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.
If you are new to cycling, work on riding at a steady pace with a few short intervals of a more challenging speed, like 14 to 15 mph. The NutriStrategy website categorizes riding at speeds of 14 to 15.9 mph as a vigorous pace. Speeds above 16 mph are considered very vigorous while riding a bicycle.f you feel more comfortable at a moderate pace of 12 to 13.9 mph, and you weigh the same amount, youâll burn an average of 563 calories per hour.