You are working on a research project that involves a mutational analysis of the light harvesting complex Lhca1, which is an important light harvesting complex found in plants. Your labmate asks where this complex is located. You say it is in the
A. inner chloroplast membrane
B. matrix
C. thylakoid membrane
D. stroma
E. outer chloroplast membrane
Answer: C
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An Rh-negative mother will need a special treatment if she gives birth to an Rh-positive baby. The treatment involves the destruction of any stray blood cells from the baby that pass into the mother's bloodstream. Why is this necessary?
A) The mother's immune system will attack the Rh-positive cells and produce antibodies that will attack a fetus in a subsequent pregnancy. B) The mother's immune system will attack her own blood cells and the cells in the fetus of a subsequent pregnancy. C) Without this treatment, the mother's immune system will attack only her own blood cells. D) Without this treatment, antibodies will be formed in breast milk, which could harm the baby.
Nitrogen (N) normally forms three covalent bonds with a valence of 5. However, ammonium has four covalent bonds, each to a different hydrogen (H) atom (H has a valence of 1). What do you predict to be the charge on ammonium?
A) +1 B) -1 C) +2 D) -2
What effect does coevolution most likely have on niche overlap?
What will be an ideal response?
In order to successfully and safely deliver a gene to a human cell, a virus vector must be
A) both infectious and pathogenic. B) packaged with RNA rather than DNA. C) pathogenic but not infectious. D) infectious but not pathogenic. E) a retrovirus.