Approximately ________ million years ago the amniotes branched off from their amphibian ancestor
a. 300
b. 250
c. 355
d. 180
e. 425
a
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One reason organic farming is used is because in contrast to other farming methods certain inorganic fertilizers may be easily:
A. leached from soils B. bound by soil particles C. not useful as minerals at all D. lack the essential minerals needed for plant growth E. too high acid content
The tertiary structure of a protein is ____
a. the amino acid sequence in a polypeptide chain b. generated by the formation of bonds between amino acids c. formed by a protein region folding on itself d. formed by the interaction of two or more polypeptide chain e. generated by bonding and folding of ribosomes attached to the endoplasmic reticulum
Huntington Disease is inherited in humans as an autosomal dominant gene. Affected individuals show progressive brain deterioration from cell death in the cerebral cortex. Onset of the disease usually occurs between ages 30 and 50
Give two possible reasons for the observed variation in the age of onset of this disease.
Darwin was the first person to draw an evolutionary tree, a diagram that represents
A) records of breeding in domesticated animals. B) records of lineages in humans (also known as a family tree). C) evidence-based hypotheses regarding our understanding of patterns of evolutionary descent. D) groupings of organisms based on overall similarity.