The discovery of Tiktaalik roseae was significant for which of the following reasons?
A. It provided evidence that terrestrial
vertebrates are descended from fish.
B. It provided evidence that birds and
dinosaurs are closely related.
C. It was the first fossil to be found with soft
parts preserved.
D. It provided evidence that the continents
were once linked together.
E. It was the first fossil from which DNA and
other macromolecules were successfully
extracted.
A
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The outcome of the process illustrated in Figure 26-2 is:
a. four new genetically identical cells that differ genetically from what they were before. b. four new but genetically distinct cells. c. two new genetically identical cells that differ genetically from what they were before. d. two new but genetically distinct cells. e. one male and one female cell.
Helicobacter pylori uses the enzyme urease to counteract a chemical defense in the human organ in which it lives. This chemical defense is
a. lysozyme. b. hydrochloric acid. c. superoxide radicals. d. sebum. e. complement.
Which step of the citric acid cycle requires both NAD+ and ADP as reactants?
A) step 1
B) step 2
C) step 3
D) step 4
What structure is produced during meiosis I in the male?
A. secondary spermatocyte B. spermatogonium C. primary oocyte D. immature sperm E. late spermatid