A bluish discoloration of the lips, nail beds and mucous membranes is

The world is made of only two countries, A and B, making two goods, S and T. Good S is capital intensive. The two countries’ endowments of labor and capital are given on the table below. Which is true?  

Suppose that a country experiences growth strongly biased toward its export, cloth.

Norway rats have 42 chromosomes in their diploid cells. If such a cell enters meiosis, how many chromosomes and double-helical molecules of DNA will be present in each daughter cell at the end of meiosis II?

A researcher injects a chemical that inhibits the enzyme Rubisco (ribulose bisphosphate carboxylase) into region “A” in the image above. The chemical is unable to diffuse across membrane “B”. What impact will the chemical have?

Refer to the figure below of a thylakoid to answer this question and the following two questions. Which of the following provides supporting evidence for the mechanism by which ATP is formed during the light reactions of photosynthesis? Screen Shot 2020-08-14 at 10.23.39 AM.png

Consider the following illustration of the “cell cycle”. How many chromatids would each chromosome consist of during the stage represented by the “?”? Screen Shot 2020-08-14 at 10.23.16 AM.png

An ant (Myrmecia pilosula) from Australia, named “bulldog” for its viciousness, has diploid cells that contain only two chromosomes. (Michael W.J. Crosland and Ross H. Crozier, “Myrmecia pilosula, an Ant with Only One Pair of Chromosomes,” Science 231:1278, 1986). Which of the following figures represents a cell during metaphase II of meiosis in Myrmecia pilosula? Screen Shot 2020-08-14 at 10.23.26 AM.png

The diagram below illustrates alcohol fermentation in yeast. Why do yeast produce alcohol (ethanol)? Screen Shot 2020-08-14 at 10.25.02 AM.png

Which of the following is true of the chromatids in cell #1 in the image of mitosis below? Screenshot 2023-10-16 at 11.17.16 AM.png