What is the role of light in photosynthesis?
A. It excites electrons.
B. It splits ATP molecules.
C. It is the source of electrons.
D. It fixes carbon into sugars.
Answer: A
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Which statement accurately describes global gene regulation in bacteria?
A) Sigma factors are not involved in gene regulation, only in attachment of the polymerase to the promoter. B) Alternative sigma factors that recognize different promoters are a mechanism of global gene regulation. C) E. coli cells devote more energy to the production of ribosomes during stress so that global gene regulation can occur. D) All promoters are recognized by all sigma factors.
Which gland is associated with biological
clocks or biorhythms?
a. pineal b. parathyroid c. hypothalamus d. pituitary e. thymus
Comparisons between the cytochrome b protein sequence in the honeycreeper versus the deer mouse and the Gough
Island finch reveals eighteen and four amino acid differences, respectively. Therefore, _____.
a. the honeycreeper is more closely related to the deer mouse b. the honeycreeper and the Gough Island finch are the same species c. the honeycreeper is more closely related to the Gough Island finch d. no DNA mutations have occurred during the evolution of the honeycreeper e. the DNA sequences of all three species are identical
A fixed effects model is one in which the data generating process includes:
A. some control variables (e.g., Income) that vary over time. B. controls for cross-sectional groups. C. a selected sample of cross-sectional units. D. controls for heteroscedasticity.