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Questions in biology

[Open]The portion of the DNA molecule that can vary is its: A. sugar B. base C. deoxyribose D. ribose E. phosphate

[Open]Community interactions include: a. predation b. competition c. symbiosis d. all of the above

[Open]Why do erythrocytes swell and burst when placed in water? A. Since water concentration is higher outside the cell, water moves inward by passive diffusion. B. Since hemoglobin concentration is higher inside the cell, hemoglobin moves outward by exocytosis. C. Since potassium ions are more concentrated inside the cells, potassium ions move outward by osmosis. D. Erythrocytes pump water inward by active transport to balance osmotic gradients. E. Water is a universal solvent and simply dissolves the erythrocyte membranes.

[Open]At what point do scientists classify an area's weather as its climate? A. 1 year B. 5 years C. 15 years D. 30 years

[Open]A person sees a ball and kicks it, in part because of actions of the nervous system. Using the parts of the nervous system listed below, describe the path of nerve impulses that cause the person to see the ball: - Brain - Motor neurons - Sensory neurons - Spinal cord

[Open]Which of the following organisms feeds on the largest variety of producers? A. Herbivore B. Omnivore C. Carnivore D. Decomposer

[Open]What is adaptation in animals and plants?

[Open]What are the three main functions of roots?

[Open]A father with type B blood and a mother with type A blood have a child. Their child, while in a biology lab at school, tests her blood and discovers she has type O blood. Does she have any concerns about her parentage? A. Yes, because she should have type AB blood if they are her true biological parents. B. No, because type O blood is possible if her parents both had genotypes AB. C. No, because both of her parents could be heterozygous. D. Yes, because both of her parents might be heterozygous. E. No, because blood types A and B are codominant.

[Open]Two organisms that occupy many of the same niches are most likely A. mutualistic partners. B. predator–prey. C. host–parasite. D. competitors. E. commensalistic partners.