Which trophic level forms the base of a food chain?

A. Tertiary consumers
B. Secondary consumers
C. Primary producers
D. Quaternary consumers
E. Primary consumers


Answer: C

Biology & Microbiology

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An average gram of forest soil contains about

A. 4 × 107 protists. B. 2 × 109 fungi. C. 4 × 107 bacteria and archaea. D. 2 × 109 bacteria and archaea.

Biology & Microbiology

Where are complement proteins synthesized, and what do they do?

a. in the bone marrow, generate new platelets and T-cells b. in the kidneys and plasma, destroy intracellular pathogens c. in macrophages and the liver, destroy extracellular pathogens d. in the spleen and duodenum, generate macrocytes

Biology & Microbiology

Adrenocorticotropic hormone targets the adrenal cortex to produce ___________

Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology

Which of the following statements is not one of Morgan's key ideas about independent assortment?

A. Crossing-over events during meiosis results in the exchange of genetic information between homologues. B. Alleles for different genes on the same chromosome are usually inherited together. C. The closer genes are to each other on the chromosome, the less likely a crossover will occur between them. D. Linked genes are always inherited together. E. All of these statements are part of Morgan's Theory of Independent Assortment.

Biology & Microbiology