Which of the two gases, oxygen or carbon dioxide, is present in the oceans in much greater proportions than in air? Why might this be the case?
What will be an ideal response?
Carbon dioxide is present in the oceans in much greater proportions than in air. This is because carbon dioxide selectively reacts with water to form carbonic acid, which, in turn, forms bicarbonate.
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Unicellular and simple multicellular organisms isolate and eliminate waste materials by:
A. moving the wastes into a contractile vacuole and eliminating them through exocytosis. B. filtering the wastes through specialized filters in the plasma membrane and into the extracellular space. C. secreting wastes into excretory tubules that connect to the outside of the cell. D. filtering the wastes into a collecting tubule and then selectively reabsorbing key solutes prior to excretion. E. All of the answer options are correct.
Summarize the metabolic process represented in the accompanying diagram
What will be an ideal response?
What is a major advantage of using a modifier screen as opposed to a primary screen?
A) Modifier screens can be used to identify pleiotropic genes. B) Modifier screens are easier to perform. C) Modifier screens use a random selection of flies based on their morphology and therefore should identify all genes involved in development. D) Modifier screens are performed with chemically mutagenized flies so all genes that affect development should be identified more rapidly than screening for spontaneous mutants.
Which of the following was a significant new challenge plants faced in moving to land that they had not faced in their aquatic environment?
a. predation b. desiccation c. the need for osmotic regulation d. light availability e. nutrient availability