You are studying a protein that is shaped like a doughnut. The shape is a function of which level(s) of protein structure?
A) primary only
B) secondary only
C) tertiary only
D) secondary and tertiary only
E) primary, secondary, and tertiary
Answer: E
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The amount of water evaporated from the Earth's surface relative to the amount of water vapor transpired by plants is known as the ____
Fill in the blank with the appropriate word.
Tight junctions ____
a. seal the spaces between cells
b. allow ions and small molecules to pass between cells c. allow cells to communicate with each other d. give the cell its shape e. anchor the cell membrane to the cell wall
Which of the following is the correct sequence of events in cellular respiration?
A. glycolysis ? preparatory reaction ? citric acid cycle ? electron transport chain B. glycolysis ? citric acid cycle ? electron transport chain C. glycolysis ? electron transport chain ? preparatory reaction D. citric acid cycle ? glycolysis ? electron transport chain ? preparatory reaction E. citric acid cycle ? electron transport ? glycolysis ? preparatory reaction
Approximately 200 of the 300 native species of fish in Lake Victoria haven't been observed since the 1960s and are therefore probably extinct
Using the estimate of the background extinction rate, how many species of Lake Victoria fish would one expect to have naturally become extinct during the last 50 years? A) less than 1 B) 1-10 C) 11-50 D) more than 50