There have been experiments performed that simulate early Earth conditions. These experiments most
likely demonstrated that
a. DNA forms readily and reproduces itself.
b. many of the lipids, carbohydrates, proteins, and nucleotides required for life can form
under abiotic conditions.
c. complete, functioning prokaryotic cells are formed after approximately three months.
d. a lipid-protein film will eventually be formed by thermal convection.
e. oxygen was present in large amounts.
B
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A key feature of all viral infections is the
A. integration of viral DNA into host DNA. B. disintegration of host DNA. C. addition of a lipid membrane to the virus. D. separation of viral nucleic acid from the capsid.
During a human pregnancy, implantation occurs at which stage?
a. zygote b. early cleavage c. blastocyst d. gastrula e. morula
Draw a cladogram that for the following animals: sponges, cnidarians, flatworms, echinoderms,
chordates, molluscs, annelids, nematodes, and arthropods. On your cladogram indicate the points where the following evolved: 1) true tissues, 2) bilateral symmetry, 3) three germ layers, 4) segmentation, 5) protostome development, and 6) deuterostome development What will be an ideal response?
Genetically speaking, humans share roughly what percent of DNA sequences with gorillas?
a. 99% b. 98% c. 95% d. 90% e. 88%