In a plant, analysis of Rubisco reveals that, in some proteins, rbcL is deficient while rbcS is normal. In other Rubisco proteins, both rbcL and rbcS are normal. What does this indicate about the two genes encoding these subunits?
What will be an ideal response?
rbcS is encoded by a nuclear gene while rbcL is encoded by a chloroplast gene. The plant is heteroplasmic in that in some chloroplasts, there is a mutation in the gene encoding the rbcL and in other chloroplasts, the rbcL gene is normal.
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Neurotransmitters
a. include acetylcholine. b. change the permeability of postsynaptic cells. c. may be inhibitory or stimulatory. d. elicit graded potentials near the synapse. e. include all of these descriptions.
A researcher is assessing the expression of a certain protein in cells. This protein appears as a "web" in the cytoplasm of cells. The protein is likely a component of:
a. the basal lamina. b. cell junctions. c. All of these choices are correct. d. the extracellular matrix. e. the cytoskeleton.
Cytotoxic T cells destroy cancerous cells by
A. releasing vesicles containing perforin. B. opsonization. C. activating natural killer cells. D. secreting cytokines. E. forming the membrane attack complex.
Data produced by C. Bridges in the early part of this century indicate that sex in Drosophila is determined by ________
A) the number of Y chromosomes B) a balance between the number of X chromosomes and the number of haploid sets of autosomes C) the SRY gene D) the number of X chromosomes E) the ratio of X to Y chromosomes