Many crustaceans (for example, lobsters, shrimp, and crayfish) use their tails to swim, but crabs have reduced tails that curl under their shells and are not used in swimming. This is an example of _____

A) convergent evolution
B) a homologous structure
C) natural selection
D) a vestigial trait


Answer: D

Biology & Microbiology

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Postranscriptional modification to remove introns is needed for the bacterial RNA that has codon, rather than anticodon, sequences.

Answer the following statement true (T) or false (F)

Biology & Microbiology

One of the important assumptions made during the study of heritability in twins is that monozygotic twins share all their ____________________ and their ____________________

Fill in the blank(s) with correct word

Biology & Microbiology

Elements that are required in relatively large amounts by microorganisms are called

A. macronutrients. B. meganutrients. C. multivitamins. D. macromolecules.

Biology & Microbiology

A person peddling a bicycle is an example of which of the following?

a. potential energy b. chemical energy c. kinetic energy d. light energy

Biology & Microbiology