Parathyroid hormone causes the blood calcium level to rise, but calcitonin causes those levels to fall. The relationship between the two hormones is described as ________
A) expressive
B) antagonistic
C) synergistic
D) permissive
B
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Which of the following statements best describes DNA polymerase?
A. It is an enzyme required to produce a primer needed for DNA replication. B. It is an enzyme that catalyzes the addition of nucleotides to the 5? end of a growing DNA strand. C. It is an enzyme that catalyzes the addition of nucleotides to the 3? end of a growing DNA strand. D. It is an enzyme required to glue pieces of DNA fragments together. E. It is an enzyme that polymerizes the DNA and keeps the replication fork open.
Which of the following is in the correct order from smallest to largest structures?
a. myosin head, sarcomere, myofibril, muscle fiber b. sarcomere, myosin head, muscle fiber, myofibril c. myofibril, myosin head, sarcomere, muscle fiber d. muscle fiber, sarcomere, myofibril, myosin head
Which of the following is associated with the Calvin cycle?
a. stroma b. mitochondria c. oxygen d. glucose
Which one of the following ions outside the neuron would make it very difficult for a depolarization to occur?
A) potassium B) sodium C) chloride D) manganese