Osmosis includes ________.
a. a semi-permeable membrane
b. transport proteins
c. both the diffusion of water and a semi-permeable membrane
d. the diffusion of water
Ans: c. both the diffusion of water and a semi-permeable membrane
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An —NH2 group is a(n) __________ group
a. carboxyl b. hydroxyl c. amine d. methyl e. carbonyl
Which of the following statements correctly describes one of Chargaff's rules regarding DNA?
A. The percentages of adenine and thymine are roughly equal, as are the percentages of guanine and cytosine in the DNA of a given species. B. DNA base composition does not vary between species. C. The percentages of adenine and cytosine are roughly equal, as are the percentages of guanine and thymine in the DNA of a given species. D. DNA has a double helical structure.
Answer the following questions true (T) or false (F)
1. The phenomenon known as species resistance is a highly specific defense against infectious agents. 2. Some toll-like receptors (TLRs) are found on the surface of host cells and recognize specific microbial molecules. 3. Innate immunity is not effective against fungus infections.
Hemophilia A is an X-linked recessive genetic condition. In humans it is due to a mutation in the F8 gene, which encodes a protein called coagulation factor VII. Coagulation factors are proteins important in blood clotting. Individuals with hemophilia, when injured, bleed longer than a normal, healthy individual; the inability to normally clot blood can be life threatening. Hemophilia is much more common in males than in females. Which of the following does NOT explain why this is so?
A. A female with one defective allele makes enough normal coagulation factor VII to clot blood and will not have hemophilia A. B. Females have to receive a defective allele from both their mother and their father to get hemophilia A. C. Males are hemizygous for the F8 gene, so they will have hemophilia A if they have one defective allele. D. Males have to receive a defective allele only from their father to get hemophilia A.