DNA Helicase-The enzyme responsible for separating the two strands of DNA in a helix so that they can be copied during DNA replication. DNA Ligase-The enzyme responsible for sealing together breaks or nicks in a DNA strand. Responsible for patching together Okazaki fragments on the lagging strand during DNA replication.
A Doppler ultrasound is a noninvasive test that can be used to estimate your blood flow through blood vessels by bouncing high-frequency sound waves (ultrasound) off circulating red blood cells. A regular ultrasound uses sound waves to produce images, but can't show blood flow. A Doppler ultrasound may help diagnose many conditions, including: 1  Blood clots. 2  Poorly functioning valves in your leg veins, which can cause blood or other fluids to pool in your legs (venous insufficiency). 3  Heart valve defects and congenital heart disease. 4  A blocked artery (arterial occlusion).
In general, Iâm impressed with the Echoâs construction, especially the ring on top that glows blue when Alexa hears you, red when you press the mute button on top, and white when you twist it to adjust the volume.3 Itâs a nice piece of industrial design, simple and elegant.