Suppose you use a dissecting microscope to observe organisms that have colonized discs of densely packed, fibrous wood (Masonite plates) that have been submerged in 6 inches of lake water for 8 weeks. You see insect cases (protective shelters), insect
larvae, and newly emerged insects with wings. You determine that you are looking at an insect species
A) that undergoes incomplete metamorphosis.
B) that undergoes complete metamorphosis.
C) with a body plan of radial symmetry.
D) with incomplete digestive tracts.
Answer: B
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The following factors may sometimes play a role in the movement of sap through xylem. Which one depends on the direct expenditure of ATP by the plant?
A) capillarity movement of water within the xylem B) evaporation of water from leaves C) cohesion among water molecules D) concentration of ions in the symplast E) bulk flow of water in the root apoplast
During the follicular phase of the menstrual cycle, a number of events occur which are listed below. Select the answer that places the events in the correct chronological order
Events: 1. the lining of the uterus thickens 2. granulosa cells secrete estradiol 3. FSH acts on granulosa cells 4. LH levels surge rapidly then decline 5. ovulation occurs A. 3, 2, 1, 4, 5 B. 3, 1, 2, 4, 5 C. 1, 2, 3, 4, 5 D. 2, 4, 3, 1, 5 E. 4, 3, 2, 1, 5
All EXCEPT which of the following are associated
with sclerenchyma? a. lignin b. photosynthesis c. transport d. sclereids e. fibers
Sarcomas are cancers of the ____
a. liver b. brain c. bone marrow d. muscle and bone e. lymphoid tissue