The mitotic spindle is primarily composed of ____
a. actin
b. intermediate filaments
c. microtubules
d. keratin
e. motor proteins
C
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Over the winter your hibiscus plants were killed by cold winter temperatures. You are so annoyed that you ignore the garden; much to your surprise sunflowers sprout on their own
That second summer you see lots of goldfinches (small yellow birds) visit the garden to eat the sunflower seeds. Given that all abiotic conditions remained the same over the two years, why do you see hummingbirds the first year and goldfinches the second year? A. Communities depend on interactions among organisms. B. Communities depend on the physical environment. C. Disturbance can modify community composition. D. All of the responses are correct. E. More than one of the responses are correct.
Example: Respiration in Lakes
What will be an ideal response?
All enzymes are which type of organic molecule?
a. lipids b. minerals c. carbohydrates d. vitamins e. proteins
Which mass extinction led to the disappearance of the dinosaurs?
a. K–T mass extinction c. Triassic mass extinction b. Permian mass extinction d. Devonian mass extinction