A gene variant that, when homozygous, may be common to people with addictions to different substances is
A) the CFTR allele that also causes cystic fibrosis.
B) the serotonin transporter A5.
C) the A1 allele of the dopamine D(2) receptor.
D) the dopamine transporter B3.
C) the A1 allele of the dopamine D(2) receptor.
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Scientists can gain information about ancient atmospheric CO2 levels through ice core data. This is primarily the result of sediments being trapped in glaciers, which scientists can subsequently assess for different carbon isotopes (13C, 12C, 14C)
A. true B. false
A dysfunctional cell lacks a signal peptidase and is unable to cleave the ER signal sequence from proteins translated in the ER. What will be the effect on the cell's proteins?
A. The cell will have no integral membrane proteins B. All cellular proteins will have an ER signal sequence C. There will be a common signal sequence at the N-terminus of all integral membrane proteins in the plasma membrane D. All cellular proteins will become membrane proteins E. There will be a common signal sequence at the C-terminus of all integral membrane proteins in the nuclear envelope
Archaea have multiple types of RNA polymerase
Indicate whether the statement is true or false.
Given the distribution of the 30 or so animal phyla across the Earth's various ecosystems, what would be the most likely habitat for the origin of animals?
A. Oceans B. Rain forests C. Temperate grassland D. Deserts E. Freshwater habitats