_______________ allow for bacterial cells to sense a chemical gradient and respond appropriately.
A) Osmoreceptors
B) Photoreceptors
C) Aeroreceptors
D) Chemoreceptors
Ans: D) Chemoreceptors
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A bloodstream infection with ____________________ could result in the release of endotoxin into the bloodstream.
A) Clostridium difficile or Clostridium perfringens B) Neisseria gonorrhoeae or Escherichia coli C) Staphylococcus aureus or Mycobacterium tuberculosis D) Staphylococcus aureus or Streptococcus pyogenes
The organ that performs filtration of blood, reabsorption, and secretion in vertebrates is the _______.
A. small intestine B. pancreas C. liver D. kidney E. large intestine
The primary function of DNA ligase is to
a. cut the two strands of the DNA molecule prior to replication. b. attach free nucleotides to the growing chain. c. remove bases that might be inserted incorrectly. d. seal new short stretches of nucleotides into one continuous strand. e. fragment old DNA that is no longer of use to the cell.
Hybridization of closely related plant species by
doubling the chromosome number always results in a. allopolyploids. b. autopolyploids. c. infertile hybrids that must reproduce asexually. d. inviable hybrids. e. hybrids that are similar to only one of their two parents.