A(n) ________ is an instrument used to separate subcellular structures and macromolecules on the basis of size, shape, and density. ________ developed this instrument in Sweden during the period 1925–1930
Fill in the blank with correct word.
Answer: ultracentrifuge; Theodor Svedberg
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Which of the following is not a characteristic that differentiates Bacteria from Archaea?
A. ester linkages in membrane lipids B. capable of chemoautotrophy C. ability to metabolize methane D. histones incorporated into chromosomes
Drugs like AZT, ddC, or ddI work against the AIDS virus because they
A) destroy viral proteins. B) look like hairpins to cause premature termination of viral mRNA. C) look like tRNAs and block viral translation. D) look like nitrogenous bases and block viral reverse transcriptase. E) prevent the virus from releasing its genome into the cytoplasm.
Which algae group has the largest multicellular forms?
A. red algae B. diatoms C. brown algae D. golden algae E. green algae
Compared to wetland mammals, water conservation in mammals of arid regions is enhanced by having more _____
A) juxtamedullary nephrons B) urinary bladders C) ureters D) podocytes