The structure that absorbs nutrients from the small intestines and delivers the nutrients in the blood to the liver is the
A. hepatic portal vein.
B. hepatic portal artery.
C. renal vein.
D. None of the choices are correct.
Answer: A
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Of the main types of cytoskeletal elements, which type is involved with helping stabilize the position of organelles within the cell and attaching a cell to adjacent cells?
a) microfilaments b) actin filaments c) myosin filaments d) microtubules e) intermediate filaments
Discuss the uncertainties and available evidence related to the evolutionary relationships among the
following algal protists: brown algae, golden algae, red algae, and green algae. Include in your discussion how they relate to the plants. What will be an ideal response?
Which statement best reflects the current understanding of pollen tube elongation?
a. It is not even known if pollen tube growth uses chemical signals or is completely random. b. Pollen tube elongation will occur as long as the pistil provides moisture and energy. c. While it is known that chemical cues from female tissues help guide pollen tube growth, the identity of these chemicals is not known. d. Nearly all of the details of the chemical interactions between the pollen tube and pistil tissue are known.
Apoptosis:
a. decreases the number of cells in the body b. is programmed cell death c. is a natural process d. All of these are correct.