Richard is an avid gardener who spends a lot of time caring for the plants in his garden. To minimize damage from pests from his garden, Richard uses a pesticide spray. At first the spray is very effective and kills off most of the insects that he sees on his vegetable plants. However, after a few years of using the same pesticide he notices that some insects are surviving and continuing to eat his plants. This selection for herbicide resistance in the insects is an example of
What will be an ideal response?
natural selection
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A chromosome with the centromere located two-thirds of the distance from its end could be classified as
A. metacentric. B. submetacentric. C. acrocentric. D. telocentric. E. either submetacentric or acrocentric.
In higher plants, thylakoids are arranged into stacks called ____
a. stroma b. stomata c. photosystems d. grana e. stromal lamellae
Muscle that is not striated and is involuntary is ____
a. cardiac only b. skeletal only c. smooth only d. both cardiac and skeletal e. both cardiac and smooth
If a eukaryotic cell has 20 chromosomes and it undergoes meiosis, how many cells will result, and how many chromosomes will they contain?
A) 4 cells, each with 10 chromosomes B) 2 cells, each with 20 chromosomes C) 2 cells, each with 10 chromosomes D) 4 cells, each with 20 chromosomes