What scientific concept did Charles Darwin and Alfred Wallace independently discover?

a) sexual reproduction
b) mutation
c) overbreeding
d) natural selection


Ans: d) natural selection

Biology & Microbiology

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Which vertebrates exhibits a "flow through" respiratory system?

A. mammals B. birds C. amphibians D. fishes E. birds and fishes

Biology & Microbiology

Which of the following is a difference between prokaryotes and eukaryotes?

a. In prokaryotes, the DNA is sequestered inside the nucleus; in eukaryotes, it is in the cytoplasm. b. In eukaryotes, transcription starts with a final copy of mRNA; in prokaryotes, there is pre-mRNA, and it must be edited to make the final transcript. c. In eukaryotes, translation only occurs after transcription; in prokaryotes, they happen simultaneously. d. In prokaryotes, there are exons and introns; in eukaryotes, there are neither of these.

Biology & Microbiology

Which of the following statements best describes the structure of a hemoglobin molecule?

A. Hemoglobin is comprised of three globin molecules and one heme group per hemoglobin molecule. B. Hemoglobin is comprised of four globin molecules, each with their own heme group that binds to and carries oxygen. C. Hemoglobin is comprised of four globin molecules, each of which contain millions of heme groups. D. Hemoglobin is comprised of two globin molecules, both with their own heme group that binds to and carries oxygen.

Biology & Microbiology

A rapidly growing recreation industry where people travel to visit unique biological communities is called ________

Fill in the blank(s) with correct word

Biology & Microbiology