Spiders and certain other arthropods which lack jaws or mandibles are placed in a subphylum called
A. blood suckers.
B. chelicerates.
C. Amandibulata.
D. mandibulates.
E. Agnathae.
Answer: B
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Answer the following statements true (T) or false (F)
1. Plasmids can help bacteria grow faster. 2. The ability to transfer DNA via conjugation is a universal feature of E. coli strains. 3. Transformation is the transfer of genes from dead bacteria to live bacteria. 4. It has been difficult to create an effective vaccine against HIV because reverse transcriptase cannot correct its errors. 5. Viral genomes must always be excised from the bacterial chromosome before viral components can be produced.
One adaptation to flight in birds is lighter bones, which lack
A. collagen. B. medullary cavities. C. calcium. D. the periosteum. E. bone marrow.
Atomic force microscopes use a scanning probe that maintains a fixed distance from the surface of the specimen. It is useful for specimens that
A. do not conduct electricity well. B. have extremely uneven surfaces. C. both do not conduct electricity well and have extremely uneven surfaces are correct. D. neither do not conduct electricity well nor have extremely uneven surfaces is correct.
Which of the following is evidence that the
continents are not static?
a. the jigsaw puzzle fit of continents like South America and Africa b. fossils occur in identical rock formations on both sides of the Atlantic Ocean c. magnetic poles of large rock formations point in different directions d. at certain places beneath the ocean, the sea floor is spreading e. all of these are evidence that the continents are not static