Which feature(s) differentiate(s) Actinobacteria from Firmicutes?
A) absence/presence of a cell wall
B) endospore production capability
C) motility and chemotaxis abilities
D) relative G+C content in their genomes
Answer: D
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The transfer of genetic material from two unrelated species is called ________
A. Vertical gene transfer B. Conjugation C. Sexual reproduction D. Binary fission E. Horizontal gene transfer
The World Health Organization (WHO) is part of the
A. Food and Drug Administration. B. Department of Health and Human Services. C. Department of Human Resources. D. United Nations. E. North Atlantic Treaty Organization (NATO).
Mutations in the gene for troponin can result in the production of the troponin protein, which has varying affinities for Ca2+ ions. Suppose that in a muscle cell a mutant troponin is expressed that has such a high affinity for Ca2+ ions that once they
bind to troponin they cannot unbind. What will likely happen in this muscle cell? A) Myosin heads will not bind to actin after action potentials stop being received. B) Myosin heads will bind to actin after action potentials stop being received. C) Tropomyosin will not move to expose myosin binding sites. D) Cross-bridges will form between myosin and tropomyosin.
Which of the following statements is true about micro-RNAs?
A) They are too small to be of any use to the cell. B) They bring amino acids to the ribosome. C) They regulate the amount of protein in a cell by interfering with mRNAs. D) Alternative splicing converts them into mRNAs.