Mesoderm that arises from the embryonic disk near the neural tube will become
a. digestive organs.
b. reproductive organs.
c. the heart.
d. most bones and skeletal muscles of the neck and trunk.
e. the lungs.
D
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Obligately anaerobic normal flora are found in ________, which is an/are anoxic habitat(s) of the body
A) the kidneys B) the skin C) portions of the oral cavity D) the lungs
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. Only amino acids contain sulfur. B. Only nucleic acids contain sulfur. C. Both nucleic acids and amino acids contain sulfur. D. The radioactive sulfur labels peptide bonds.
Gram-negative bacteria
A. appear purple following the Gram stain. B. include all pathogens. C. are generally more susceptible to antibiotics than gram-positive bacteria. D. have a more complex cell envelope with a greater variation in chemical composition.
This layer of the eye contains melanin and arteries that provide other parts with nutrients and oxygen
A) iris B) retina C) choroid D) sclera