How is the bond in F2 different from the bond in KCl?
A. F2 is covalent and KCl is ionic
B. F2 is ionic and KCl is covalent
C. F2 and KCl are both ionic
Answer: A
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If speciation occurs with the production of two or more species in a small area, ____ is (are) probably
responsible.
a. both sympatric and parapatric speciation b. either sympatric or parapatric speciation c. neither sympatric or parapatric speciation d. only sympatric speciation e. only parapatric speciation
When a muscle fiber is relaxed, myosin cannot bind to actin because ____
a. ATP is not present b. the myosin binding site on actin is blocked c. the myosin head is in the wrong shape for binding d. the actin is in the wrong orientation for myosin binding e. the myosin head is 180 degrees from its attachment configuration
What structure is not divided during cytokinesis?
A. endoplasmic reticulum B. chromosome C. cytoplasm D. cell membrane E. cell wall
There was no protective ozone layer early in Earth's history, which allowed Earth's surface to be bombarded with ultraviolet radiation
Indicate whether the statement is true or false