Strolling in the Sonoran Desert, you come upon a stately Saguaro cactus. The large central "trunks" of this cactus are covered with numerous smaller spines
The central stalks are modified _________ used for water storage and spines are modified ______ used for protection.
A) stems; leaves
B) leaves; leaves
C) petioles; leaf blades
D) leaf blades; trichomes
E) stems; fruits
Answer: A
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The eukaryotic cell organelle that most resembles a bacterial cell is the ________.
A. ribosome B. mitochondrion C. nucleus D. lysosome E. Golgi apparatus
White blood cells that engulf a microorganism and then explode their contents, creating a net that traps and kills
pathogens are known as ____.
a. neutrophils b. macrophages c. B lymphocytes d. dendritic cells e. eosinophils
Sound waves travel within the ear and cause hair cells of the organ of Corti to rub against the
__________, initiating nerve impulses to the brain. a. basement membrane b. basilar membrane c. tectorial membrane d. tympanic membrane e. plasma membrane
Which process occurs when a salamander regenerates a lost limb?
A) The homeotic genes of the regenerating limb are expressed. B) Certain cells in the limb dedifferentiate, divide, and then redifferentiate to form a new limb. C) A new salamander develops from the lost limb. D) The homeotic genes of the regenerating cells turn off.