What are the two different types of bone composition?
What will be an ideal response?
Answer: Compact and Spongy
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Following reports that stained chromosomes "disappeared" while observing cell division, scientists in the early 1900s determined the molecule of heredity to be
A) DNA. B) RNA. C) protein. D) lipids. E) carbohydrates.
Fresh water is much more dilute than the cells of a fish, so the animal constantly takes in water at its gills. How would a freshwater fish osmoregulate?
A. drink seawater and use active transport at the gills to take up salt from the water B. drink seawater and use active transport at the gills to get rid of excess salts C. produce dilute urine and use active transport at the gills to take up salt from the water D. produce dilute urine and use active transport at the gills to get rid of excess salt from the water E. drink saltwater and produce dilute urine to rid itself of excess salt
Which of the following are true of trash?
a. Cigarette filters can persist in the environment for 10 years. b. Components of a disposable diaper will persist for 100 years. c. A plastic bag can persist for 50 years. d. Many animals are killed by consuming trash each year. e. All of these are true.
Of all the functional groups, which of the following is classified as an amino group?
A. -SH B. -COOH C. -NH2 D. -OH E. -CHO