The key differences between cell types that allows them to be differentiated from one another are ________, the result of
A. the rate of gene expression in different cell types; varying density of RNA polymerase to produce more mRNA in some cells than others.
B. the amount of protein present in different cell types; varying density of ribosomes to produce more polypeptides in some cells than others.
C. the proteins being produced in each cell type; transcription factors regulating which genes are expressed and their level of expression.
D. the DNA present in the nucleus of each cell type; differential sorting of chromosomes during mitosis when the cells are dividing.
Answer: C
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Kinesis is
A. a movement toward a stimulus. B. a movement away from a stimulus. C. any movement in response to a stimulus, but not necessarily toward or away. D. a movement. E. any movement away from an object.
The defining characteristic(s) of the root cap is that it
A. protects the meristem from abrasion. B. is located at the tip of the root. C. secretes a lubricant for the growing root. D. plays a role in sensing gravity. E. All of the answer choices are correct.
Which of the following statements is TRUE regarding the light reactions?
A) Without water, the system would shut down. B) ATP and NADPH are needed. C) They rely on energy provided by glucose synthesis. D) Without photosystem I, photosystem II could not occur. E) Oxygen is required.
Microcosms
What will be an ideal response?