In the annual rings of woody trees, how does the cell size within the xylem of the spring and summer wood compare to the fall and winter wood?
A. It is more dense.
B. It is younger.
C. The cells are larger.
D. It has smaller vessels.
E. The cell walls are thicker.
Answer: C
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The following is a list of events involved in the activation of a cell by a steroid hormone. Which one of the following answers best represents the order in which the steps occur?
1. cellular response to the hormone 2. activation of a gene 3. formation of a hormone-receptor complex 4. diffusion of the hormone through a target cell membrane 5. production of a protein A) 4, 3, 2, 5, 1 B) 2, 5, 4, 3, 1 C) 5, 3, 4, 1, 2 D) 2, 5, 1, 3, 4 E) 4, 3, 2, 1, 5
In your body, when energy is released from the breakdown of a molecule such as glucose:
a) some of it may be harnessed by building the unstable high-energy bonds that attach phosphate groups to ATP. b) molecules of ATP are required to capture the heat generated by the reaction. c) adenosine diphosphate is created. d) all of the energy is lost as enthalpy. e) None of the above is correct.
The optimum reaction rate of a particular enzyme occurs at pH 7.3 at 37°C. This reaction would probably proceed faster by
A) increasing the temperature to 38°C and keeping the pH at 7.3. B) increasing the pH and maintaining the temperature at 37°C. C) decreasing the pH and increasing the temperature. D) increasing both temperature and pH.
Which cell structure is correctly paired with its primary function?
A. ribosome - protein synthesis B. mitochondrion - movement C. vacuole - cell division D. nucleus - storage of nutrients