Which of the following is not true of telomeres?

1.
telomeres are long repeats of nucleotides

2.
telomeres are present at the centers of all chromosomes

3.
telomeres extend from the ends of each chromosomes

4.
telomere sizes diminish with with cell division

4 points

QUESTION 16

During exercise in the elderly, the increase in heart rate is less than expected due to:

1.
An increase in the number of beta adrenergic receptors

2.
An increase in the transmitter, norepinephrine

3.
Changes in nodal tissue of the SA node

4.
An increase in the transmitter, acetylcholine

  
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