Oxygen has an atomic number of 8. This
means that oxygen has 8
a. electrons in its outer most shell.
b. neutrons in its nucleus.
c. protons and 8 neutrons in its nucleus.
d. protons in its nucleus.
e. neutrons in its outer shell.
D
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The most frequent kind of mutation, point mutations, occur when (select all that apply)
A. a single base pair is replaced by another B. DNA repair mechanisms fail during replication. C. open reading frames are altered. D. a block of nucleotides are rearranged. E. none of these
As muscles contract, ________
a. actin heads bind to myosin filaments and slide them toward the middle of the sarcomere b. myosin heads bind to actin filaments and slide them toward the middle of the sarcomere c. myosin filaments change position d. filaments change length
A bird cracks open the seed coat with his teeth before swallowing
Indicate whether the statement is true or false.
The common house mouse species, Mus musculus, has the following taxonomic classification: Mus, Muridae, Rodentia, Mammalia, Chordata, Animalia, Eukarya. Which part of the name is the Family?
A. Muridae B. Chordata C. Animalia D. Rodentia