The oldest fossils look as though they were formed by organisms that resemble modern

a. sponges.
b. red algae.
c. jellyfish.
d. amebas.
e. prokaryotes.


E; The oldest fossils (3.8 billion years old) are very simple and are presumed to be heterotrophic prokaryotes. Fossil stomatolites dating from 3.6 billion years ago resemble deposits left by modern cyanobacteria, also prokaryotes. All the other choices list eukaryotic organisms, which appeared over a billion years later.

Biology & Microbiology

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_____ is the stimulus for phototropism

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What is the name of the area where bones meet and interact?

a. joint b. ligament c. osteoblast d. bony matrix e. connective tissue

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_______ is the study of how species interact with their environment.

a) ecology b) conservation biology c) demographics d) phylogeny

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Which of the following preventative measures is used to protect renal transplant patients from BK virus infection?

A. Injections of pooled human gamma globulin B. Prophylactic treatment with human leukocyte interferon C. Vaccination D. Prophylactic treatment with amantadine

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