What is the difference between a gene that is derepressed and one that is induced?
A. Genes that are derepressed are turned on because an inducer molecule is present. By comparison, a gene that is induced is turned on because a repressor protein is bound to the operator.
B. There is no difference between a gene that is derepressed and one that is induced.
C. A gene that is derepressed is turned on because a repressor protein is not bound without its cofactor. By comparison, a gene that is induced is turned on because an inducer molecule prevents binding of the repressor.
D. A derepressed gene is turned off and an induced gene is activated to be expressed.
Answer: C
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Synapsis is best described as:
A. the exchange of genetic information between sister chromatids. B. the alignment of non-sister chromatids at the metaphase plate. C. the exchange of genetic information between non-sister chromatids. D. the alignment of homologous chromosomes in prophase 1.
The purpose of the Calvin cycle is to
a. produce sugars using CO2 as a carbon source. b. recover electrons lost when water was split. c. capture photons of light. d. counteract increasing atmospheric CO2 concentrations (global warming). e. generate O2 gas for cellular respiration.
In nature, what is the order of events in processing the product of the gene for insulin?
A) cleavage of 35 amino acids from the middle of the polypeptide to make two chains that are then joined by disulfide bonds B) cleavage of 24 amino acids from the N terminus to form proinsulin that is subsequently cleaved to make A and B chains C) removal of 5? leader sequence from the mRNA, and splicing out of a large central intron to produce the mRNA that codes for the final form of polypeptide D) removal of large mRNA sequences by RNA editing, followed by splicing of the products of the two insulin genes E) transcription of the two insulin genes A and B, translation, and posttranslational joining of the two polypeptides
Which was the primary challenge animals faced in adapting to life on land?
a. The presence of new predators b. Being able to adapt to move on land c. The need for more oxygen to do work d. Finding a mate in the new environment e. The desiccating effect of the atmosphere