What is the formation of two species from one original species called?
a. natural selection
b. evolution
c. speciation
d. divergence
c. speciation
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Which type of signaling regulates the pain response?
a. endocrine b. paracrine c. autocrine d. direct signal across gap junctions
When a phosphate group is transferred from ATP, active transport pumps ____
a. trigger exocytosis b. change their shapes c. become ionized d. fuse with the surrounding phospholipid membrane e. are destroyed
Which enzyme is used to bind DNA fragments together?
A) restriction enzyme B) lysozyme C) DNA ligase D) DNA polymerase
Methylation and acetylation are common changes made to histone H3, and the specific combination of these changes is sometimes referred to as the "histone code." Which of the following patterns will probably lead to gene silencing?
(a) lysine 9 methylation (b) lysine 4 methylation and lysine 9 acetylation (c) lysine 14 acetylation (d) lysine 9 acetylation and lysine 14 acetylation