Which of the following experiments is the best way to determine if an element is essential for plant growth?
A) Measure the amount of the element stored in plant tissues.
B) Measure the amount of the element in the soil after plant growth.
C) Measure the weight of the plant and soil before and after plant growth.
D) Grow a plant using hydroponics with and without the element.
Answer: D
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Which of the following would be the best strategy to prevent the spread of yellow fever and dengue fever into the southern United States?
A) mosquito avoidance and eradication B) vaccination C) monitoring bird populations D) tick avoidance
In a flower, an anther is typically at the tip of a(n) ____
a. calyx b. receptacle c. carpel d. filament e. ovule
The three domain system arose when scientists grouped organisms according to how long they have been
a. alive in their present forms b. going extinct c. evolving independently d. using DNA to store information
Chloroplasts and mitochondria are thought to be of prokaryotic origin. One piece of evidence that supports this hypothesis is that these organelles contain prokaryotic-like ribosomes. These ribosomes are probably most similar to ribosomes found _______.
Fill in the blank(s) with the appropriate word(s).