Instead of oxygen________ may utilize nitrate or sulfate as their final electron acceptors

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


Ans: obligate anaerobes

Biology & Microbiology

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The Irish elk was misnamed because it was neither exclusively Irish, nor was it an elk. The

Irish elk is a giant extinct deer, the largest deer species ever, which stood up to 7 feet at the shoulder. In sexually mature males, the antlers spanned up to 12 feet and weighed 90 pounds. These large antlers were likely used in displays and ritual combat between males during the mating season. Although females preferred males with large antlers, these structures were also unwieldy and may have lead to decreased survivorship in males. Thus, this trait arose through the process of __________.

a. natural selection b. sexual selection c. mutation d. gene flow

Biology & Microbiology

The infinite variety of antibodies that can be generated by B cells is due to:

a. the infinite variety of genes in these cells b. the use of gene segments to produce an infinite variety of proteins c. the recombination of genes due to crossing over d. random mutations e. modifying the protein after an antigen is detected

Biology & Microbiology

A significant event influencing the rapid evolution of plants on land after their initial appearance was the ____

a. increase of atmospheric oxygen b. reduction of ultraviolet radiation penetration through the atmosphere c. stabilization of global climates d. increase in soil nutrients e. merging of land masses

Biology & Microbiology

Which of the following explains why archipelago

islands are so important to the study of allopatric speciation? a. All are islands surrounded by water. b. They are close to the equatorial continents. c. They are distant enough from the continents to prevent or impede gene flow. d. They prevent genetic isolation by putting all the populations into a small area. e. They increase genetic drift.

Biology & Microbiology