The aminoglycosides and tetracycline specifically target the ________ interfering with ________.
A. cell membrane enzymes; transpeptidation step of peptidoglycan synthesis
B. tRNAs; protein synthesis
C. topoisomerases; DNA replication
D. 30s ribosomal subunit; protein synthesis
Answer: D
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Efforts to define the last universal common ancestor (LUCA) currently estimate 80–500 genes are shared by all known species. The lower value of 80 was estimated by determining the number of:
A. mRNAs species produced in LUCA. B. genes coded by LUCA genome. C. genes in simplest bacterial species. D. clearly identifiable orthologs in all organisms. E. genes required for processes that are found in all organisms.
Which of the following does NOT produce
variation? a. crossing over b. random alignment of chromosomes during meiosis c. asexual reproduction d. genetic recombination of alleles e. sexual reproduction
Which of the following is NOT and event of the ovarian cycle?
a) FSH promotes the development of a follicle b) the endometrium thickens c) the corpus luetum secretes progesterone d) ovulation of an egg occurs
A cell is expressing the mutant form of ras, but one of the downstream relay proteins is not present because of another mutation. How will cell division be affected in this scenario?
A) Cell division will decrease because the mutant form of ras decreases cell division. B) Cell division will increase because the mutant form of ras increases cell division. C) The cell will divide normally. D) The cell will not divide at all unless other proteins that stimulate cell division are present.