Angiosperms are the most successful terrestrial plants. Which of the following features is unique to them and helps account for their success?
A) wind pollination
B) dominant gametophytes
C) fruits enclosing seeds
D) embryos enclosed within seed coats
E) sperm cells without flagella
Answer: C
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The significance of Fred Griffith's experiment in which he used two strains of Streptococcus pneumoniae is that
a. the semiconservative nature of DNA replication was finally demonstrated. b. it demonstrated that harmless bacterial cells had become permanently transformed through a change in the bacterial hereditary system. c. it confirmed that each cell of a given species contains the same amount of DNA. d. it demonstrated that radioactively labeled bacteriophages transfer their DNA but not their protein coats to their host bacteria. e. it demonstrated that mice can change the hereditary content of bacteria.
Which of the following is not a function of the liver in adults?
A) produces bile B) detoxifies alcohol C) stores glucose D) produces urea E) makes red blood cells
What is the major lipid found in membranes?
A. cholesterol B. phospholipids C. steroids D. saturated fatty acids E. triglycerides
As the electron transport carriers shuttle electrons, they actively pump ________ into the outer membrane compartment setting up a concentration gradient called the proton motive force.
A. ATP B. phosphate C. NADH D. oxygen E. hydrogen ions