Define partial pressure of a gas | Quick Homework Help

  1. Define partial pressure of a gas. Identify 3 different units used to measure partial pressure.
  2. Define torr.
  3. What is the PO2 of the atmosphere at sea level? Express in units of torr.
  4. Define respiratory pigment and heme.
  5. Name the respiratory pigment found in vertebrates and the respiratory pigment common in decapod crustaceans. Identify the metal ion associated with the porphyrin rings of each respiratory pigmennt
  6. How many subunits does vertebrate Hb have and what are they named? 
  7. To what part of the Hb molecule does O2 bind? How many oxygen binding sites does each Hb molecule have?
  8. If a solution contains 1 x 106 Hb molecules, how many O2 binding sites are available? If the solution of Hb is 50% saturated with O2, how many binding sites are occupied by O2? If the Hb solution is 23% saturated with O2, how many binding sites are occupied by O2?
  9. A solution of Hb is 98% saturated with O2 when the partial pressure of O2 is 100 mm Hg. What is the partial pressure of O2 in units of kPa?

Deer mice (Peromyscus maniculatus) have structurally different forms of Hb, depending upon whether they live at high or low altitude. A group of researchers collected deer mice from high and low altitude populations and drew blood from the mice. The oxygen binding properties of Hb from high altitude-dwelling and low altitude-dwelling mice were compared at 37°C and pH 7.4. Data from this comparison are given in the table below.
Using the data in the table below, draw a graph showing how the saturation of Hb binding sites changes as the partial pressure of oxygen changes. Points for Hb-B1 and Hb-B2 should be plotted on the same graph. – – in the table indicates no data were collected at that PO2 for that type of Hb.

Don't use plagiarized sources. Get Your Custom Essay on
Define partial pressure of a gas | Quick Homework Help
Get an essay WRITTEN FOR YOU, Plagiarism free, and by an EXPERT!
Order Essay

PO2 (torr)

Percent saturation of Hb-B1

Percent saturation of Hb-B2


















  1. Which is the independent variable in this case?
  2. Use your graph to estimate the PO2 at which Hb-B1 is 50% saturated with O2 (P50) and the PO2 at which Hb-B2 is 50% saturated with O2.
  3. Define affinity of a molecule for a ligand.
  4. Using your answer to question 12, which type of Hb has higher oxygen affinity?
  5. Which form of Hb would you expect to find in deer mice living at high altitude where the PO2 of the atmosphere is less?  
  6. Which form of deer mouse Hb releases O2 more easily when blood circulates to body tissues?
  7. The amino acid sequence of the ?-globin subunits of Hb-B1 and Hb-B2 is different at four positions:  the 62nd, 72nd, 128th, and 135th amino acids differ between Hb-B1 and Hb-B2.  All the other amino acids are the same between the two types of Hb.  Explain how a difference in amino acid sequence could change function of the entire Hb molecule.
  8. Use Figure 34.25a in Campbell Biology in Focus to estimate P50 of adult human Hb.  Notice the units on this graph.  Determine whether a conversion factor is necessary to convert to the same units as your deer mouse graph.  Which type of Hb has a higher affinity for O2, deer mouse Hb-B1 or human Hb?

Quick Homework Essays
Calculate your paper price
Pages (550 words)
Approximate price: -

Why Work with Us

Top Quality and Well-Researched Papers

We always make sure that writers follow all your instructions precisely. You can choose your academic level: high school, college/university or professional, and we will assign a writer who has a respective degree.

Professional and Experienced Academic Writers

We have a team of professional writers with experience in academic and business writing. Many are native speakers and able to perform any task for which you need help.

Free Unlimited Revisions

If you think we missed something, send your order for a free revision. You have 10 days to submit the order for review after you have received the final document. You can do this yourself after logging into your personal account or by contacting our support.

Prompt Delivery and 100% Money-Back-Guarantee

All papers are always delivered on time. In case we need more time to master your paper, we may contact you regarding the deadline extension. In case you cannot provide us with more time, a 100% refund is guaranteed.

Original & Confidential

We use several writing tools checks to ensure that all documents you receive are free from plagiarism. Our editors carefully review all quotations in the text. We also promise maximum confidentiality in all of our services.

24/7 Customer Support

Our support agents are available 24 hours a day 7 days a week and committed to providing you with the best customer experience. Get in touch whenever you need any assistance.

Try it now!

Calculate the price of your order

Total price:

How it works?

Follow these simple steps to get your paper done

Place your order

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Receive the final file

Once your paper is ready, we will email it to you.

Our Services

No need to work on your paper at night. Sleep tight, we will cover your back. We offer all kinds of writing services.


Essay Writing Service

No matter what kind of academic paper you need and how urgent you need it, you are welcome to choose your academic level and the type of your paper at an affordable price. We take care of all your paper needs and give a 24/7 customer care support system.


Admission Essays & Business Writing Help

An admission essay is an essay or other written statement by a candidate, often a potential student enrolling in a college, university, or graduate school. You can be rest assurred that through our service we will write the best admission essay for you.


Editing Support

Our academic writers and editors make the necessary changes to your paper so that it is polished. We also format your document by correctly quoting the sources and creating reference lists in the formats APA, Harvard, MLA, Chicago / Turabian.


Revision Support

If you think your paper could be improved, you can request a review. In this case, your paper will be checked by the writer or assigned to an editor. You can use this option as many times as you see fit. This is free because we want you to be completely satisfied with the service offered.