Identify the nitrogenous bases and pentose sugars in DNA and RNA
What will be an ideal response?
DNA has deoxyribose as the sugar in its nucleotides. The purines that are found in DNA are adenine and guanine, and the pyrimidines found in DNA are thymine and cytosine. RNA has ribose as the sugar in its nucleotides. The purines that are found in RNA are adenine and guanine, and the pyrimidines found in RNA are uracil and cytosine.
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A severe disease that is inherited as an autosomal recessive trait is more likely to skip generations in a pedigree than an autosomal recessive trait that causes a harmless phenotypic variant because
A) a person with the harmless variant is less likely to reproduce than a person with the disease. B) a person with an autosomal recessive disease is less likely to be well enough to reproduce than a person with a harmless trait variant. C) all inborn errors of metabolism are dominant. D) a family with an autosomal recessive disease is usually much smaller than a family with an autosomal recessive harmless trait variant.
The ozone layer of Earth's atmosphere helps to filter ultraviolet radiation. As the ozone layer is depleted, more ultraviolet radiation reaches Earth's surface. This increase in ultraviolet radiation may be harmful because it can directly cause
a) photosynthesis to stop in all marine organisms b) tissue damage c) increased cooling of the atmosphere d) abnormal migration patterns in waterfowl
Although diversity of communities is affected by processes acting on the local level, it is also directly related to regional rates of species production and immigration.
a. true b. false
Choose the statement that is correct about the frequency of mitosis
A) Some cells, such as leaf cells, cease to divide after mature size is reached. B) All cells divide throughout the existence of a multicellular eukaryote. C) Brain cells are easy to replace because they divide frequently after maturity. D) Bone marrow cells are an example of cells that cease to divide after maturity.