Reverse transcriptase is the viral enzyme responsible for making a DNA copy of the RNA genome from a retrovirus. As such, it is technically known as an RNA-dependent DNA polymerase. This is opposite to the usual flow of genetic information from DNA to RNA to protein.
This means downhill sections of the ride may be faster, and uphill sections slower. 1  Easy: Under 10 mph. 2  Leisurely: 10-12 mph. 3  Steady: 12-14 mph.  Moderate: 14-16 1  mph. Brisk: 16-18 2  mph. Vigorous: 18- 20 3  mph. Strenuous: 20-22  mph. Super Strenuous: 22+ mph.
Distance covered. Average speed varies to an extent with distance covered. Rides less than an hour or so in length will usually have a slightly lower average, because the first part of a ride is slower as your legs warm up. Rides between one and two hours usually have the greatest overall speed.Then for longer rides the average will often start to fall slightly, as fatigue plays an increasing role. For many of us rides over about three hours can become very tiring (assuming a reasonable sustained effort during those three hours!).ides between one and two hours usually have the greatest overall speed. Then for longer rides the average will often start to fall slightly, as fatigue plays an increasing role. For many of us rides over about three hours can become very tiring (assuming a reasonable sustained effort during those three hours!).