Sulfur occurs in all living matter primarily as a component of
A. fatty acids.
B. nucleotides.
C. amino acids.
D. carbohydrates
C. amino acids.
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Which of the following is not something that causes guard cells to close?
A. too little water in the leaf B. too much CO2 in the leaf C. presence of abscisic acid D. too little CO2 in the leaf E. too much water vapor outside the leaf
Research has shown that cytokinin levels fluctuate seasonally in temperate plants. What season would you expect to see the lowest levels of cytokinins and why would this be adaptive?
A. Spring, because lower levels of cytokinin allow auxin to promote rapid growth in stem height. This will allow the plant to compete effectively for sunlight. B. Summer, because lower levels of cytokinin would slow growth down and delay leaf aging. This will allow the plant to maximize the production of starch and increase it's sugar reserves. This will help ensure the plant's survival through Autumn and Winter. C. Autumn, because lower levels of cytokinin at this time of year will induce the production of ethylene. This will result in maturation of fruit and ensure effective seed dispersal before Winter. D. Winter, because lower levels of cytokinin will place buds into a dormant state. This will protect the underlying tissues from freezing until Spring. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about cytokinin levels and seasonality? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
In female mammals, most genes on one of the two X chromosomes are permanently inaccessible, and
this phenomenon is called __________. Fill in the blank(s) with the appropriate word(s).
Which of the following statements regarding the end of the first trimester is TRUE?
A. All major organ systems are in place by the end of the first trimester. B. The face appears embryonic. C. The fetus cannot yet be sexed. D. Secondary ossification centers are present. E. Significant subcutaneous fat is present.