The purpose of the sex pilus is to ____
a. connect bacterial cells so a cytoplasmic bridge can form for conjugation
b. form a gap junction between bacterial cells for conjugation
c. facilitate cytoplasmic exchange
d. enable bacteriophage infection
e. lyse the cell
ANSWER: a
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In this freshwater aquatic ecosystem, species composition varies along its length based on rock types, depth, oxygen
concentrations, and temperature.
a. streams b. lakes c. estuaries d. coral reefs e. hydrothermal vents
Some scientists predict that as atmospheric carbon dioxide levels increase, the pH of the oceans will drop, thus threatening coral and organisms within shells. What is the best explanation for this hypothesis?
A. Carbon dioxide combines with water to form a base. B. Carbon dioxide combines with water to form an acid. C. As the oceans warm, more water is evaporated, lowering the pH of the remaining water. D. As the pH of the ocean decreases, more carbon dioxide is released into the atmosphere. E. As the pH of the ocean increases, more carbon dioxide is released into the atmosphere.
In an organism with 52 chromosomes, how many bivalents would be expected to form during meiosis?
A) 208 B) 13 C) 26 D) 52 E) 104
Identify the role of oxygen in photosynthesis
A) It is split to form sugar. B) It is the final electron acceptor. C) It is a waste product in the light reactions. D) It is the initial electron releaser.