Which model organism best represents the human genome?
a. Caenorhabditis elegans
b. Escherichia coli
c. Homo sapiens
d. Drosophila melanogaster
c. Homo sapiens
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Altering the three-dimensional structure of an enzyme might
A. change the amount of energy needed for a reaction. B. prevent the substrate from binding the enzyme's active site. C. change the type of substrate that binds the enzyme's active site. D. change the type of product produced in the reaction. E. allow the reaction to occur at a faster rate.
Each nucleotide in a strand of DNA is composed of a(n) ____________________, a(n) ____________________, and a(n) ____________________
Fill in the blank(s) with correct word
Which one of the following is TRUE regarding the flow of energy through an ecosystem?
A) Energy flows from the sun to consumers and then to producers. B) Energy flows in multiple directions through an ecosystem. C) Energy is cycled through an ecosystem and rarely lost as heat. D) Energy flows from the sun to producers and then to consumers. E) As energy flows through an ecosystem, it does not change form.
A scientist studying evolution of peppered moths (Biston betularia) in Michigan observed that the percentage of melanic moths increased by around 2% from 1960-1961. Has evolution occurred in this population?
A. No, because melanism wasn't adaptive at that time. B. Yes, because the frequency of melanic moths decreased. C. No, because the frequency of the melanic moths did not change enough to be considered evolution. D. Yes, because the frequency of the melanic moths in the population changed over time.