Which of the following statements regarding plasmodesmata is false?
A) Plasmodesmata penetrate plant cell walls.
B) Plasmodesmata carry chemical messages between plant cells.
C) Plasmodesmata carry nutrients between plant cells.
D) Plasmodesmata are found in plants and animals.
Answer: D
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The transport of milk proteins from where they are made to outside the cell is brought about
by what system?
a. endomembrane b. cytoskeleton c. nuclei d. lysosome
In a long term study by the evolutionary biologists Endler and Reznick, they illustrated the effect of predation on life history traits by studying guppies with different predators: cichlids and killifish. The killifish preys mostly on immature, smaller guppies and cichlids pursue mature, larger guppies. They noticed that in river portions with only killifish, the guppies were larger than in
river portions with only cichlids. In an experiment, the researchers put the smaller guppies that had previously lived only with cichlids (which eat large guppies) in a river portion that only had killifish (which eat smaller ones). a. What did they observe over the course of eleven years? b. What do you predict would happen if they performed the opposite experiment and mixed guppies from killifish river portions to a river with only cichlids?
Randomly selecting samples of experimental units from an environment can result in
a. sampling error. b. blind testing. c. evidence. d. experimental design. e. consensus.
Explain why proteins were initially hypothesized to be the genetic material instead of DNA. What will be an ideal response?