A student took her pulse three times while lying at rest and recorded the following values: 16 beats, 20 beats, and 18 beats in 20 seconds. the average resting heart rate for the student is 21 beats/minute
42 beats/minute
54 beats/minute
72 beats/minute
90 beats/minute

54 beats/minute

Explanation:

First find the average heart rate from the data given

16+20+18=54

54/3=18

So her average heart rate for 20 seconds is 18

To find her heart rate in beats per minute multiply 18 times 3 because 20 seconds is a third of a minute

18x3=54

So, her average resting heart rate in beats/minute is 54

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.

answer: dna

because all cells have genes