The type of defense in which plants produce chemicals that cause the uninfected cells around a site of infection to die, leading to isolation of the infected region, is called:
A. systemic acquired resistance.
B. biotrophic defense.
C. avirulent resistance.
D. the hypersensitive response.
E. the wilting response.
D
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During the M checkpoint, the cell ____
a. proceeds to interphase and completes DNA replication b. proceeds to G2 phase and the cell prepares to divide c. proceeds to S phase or enters inactive G0 state d. monitors attachment of spindle fibers to chromosomes e. monitors completion of DNA synthesis and DNA damage
In which phase of translation are peptide bonds formed?
a. replication
b. transcription c. initiation d. elongation e. termination
Mammals, like humans and apes, have five digits on their fore and hind limbs. Modern horses have one. How might you reconstruct the ancestral state of mammal toe number?
A. Investigate the number of toes on all extant horses and apes. B. Investigate the number of toes for other mammals and use parsimony to deduce the ancestral state. C. Investigate the number of toes for an outgroup that is closely related to mammals, for example reptiles or amphibians. D. Either b or c E. All of the above
Sodium chloride (NaCl) crystals (table salt) form as a result of:
A) hydrogen bonding. B) being chemically stable. C) covalent bonding. D) the attraction of oppositely charged particles for each other.