A polymer is a molecule assembled from subunit molecules called monomers into a chain by

polymerization bonds.



Indicate whether the statement is true or false.


F

Biology & Microbiology

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How could heavily fertilized lawns contribute to cyanobacterial blooms in lakes and oceans?

A. Run-off from the lawns will get into the water system, leading to large amounts of nitrogen that can be used by cyanobacteria in water systems. B. The large amounts of nutrient-rich grass that are created will be mowed down, with grass clipping bits eventually washing into sewer systems and into larger bodies of water. These grass clippings will serve as a nutrient source for cyanobacteria, leading to blooms. C. Large amounts of fertilizer will lead to excessive production of greenhouse gases (like CO2) from grass in lawns. Excessive CO2 production will lead to large blooms of cyanobacteria in water systems. D. They won't-the two systems are completely unrelated. How could grass in lawns contribute to effects in lakes and oceans?

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What is the main source of increasing greenhouse gases?

a. increased cell respiration b. increased use of fossil fuels c. increased diffusion from the oceans d. increased volcanic activity e. increased animal life on Earth

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The atom present in all organic compounds is

a. carbon. b. oxygen. c. nitrogen. d. sulfur. e. hydrogen.

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The __________ is a single layer of parenchyma cells that give rise to muticellular lateral roots

a. endodermis b. periderm c. cortex d. vascular cambium e. pericycle

Biology & Microbiology