__________ are one of the few eukaryotic cells that can function without nuclei
a. Sieve tube elements
b. Companion cells
c. Tracheids
d. Sclereids
e. Vessel elements
A
You might also like to view...
Organisms that can grow in habitats with low water activity by maintaining a high internal salt concentration are called ________ organisms.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements is false?
A. Suspension filter feeding animals are all herbivores. B. The largest baleen whales are suspension filter feeders. C. Suspension filter feeding animals are found in both marine and freshwater environments. D. The similar feeding strategies of scallops and whales are an example of convergent evolution. E. None of these statements is false.
Which statement is true?
a. The ratio of carbon dioxide produced to oxygen consumed is greater than one in healthy adults. b. The partial pressure of oxygen in the lungs is greatest just before exhalation. c. The partial pressure of carbon dioxide is greatest in venous blood. d. Partial pressures are the measurement of Hg displacement in the lungs.
The adrenal hormone, aldosterone, regulates kidney function by
A. triggering a sensation of thirst. B. increasing the permeability of the collecting duct to urea. C. stimulating active reabsorption of sodium, decreasing its excretion. D. increasing the permeability of the collecting duct to salt. E. reducing the blood flow to the kidney.