The shoot tip is indicated by
a. A.
b. B.
c. C.
d. D.
e. E.
Answer: a
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Cells of the pancreas produce and directly release enzymes to the digestive system. The type of secretory mechanism associated with the pancreatic cells is
A) transport secretion. B) regulated secretion. C) constitutive secretion. D) intracellular secretion. E) consistent secretion
In humans, the fluid immediately surrounding the embryo is contained in the _____
a. allantois b. placenta c. chorion d. amnion e. yolk sac
Most molecular biologists think that viruses originated from fragments of cellular nucleic acid. Which of the following observations supports this theory?
a) Viruses can reproduce only inside host cells. b) Viruses can infect both prokaryotic and eukaryotic cells. c) Viral genomes are usually similar to the genome of the host cell. d) Viruses contain either DNA or RNA. e) Viruses are enclosed in protein capsids rather than plasma membranes.
The central vacuoles of some plant cells you are studying fill with water and press the cell contents against their cell walls because of osmosis. What can you predict about the concentration of solutes in the solution that bathes the turgid plant cells?
A) The concentration of solutes outside the cell must be about the same as that of seawater. B) The concentration of solutes outside the cell must be significantly lower than the concentration within the cell. C) The concentration of solutes outside the cell must be significantly higher than the concentration within the cell. D) The concentration of solutes outside the cell can't be predicted, because it's the concentration inside the cell that's important. E) There must be no solutes either outside or inside the cell.