The depositions added to the inside of the primary plant cell wall _____.
A) are termed the secondary wall
B) are much stiffer and provide support for the plant
C) consist primarily of lignin
D) may eventually form water-conducting channels
E) all of the choices
Answer: E) all of the choices
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Your research project involves the characterization of a particular signal transduction pathway. Specifically, you have been studying a receptor tyrosine kinase and protein X, which initiates downstream events. You are certain that protein X is part of the signal transduction pathway, but have been unable to identify a direct protein-protein interaction between the receptor tyrosine kinase and the protein X. What should you do next in your attempt to identify a link between the receptor tyrosine kinase and protein X?
A. Try to identify proteins that act downstream of protein X. B. Try to identify a coactivator protein. C. Try to identify an adapter protein that can interact with both the receptor and protein X. D. Confirm the interaction between the receptor tyrosine kinase and its ligand.
Binary fission is the method by which bacteria
A) move to new locations. B) acquire genetic variation. C) reproduce. D) metabolize without oxygen. E) survive extreme conditions for long periods of time.
Features of the fungi as a group include which of the following?
A. Presence of chitin in the cell wall B. Presence of ergosterol in the cell membrane C. Reproduction by means of spores, either asexually or sexually D. All of the above are correct E. Heterotrophic nature
In human development, cell rearrangement within the ball of cells (morula) leads to a hollow sphere with a "mound" of cells at one pole. This group of cells is called the:
A. mesoderm. B. blastocyst. C. neural plate. D. inner cell mass. E. gastrula.