Which is the smallest unit of life that can exist as a
separate entity?
a. a cell
b. a molecule
c. an organ
d. a population
e. an ecosystem
Answer: a
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The individual credited with first observing the cell nucleus was ____
a. Anton van Leeuwenhoek b. Robert Brown c. Matthias Schleiden d. Theodor Schwann e. Rudolf Virchow
Which of the following is a characteristic of a K-selected species?
a. large but few offspring b. small but many offspring c. low parental care d. early self-sufficiency
All of the following are general characteristics of all animals except
a. diploid with haploid eggs and sperm. b. develop from an embryo. c. multicellular body. d. heterotrophic. e. possesion of nerves and muscles.
Which is NOT a correct characterization of tundra?
Select one: a. All precipitation in the tundra remains permanently frozen, hence the name "permafrost." b. The landscape of pools and mires in the tundra is due to melted snow that does not evaporate. c. The long periods of darkness, sometimes even six months of night, prevents trees and other photosynthetic producers from growing. d. In the summer, the tundra is alive with insects and birds. e. Most animals found in the tundra live there year round.