In many species, there are two representatives of each chromosome. In such species, the characteristic number of chromosomes is called the ________ number. It is usually symbolized as ________
A) haploid; 2n
B) monoploid; n
C) diploid; n
D) haploid; n
E) diploid; 2n
Answer: E
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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 represents the correct ordering of events that occur during the catabolism of glucose in the absence of O2
-glycolysis; Krebs cycle; oxidative phosphorylation -glycolysis; oxidative phosphorylation; Krebs cycle -oxidative phosphorylation; Krebs cycle; glycolysis -glycolysis; fermentation -Krebs cycle; fermentation
An organism that invests energy primarily in growth, likely lives in
a. an aquatic environment b. a terrestrial environment c. a safe environment d. a risky environment e. I don't know the answer
Carl Woese proposed the concept of the domain based on differences of which of the following cellular molecules?
A. transfer RNA B. membrane lipids C. ribosomal RNA D. DNA E. proteins