Which of the following is NOT a potential reason anoxic methane-oxidizing Archaea have not also acquired the ability to reduce sulfate?
A) An individual electron acceptor such as sulfate is not always present where methane is.
B) Minimizing the metabolic requirements of the archaeon's genome size provides flexibility to interact with other reducing bacteria, such as nitrate reducers.
C) The archaeon-bacterium relationship yields more energy from methane oxidation/sulfate reduction when performed together than separately.
D) The methane-oxidizing Archaea will not easily acquire this metabolic capability from the bacterial partner.
Answer: C
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Choose the true statements about HOX and MADS box genes.
_____ They evolved after the divergence of plants and animals. _____ They encode transcription factors. _____ They influence the expression of other genes. _____ They influence the development of body plan in animals but do not function in plants.
What is the most likely way a mutation in one gene can convert one body part to another?
A) The mutated gene encodes a protein that affects the expression of many other genes. B) The mutated gene encodes a protein that determines cell shape. C) The mutation is in a structural gene and results in production of more protein than usual. D) A mutation in only one gene cannot convert one body part to another.
Sidney Brenner argued that the code was nonoverlapping because he considered that coding restrictions would occur if it were overlapping. A second major argument against an overlapping code involved the effect of a single nucleotide change
In an overlapping code, how many adjacent amino acids would be affected by a point mutation? In a nonoverlapping code, how many amino acid(s) would be affected?
An organ system is a group of organs that
a) work together to perform a specific function b) work together to perform all the functions in a multicellular organism c) are made up of similar cells d) are made up of similar tissues