Carl Woese proposed the concept of the domain based on differences of which of the following cellular molecules?
A) transfer RNA
B) membrane lipids
C) ribosomal RNA
D) DNA
E) proteins
C
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Which organ is responsible for the cleanup of destroyed red blood cells?
a. spleen b. kidney c. bone marrow d. heart e. lungs
A laparoscope is used to guide the transfer of eggs into a woman’s oviduct in:
a. IUI. b. host mothering. c. in vitro fertilization. d. gamete intrafallopian transfer. e. zygote intrafallopian transfer
The giant kelp found along the Pacific coast is an example of
A) slime molds. B) phytoplankton. C) cyanobacteria. D) brown algae. E) water molds.
Why are ATPases associated with active transport proteins?
a. They allow for the production of ATP that is needed during active transport. b. They help pump phosphate ions across the membrane to maintain the electrochemical gradient. c. They provide transport proteins with the energy needed to pump molecules against their concentration gradients. d. They are important only in symport proteins, because two are required. e. All of the above