Answer the following statements true (T) or false (F)
1. A bacterial infection such as pneumonia is most likely caused by organisms derived from the animal kingdom.
2. All genetic mutations are harmful to an organism.
3. Vertical evolution, whereby living organisms evolve from a common ancestor ("tree of life"), is the only mechanism of evolution on Earth.
4. The effects of a genetic mutation are always limited to simply a change in DNA sequence with little consequence on the proteins expressed.
5. The proteome, rather than genome, is most directly responsible for the structure, function, and appearance of organisms.
1. F
2. F
3. F
4. F
5. F
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Desertification is mainly caused by ____
a. lack of rain b. poor agricultural practices c. too much precipitation d. deforestation e. erosion
Compare and contrast the structure, physical characteristics, and biological functions of two of the
following: fats, steroids, and phospholipids.What will be an ideal response?
Single-stranded ends generated by the same restriction enzyme are complementary to each other. They can be joined together
A. even when the source of the DNA is different. B. but the "sticky ends" will most likely have to be modified. C. but the hybridization of the two ends may cause a problem with cloning. D. only if the subunits have been methylated. E. only when the source of the DNA is the same.
People who have phenylketonuria, a genetic disorder, are unable to break down the amino acid phenylalanine so that it can be used in cellular respiration. Yet they need phenylalanine in their diet. Why do they need to eat some foods with phenylalanine?
A) Amino acids yield the most energy per gram, so they need phenylalanine to supply their cells with energy. B) Amino acids are used to build proteins and so they need enough phenylalanine for biosynthesis without any leftover that needs to be broken down to enter cellular respiration. C) Cellular respiration can use proteins more readily than other types of molecules, so the amino acid phenylalanine is essential.