A three-hectare lake in the American Midwest suddenly has succumbed to an algal bloom. What is the likely cause of eutrophication in freshwater ecosystems, such as this one?
A) increased solar radiation
B) introduction of non-native tertiary consumer fish
C) nutrient runoff
D) accidental introduction of a prolific culture of algae
E) iron dust blowing into the lake
Answer: C
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Transposable elements are considered to be "selfish" genes because they _____
A) have multiple promoters B) require multiple RNA polymerases for transcription C) reproduce without increasing the fitness of the host D) do not produce mRNA
Thomas Malthus proposed that
a. the food supply increased faster than the population. b. the population increased faster than the food supply. c. the food supply and population increased at the same rate. d. artificial selection was the key to evolution. e. natural selection was the key to evolution.
You have identified a novel cytoplasmic protein. Through sequence analysis you are able to identify the presence of a number of serine/threonine phosphorylation motifs. Based on these data, you hypothesize that this protein may be a substrate for what kind of enzyme?
A. A phospholipase B. A receptor tyrosine kinase C. A G protein-coupled receptor D. A protein kinase E. A tyrosine phosphatase
Both T3 and T4 are produced in the thyroid and are responsible for increasing the metabolic rate of specific organs in the body.
Answer the following statement true (T) or false (F)