A mutation is
A) a change in a DNA sequence that affects at least 90 percent of individuals in a population.
B) a change in a DNA sequence that is rare in a population.
C) a change in a DNA sequence that harms health.
D) a type of radiation that can alter the genetic code.
B) a change in a DNA sequence that is rare in a population.
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Which conclusion can be drawn from Gause's experiments on interspecific competition between two species of
Paramecium that are cultured together and feed on the same resource?
a. Both populations of Paramecium expire due to a build-up of waste products. b. One population of Paramecium used the other as a food source. c. Paramecium populations survive well together because they have no limiting resources. d. When two populations of Paramecium use the same limiting resource, they can coexist long term. e. When two populations of Paramecium use the same limiting resource, they cannot coexist long term.
Which of the following supports a detrital food web?
a. dead or decaying organisms b. photosynthetic organisms c. living autotrophs d. phytoplankton
Which statement is not true?
1.Erythrocytes are involved in the defense response. 2.Erythrocytes are the most abundant in the human body. 3.Erythrocytes are different than the neutrophils, lymphocytes, eosinophils, and monocytes. 4.Hemoglobin contains the element iron.
What is the role of gyrase in transcription?
a. It assists in the formation of termination hairpin structures. b. It melts the DNA duplex to form the transcription bubble. c. It removes the positive supercoils generated ahead of RNA polymerase. d. It breaks the hydrogen bonds between DNA and RNA during transcription termination. e. It removes the negative supercoils generated behind RNA polymerase.