Which category of blood vessels will have the largest diameter?
a. Vein
b. Arteriole
c. Venule
d. Capillary
e. Artery
a
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Studies of the origin of life on Earth help us to consider what would be required for life elsewhere in the Universe. Which of the following is most likely to be true of extraterrestrial life?
A. Carbon will act as the backbone for organic molecules. B. Light from a nearby star will make photosynthesis possible. C. Oxygen will be used to convert energy in cells. D. Water will not be required to sustain life.
Each skeletal muscle cell constitutes a single
A. motor unit. B. muscle fiber. C. sarcolemma. D. myofibril. E. sarcomere.
Which process refers to dramatic phenotypic changes that sometimes occur in evolution, such as the appearance of
feathered wings during the evolution of birds? a. gradualism b. allopolyploidy c. macroevolution d. paedomorphosis e. microevolution
Which of the following attaches the target gene to a desired location?
a. DNA ligase b. Plasmids c. Restriction enzymes d. Chromosomal DNA