The respiratory system is responsible for
A. oxygen entering the body and carbon dioxide leaving the body.
B. the regulation of nutrient absorption.
C. carbon dioxide entering the body and oxygen leaving the body.
D. nitrogen leaving the bloodstream.
E. methane formation.
Answer: A
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Thiobacillus species are acidophilic chemolithotrophs capable of autotrophic growth. They perform the dissimilative oxidation of H2S, So, thiosulfate, or Fe+2
Diagram or explain how Thiobacillus species obtain carbon and energy for growth and predict what type of environment they would be found in. What will be an ideal response?
Which statement best reflects the current understanding of pollen-tube elongation?
a. It is not even known if pollen tube growth uses chemical signals or is completely random. b. Pollen-tube elongation will occur as long as the pistil provides moisture and energy. c. While it is known that chemical cues from female tissues help guide pollen tube growth, the identity of these chemicals is not known. d. Nearly all of the details of the chemical interactions between the pollen tube and pistil tissue are known. e. Pollen-tube elongation will occur only when pistil chemical cues are suppressed.
Which of the following functions best explains the reason for the asymmetrically oriented structure of
the proteins in the cell membrane? a. These proteins are manufactured by free ribosomes. b. Each type of protein has its own function. c. These proteins pass through the ER membrane into the ER lumen. d. Enzymes are needed to modify the carbohydrate chains on these proteins. e. These proteins are initially formed by ribosomes on the rough ER.
One goal of conservation biology is to prevent extinction caused by
A) asteroid impacts. B) predation. C) human activity. D) interaction of native species. E) disease.