Australopithecis anamensisis a good direct ancestor for Australopithecus afarensis

a. true
b. false


Answer: a. true

Biology & Microbiology

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In a set of classic experiments performed in the early 1950s, Urey and Miller subjected an experimental system composed of H2, CH4 (methane), and NH4 (ammonia) to electrical sparks. A few days later, they found ________________ in their system.

a. cells b. rRNA c. DNA d. tRNA e. amino acids

Biology & Microbiology

Tobacco mosaic virus can be transmitted between individual plants by biting insects.

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

Biology & Microbiology

A serous membrane lines a body cavity that opens to the outside of the body

____________________ Indicate whether the statement is true or false.

Biology & Microbiology

Which of the following is a difference between electronegative and electropositive atoms?

A. Electronegative atoms tend to lose electrons. B. Electropositive atoms tend to gain electrons. C. Because oxygen (O) is strongly electropositive it will have a partial positive charge in H2O. D. Because hydrogen (H) is strongly electronegative it will have a partial negative charge in H2O. E. As atomic radii decrease, atoms tend to become more electronegative.

Biology & Microbiology