to the “Policies on Late Assignments” section of your Syllabus.

Submission and Grading Information

To submit your completed Assignment for review and grading, do the following:

  • Please save your Assignment using the naming convention “WK5Assgn+last name+first initial.(extension)” as the name.
  • Click the Week 5 Assignment Rubric to review the Grading Criteria for the Assignment.
  • Click the Week 5 Assignment link. You will also be able to “View Rubric” for grading criteria from this area.
  • Next, from the Attach File area, click on the Browse My Computer button. Find the document you saved as “WK5Assgn+last name+first initial.(extension)” and click Open.
  • If applicable: From the Plagiarism Tools area, click the checkbox for I agree to submit my paper(s) to the Global Reference Database.
  • Click on the Submit button to complete your submission.

http://mym.cdn.laureate-media.com/2dett4d/Walden/BIOL/1001/CH/mm/virtual_lab_3/index.html

Natural Selection Lab Report

Name: ________________________

Date: _________________________

Updated 05/15/2014

Purpose: To apply the principles of natural selection to the effect of predation and background on the color patterns of male guppies over a period of 15 generations.

Natural Selection Virtual Lab Schedule

Note: You will complete the online Natural Selection Virtual Lab and this lab report in the following order:

1. Link to the online Natural Selection Virtual Lab and follow the lab instructions. Stop when the STOP sign appears in the virtual lab.

2. Complete Step 1 in the Results section of this lab report.

3. Complete the Hypothesis section of this lab report.

4. Return to the virtual lab and finish conducting the virtual experiment.

5. Record your observations from the virtual experiment by completing Step 2 in the Results section.

6. Complete the Analysis and Conclusion sections of this lab report.

7. Submit the finished lab report to your Instructor, following the submission instructions in your online classroom.

Hypothesis (5 points)

Note: Complete Step 1 in the Results section first. The observations you make there are ultimately part of the results and contribute to your hypothesis. Then, write your hypothesis (see instructions below).

In the table below, explain what you expect to observe in the color patterns of the male guppies in each of the ponds based on what you know about natural selection.

Pond 1 Prediction  
Pond 2 Prediction  
Pond 3 Prediction  
Pond 4 Prediction  

Note: After completing Step 1 in the Results section and writing your hypothesis, above, return to the Natural Selection Virtual Lab and select the NEXT button to complete the virtual experiment.

Materials and Methods

Before running this experiment you will create four different experimental ponds. The ponds will vary according to the kind of gravel (large, coarse gravel or small, fine gravel) and according to whether a guppy predator is present. In order to set up the experimental ponds you need to “drag and “drop” the correct sand size and the predators into the appropriate pond. You will then view a representative of a typical male guppy from a common pool and place a breeding population of these guppies in each of the experimental ponds. After approximately 15 guppy generations pass, the simulator will allow you to view a representative male guppy from each pond. You will observe and then record the male guppy color pattern representative of each pond in the results table and note any variations from the common ancestor.

Results (16 points)

Step 1:

a. Record your observations of the guppy color pattern before the start of the experiment in the table above. Describe a typical male guppy at the beginning of the experiment here:

b. Complete the Gravel Type and Predator columns in the table below.

Note: After completing Step 1, complete the Hypothesis section.

Step 2: After you select the TIME button in the interactive virtual experiment, record your observations of the changes in the color patterns of the guppies in the Observations Over Time column.

  Gravel Type

(coarse / fine)

 Predator

(yes / no)

 Observations Over Time.

Note the color pattern of typical male guppies in each pool and how they differ from that of their common ancestor.
Pond 1      
Pond 2      
Pond 3      
Pond 4      

Analysis (25 points)

Write a 3+ paragraph analysis of your results that includes the following:

· A summary of the observations of the changes in the guppy populations in each pond.

· A statement that explains whether you observed the results you expected, as well as why you did or did not observe the expected results.

· Explicitly describe the role of natural selection and the selection pressures present in this experiment.

· A statement explaining how, if at all, you think coloration in the male guppy populations in Ponds 1 and 2 would change over time if the predators were permanently removed (Note: Explain your hypothesis in terms of selection pressures.)

· A summary of the overall knowledge you gained from this lab

Conclusion (4 points)

Write a conclusion of one or more paragraphs that includes the following:

· A brief recap of the main points in your analysis

· Propose a question about this lab topic that you would like to research in the future

Natural Selection Lab Report – 1

© 2012 Laureate Education, Inc.

Natural Selection and Guppy Evolution

 
"Looking for a Similar Assignment? Get Expert Help at an Amazing Discount!"