The Thin Man HW

This is due on the first meeting next week: Tuesday for Li and Sr and Wednesday for K.

You can use any creative pose for your skeleton as long as it is anatomically-correct and inoffensive. 😉


STR 1 Pair SW/HW on Hypothesis Testing and Statistical Tests

Answer the following questions on a sheet of pad paper. Refer to the section on Hypothesis Testing and Statistical Tests in your STR manual or to any appropriate reference.

  1. What is a statistical hypothesis?
  2. Differentiate between a null and an alternative hypothesis.
  3. What is a test statistic?
  4. Differentiate between a one-tailed and a two-tailed test.
  5. Differentiate between a Type I error and a Type II error. Which is more acceptable in scientific research? Why? (Hint: Suppose the research is on the effectiveness of a certain leaf extract against pancreatic cancer. Would making a Type I or a Type II error do more harm?)
  6. What is meant by setting the level of significance at 0.05?
  7. Fill in the table showing the differences between the following statistical tests —
Statistical Test How many groups are being compared? What type of variables or measurements are taken? (nominal/ interval/ratio/ordinal) Brief description or example of situations in which the given test may be applied
t-test for independent samples




t-test for correlated samples




analysis of variance (ANOVA )




chi square




Friedman’s test




Excretion Pair SW/HW for Sr and K

Please answer on a sheet of pad paper. No need to copy the questions. You can use any reliable reference as long as you cite them. This will be collected next meeting. Thanks very much!
  1. Differentiate between osmoconformers and osmoregulators.
  2. What osmoregulatory adaptations do marine and freshwater fishes employ to enable them to survive in their habitats?
  3. Where do N-wastes come from? What are the 3 major types of N-wastes? Rank them in terms of toxicity, amount of water needed for excretion, and energy needed for synthesis. What kind of animal would excrete a given type of N-waste? Why?
  4. What are the osmoregulatory structures of the following animals: cnidarians, echinoderms, freshwater protists and sponges.
  5. Describe the 4 major process associated with excretory systems briefly?
  6. What are the excretory systems of the following animals: flatworms, roundworms, annelids, molluscs, crustaceans, insects, fishes and other vertebrates?
  7. Trace the flow of N-wastes in the human excretory system from its origin in the liver to its exit from the body as urine (name all the blood vessels and structures associated with the nephron).
  8. Describe the processes that occur in the glomerulus, proximal tubule, loop of Henle, distal tubule, and collecting duct.
  9. What is the importance of the difference in permeability to water and solutes of the cells in the walls of the Loop of Henle and collecting duct?
  10. ADH and RAAS both act on the nephrons, what is the difference between them?

Bio 2 HW for Li, Sr, and K

Here’s the  HW to facilitate our next lesson on thermoregulation as well the presentations I’ll be using for the excretory system and thermoregulation.

I’ve summarized the important concepts regarding thermoregulation onto this word file. This is also available at the first floor photocopier. Please read it and display your comprehension by creating a concept or a mind map of the ideas presented. Pictures, color-coded entries, stick figures, etc. are very welcome. Check out the Chem mind map on the right and the mind maps section of this page for some tips.  This is due on Friday for Li and Sr and Monday for K.