Which of the following controls the distribution of blood?
a. arteries
b. arterioles
c. capillaries
d. venules
e. veins
B
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Which of the following is the primary function of saprobic protists?
a. returning inorganic nutrients to the soil and water b. using carbon fixation to generate nutrition for organisms c. providing a protective environment for zooxanthellae d. facilitating reproduction by recombining genes
A tabacco plant can be made to express a gene from fireflies, resulting in the emission of light. Which of the following is the basis for this phenomenon?
A. Chloroplasts can be made to produce light if firefly proteins are injected into plant cells B. Fireflies and tobacco plants share a recent common ancestor C. Fireflies and tabacco plants are infected by the same kinds of bacteria D. Transcription and translation are fundamentally similar in both fireflies and tobacco plants E. Most enzymes in fireflies have the same amino acid sequence as the enzymes in tabacco plants
What is one adaptive advantage for deciduous plants that lose their leaves during the winter?
A) It prevents water loss from leaves when soil water is unavailable due to freezing. B) Production of new leaves each spring uses less energy than supporting old leaves all winter. C) If leaves are damaged by frost, the tree will die. D) A layer of leaves on the ground helps keep plant roots warm.
Microspore mother cells produce microspores. What do microspores then develop into?
A. Pollen grains B. Egg cells C. Synergids D. Megaspores E. Endosperm