Bacteria are a commonly used organism for studies of genetic material in the research laboratory. The nucleic acids must first be isolated from the cells for these studies. Which of the following would most likely be used to lyse gram-positive bacterial cells for nucleic acid isolation?
A) lysozyme
B) polymixins
C) alcohol
D) water
E) mycolic acid
A
You might also like to view...
At the start of mitosis, how many sister chromatids are present in a human cell?
A. 23 B. 92 C. 46 D. 12
What sort of virus is shown in the photo below?
a. herpesvirus
b. retrovirus
c. bacteriophage
d. tobacco mosaic virus
In a strand of DNA, a hydrogen bond connects the phosphate group of one nucleotide to the sugar of the adjacent nucleotide
Indicate whether the statement is true or false
Botulinum toxin- A toxin produced by the bacterium Clostridium botulinum.Known for sometimes lethal poisoning from infected meat products. In modern controlled medical or cosmetic use, the very same toxin is known as Botox.Tetanus toxin- Another very potent neurotoxin produced by Clostridium tetani.Strichnine- A highly poisonous alkaloid produced by the Strychnos nux-vomica tree,historically used to kill rats and other pests.Botulinum toxin, or "botox," has become popular for cosmetic surgery. The toxin prevents neurosecretory vesicles from docking at the plasma membrane and releasing neurotransmitter. How would this toxin affect the neuromuscular junction?
A. Since ACh is not released, the muscles are not activated to contract and remain relaxed. B. Buildup of ACh causes promiscuous activation of all nearby sensory neurons. C. Buildup of ACh leaks back into the brain, creating a calming effect. D. Since ACh is not released, the muscles stay in a state of repeated contraction.