Anton van Leeuwenhoek made an important contribution to the development of the cell theory. How?
a. He articulated the pattern component of the theory—that all organisms are made of cells.
b. He articulated the process component of the theory—that all cells come from preexisting cells.
c. He invented the first microscope and saw the first cell.
d. He invented more powerful microscopes and was the first to describe the diversity of cells.
Answer: d. He invented more powerful microscopes and was the first to describe the diversity of cells.
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Over several generations in a population, inbreeding tends to
A. decrease the relative proportions of homozygotes. B. decrease the likelihood of heterozygotes. C. stabilize the balance of genotypes predicted by the Hardy-Weinberg equilibrium. D. All of the choices are correct.
Ionizing radiation is emitted at low levels by many natural objects, including some rocks and gases
Indicate whether the statement is true or false
Which statement is false concerning carbohydrate fermentation media?
A. Positive carb fermentation is indicated by acid production B. Gas production occurs when a bubble forms in the inner tube C. Negative carb fermentation is indicated by acid production D. They can distinguish both carb fermentation and gas production
Arbuscular mycorrhizae are characterized by all of the following features, except which one?
A. Fungal hyphae penetrate plant root cells. B. They are the most common mycorrhizal type. C. The fungal component is a glomeromycete. D. The fungus can associate with several species of plants. E. They are seen in the earliest vascular plant fossils.