Loss of the cell wall is required for the endosymbiotic theory.
a. true
b. false
Ans: a. true
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Review the pedigree shown in Figure 17.7 and choose the most accurate statement about the inheritance of an X-linked recessive mutation
A. For rare X-linked traits, most of the affected individuals are males. B. Daughters of affected males are always affected. C. The offspring of an affected male are usually affected. D. The sons of the sisters of affected males will always be affected. E. The brothers of affected males are always affected.
Which of the following is(are) true regarding
whale sensory systems? a. Like fishes, they use lateral line systems for navigation. b. Their jaws pick up sound vibrations in the water and transmit them to their middle ears. c. They collect sound waves using external ears. d. All whales have auditory canals leading to their middle ears. e. All of these are true
In the Gram-staining procedure, the primary stain is ________.
A. crystal violet B. safranin C. iodine D. alcohol
Toxicants occurring in aquatic ecosystems are highly subjected to biological magnification, meaning the
A) pollutants take a long time to break down. B) pollutants occur in higher concentrations in tissues of organisms higher up the food chain. C) toxic chemicals specifically target primary producers, disrupting the entire food web. D) chemicals are converted to more toxic compounds once in the water. E) toxic chemicals accumulate in the upper (photic) zones of the water.