All land plants produce a protected embryo during their reproductive cycle
1.True
2.False
1
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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
Cytoplasmic division in animal cells involves
all EXCEPT a. formation of a cell plate. b. a contractile ring mechanism. c. a deepening cleavage furrow. d. a ring of actin filaments under the plasma membrane at the equator. e. ATP.
Muscle contraction is required for expiration.
Answer the following statement true (T) or false (F)
Sex-linked genes are located on
A) the autosomal chromosomes. B) the Y chromosome only. C) the X chromosome only. D) both the X chromosome and the Y chromosome.