In this experiment, step three uses a protease along with heat to denature and digest proteins within the cell. Does the protease or the heat digest the protein?
A) Protease digests proteins and heat denatures proteins
B) Heat digest proteins and protease denatures proteins
A) Protease digests proteins and heat denatures proteins
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Chromosomes can be condensed into compact structures, visible with the light microscope, but usually only:
A. while the nuclear pores are open. B. while the proteins are being assembled. C. after the cell is dead. D. while the DNA is being copied into RNA. E. during cell division.
The sense of pain is one of the most important of all the senses. Nociception is critical to survival because
_____ signals from nociceptors trigger memories and emotions associated with pain. _____ the activation or inhibition of enzymes are triggered by nociceptors in the brain. _____ pain triggers behavioral responses that protect from further danger. _____ signals from nociceptors tell an animal whether it has been injured and increase alertness and arousal.
In the Hershey-Chase experiment, bacterial viruses, called phage, were used to demonstrate that DNA is the genetic material. The phage that were used for this experiment consisted of DNA surrounded by a protein coat. Phage will attach to specific types of bacteria and inject their DNA into the bacterial cell. To scientifically determine whether DNA is the genetic material, Hershey and Chase made phage in a medium containing radioactive sulfur-35 (S35). Why was S35 used in this experiment?
A. The radioactive sulfur labels peptide bonds. B. Both nucleic acids and amino acids contain sulfur. C. Only amino acids contain sulfur. D. Only nucleic acids contain sulfur.
Redox reactions .
a. transfer energy b. transfer electrons c. involve oxidation and reduction d. are involved in all of the above