To find the gene that encodes for the blue-light receptor, researchers inserted the gene for the PHOT1 protein into insect cells growing in culture
When they exposed the transgenic cells to blue light, they found that the PHOT1 protein became phosphorylated. No other plant proteins were present in the insect cells. Which of the following is a reasonable conclusion from this result? The PHOT1 protein _____.
A) enabled the insect cells to photosynthesize
B) phosphorylated itself in the presence of blue light
C) is not responsive to blue light
D) is photoreversible
E) is not functional in insect cells
Answer: B
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Endemic species occur in one area and nowhere else on earth
1.True 2.False
Which of the following is true about the structure of the microtubule wall?
A) ?-?-tubulin heterodimers are arranged with mixed orientation in each protofilament, and protofilaments are arranged with mixed polarity in the microtubule wall. B) ?-?-tubulin heterodimers are arranged with the same orientation in each protofilament, and protofilaments are arranged with mixed polarity in the microtubule wall. C) ?-?-tubulin heterodimers are arranged with the mixed orientation in each protofilament, and protofilaments are arranged with same polarity in the microtubule wall. D) ?-?-tubulin heterodimers are arranged with the same orientation in each protofilament, and protofilaments are arranged with same polarity in the microtubule wall. E) Orientation of the ?-?-tubulin heterodimers is completely random and depends on which end of the dimer first hits the end of the microtubule when it assembles.
The law of segregation states that
A) when two identical alleles come together, complete dominance occurs in terms of phenotype. B) genes for different traits assort independently of each other during the formation of egg and sperm. C) genes separate from each other during gamete formation so that each sperm and egg receive only one allele from each pair. D) when different alleles for the same trait come together, one allele will be recessive to another. E) different alleles for the same gene occupy unique loci on sister chromatids.
Given that CO2 is produced by cellular respiration, why does the amount of CO2 in the atmosphere remain relatively constant? (When answering this question, exclude the impact of human activities on atmospheric CO2.)
A) CO2 is converted to carbohydrates in photosynthesis. B) CO2 is split apart during photosynthesis. C) CO2 mostly forms carbonate rocks. D) CO2 is trapped in dead organisms' bodies.