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During the course of a physiology laboratory, a student finds that her PR interval is 0.24 second. Concerned, she takes her own ECG again an hour later and sees an area of the ECG strip where the PR interval becomes longer and longer. Performing an ECG measurement on herself for a third time, she sees an area of the strip where a P wave is not followed by a QRS or T; farther along in the strip, however, a normal pattern reappears. What do you think these recordings indicate? i understand the first 3 reading that they indicate an AV block but why would it suddenly go back to normal?
In which chloroplast structure are chlorophyll molecules found? Chlorophyll molecules are placed in an organized manner in order to increase the exposure to light on the thylak
Suppose that there are six pairs of alleles which control height and that every dominant allele adds 5cm to the stature. Assume also that the average height of an adult (with equal
How many different proteins, each composed of 8 amino acids, can be constructed using the 20 different amino acids found in proteins?
Define Amylopectin - carbohydrates? Amylopectin differs from amylose in being highly branched. Short side chains of about 30 glucose units are attached with α (1-6) linkages ap
Critical Thinking Why is it necessary to use the same restriction enzyme to cut two pieces of DNA that are to be joined together? As each restriction enzyme recognizes a specif
Q. In chemical terms how is the neuronal repolarization achieved? Repolarization is the return of the membrane probable from the action potential (+35 mV) to the resting potent
Q. Since the visual images are projected in an inverted manner on the retina why don't we see things upside down? Since the crystalline lens is a convex spherical lens it forms
Database Search: Once an open reading frame or the partial amino acid sequence has been pre-determined, the investigator compares sequence with others in the databases using a com
Helix-turn-helix This motif have of two -helices divided by a short (four-amino acid) peptide sequence which forms a -turn that shown in above figure. When
Q. Can you explain Cholera? Cholera is one of the diseases which had caused epidemics all over the world. The organism which causes the disease is Vibrio cholerae. It is an
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