The combustion of fossil fuels, such as coal, oil, and gas, have contributed to the steady increase in atmosphere CO2 gas over the last 25 years.
Answer the following statement true (T) or false (F)
True
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Concerning catabolism and anabolism,
A. they refer to reactions solely dealing with the metabolism of lipids. B. the intermediates of one serve as the reactants in the other. C. the energy gathered in one is utilized in the other. D. they refer solely to the reactions involved in synthesis of carbohydrates. E. the intermediates of one serve as the reactants in the other AND the energy gathered in one is utilized in the other.
This animal lacks symmetry, has no embryonic
tissues, and has intracellular digestion. It is ___.
a. a cnidarian b. a flatworm c. a sponge d. an annelid e. more than one of these
Which of the following choices best describes the genetic engineering used to prevent rejection of xenotransplants?
1.Transgenic pigs carrying human genes donate organs to patients who also receive bone marrow transplants from the donor pig. 2.Hyperacute rejection of MHC proteins from animal donors is prevented by the use of cloned animal tissues lacking MHC markers. 3.Transgenic pigs carrying human genes donate organs to patients who also receive bone marrow transplants from the donor pig, resulting in chimeric immune systems. 4.A bone marrow transplant from the human patient to the donor pig affects MHC proteins on the pig organs, reducing the severity of xenotransplant rejection.
Which of the following is NOT true about the discovery of DNA structure by Watson and Crick?
a. From the structure of DNA, it was clear how genes encoded information for proteins. b. Determining the structure of DNA almost immediately revealed how chromosomes duplicate. c. X-ray pictures of DNA were helpful in deducing its structure. d. Hydrogen bonds were shown to hold the two strands of DNA together. e. Because of base pairing, there always is an equal number of G and C, and A and T.