Which statement about skeletal muscle fibers is true?
A) Each muscle fiber is composed of many cells.
B) Each muscle fiber is composed of globular proteins.
C) Each muscle fiber contains one sarcomere.
D) Each muscle fiber contains actin and myosin.
Answer: D
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Recently a methanotrophic proteobacterium was reported that oxidizes methane in anoxic environments by coupling methanotrophy with nitrite reduction, known as ________. In this process of reducing nitrite (NO2-) to nitrogen gas (N2), molecular oxygen is released within the microbe, which it harnesses for methane oxidation.
Fill in the blank(s) with the appropriate word(s).
At the genetic level, evolution is
A. a change in fitness over time. B. a population change over time. C. a change in the frequency of an allele or genotype over time. D. an increase in fitness over time. E. natural selection.
Much of the control of the digestive system originates in the neuron networks of the submucosa
Indicate whether the statement is true or false.
Homologous recombination ________
A) occurs during meiosis as a normal process B) is used in plant cell activation C) must be used to produce animal bioreactors D) occurs when creating a knockout animal E) is a technique not proven to be successful