Which muscle cells are designed for endurance?
A) slow-twitch cells
B) fast-twitch cells
C) myoglobin
D) hemoglobin
A
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The study of the crown gall tumor found
A. a bacterial plasmid promoter that was similar to plant promoters. B. an R plasmid. C. incorporation of the bacterial chromosome into the plant. D. incorporation of the plant chromosome into the bacteria.
In Drosophila melanogaster (2n = 8), a fly with seven chromosomes could be called a haplo-IV
Indicate whether the statement is true or false
If the bacterium Staphylococcus aureus experiences a cost for maintaining one or more antibiotic-resistance genes, what would happen in environments that lack antibiotics?
A) These genes would be maintained in case the antibiotics appear. B) These bacteria would be outcompeted and replaced by bacteria that have lost these genes. C) These bacteria would try to make the cost worthwhile by locating and migrating to microenvironments where traces of antibiotics are present. D) The number of genes conveying antibiotic resistance would increase in these bacteria.
The early explorers used sailing ships, which were blown by the major winds; therefore, Columbus and other sailors generally traveled from Europe to North America by the mid-latitude westerlies, and returned to Europe by the southern easterlies near the equator.
Answer the following statement true (T) or false (F)