How does embryonic cleavage differ in protostomes and deuterostomes?
What will be an ideal response?
ANSWER: Many protostomes undergo determinant cleavage while many deuterostomes undergo
indeterminate cleavage. Therefore, in protostomes the fate of each cell’s developmental
fate is determined when the cell is produced and in deuterostomes the fate of each cell is
determined later in development.
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Indicate whether the statement is true or false
The various taxonomic levels (for example, phyla, genera, classes) of the hierarchical classification system differ from each other on the basis of _____
A) how widely the organisms assigned to each are distributed throughout the environment B) their inclusiveness C) the relative genome sizes of the organisms assigned to each D) morphological characters that are applicable to all organisms
Which of the following is typical of an endocrine gland?
A. It secretes into a duct. B. It produces enzymes for digestion. C. It usually secretes its products into the circulatory system. D. It increases the metabolic rate.
How does a longer alimentary canal (digestive tract) create an advantage in processing plant material?
a. Increased time of digestion allows for more processing. b. More volume means more food can be consumed. c. It creates positive feedback for decreased enzymatic activity.