In mollusks, the folds of tissue that arise from the dorsal body wall and enclose a cavity surrounding the visceral mass are called the
A. lophophore.
B. foot.
C. nephridia.
D. mantle.
E. radula.
Answer: D
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Through a microscope, paired chromosomes are visible within the nuclei of an unidentified cell sample. Which statement about these cells is true?
a. They cells have been damaged by prolonged dehydration and are beginning to die. b. The cells must be prokaryotes because eukaryotic nuclei are opaque to visible light. c. The cells were preparing to undergo cell division when the slide was prepared. d. The cells were collected from a patient suffering from acute celiac disease.
Which of the following does NOT correctly describe antidiuretic hormone?
A. It regulates water turnover in the mammalian kidney. B. ADH secretion is stimulated by high blood osmolarity. C. It ultimately acts to reabsorb more water. D. It exerts it effects via the cAMP pathway. E. It does not involve the use of aquaporin molecules.
If you cut a stalk of celery and put it in a glass of water containing red food coloring overnight, the next morning the celery will be red. The food coloring was taken up through which of the following?
A. phloem B. stomata C. xylem D. dermal tissue E. ground tissue
Fossils have been discovered for about how many species?
A. 10,000 B. 50,000 C. 100,000 D. 150,000 E. 250,000