theory of continental drift, the world was made up of a single continent through most of geologic time. ... According to the generally acceptedplate-tectonics theory, scientists believe that Earth's surface is broken into a number of shifting slabs or plates, which average about 50 miles in thickness....

6 0

3 years ago

Arrange the events in the order that they occur during DNA replication. Tiles. Helicase unzips DNA to separate strands. Polymera

Leya [2.2K]

DNA exists in a coiled form in order for it to take up a smaller volume in the cell so that is why the first thing is that it needs to be unwound by topoisomerase. Then each piece is made up of two strands that must be separated as they need to be copied separately, so next the helicase unzips the DNA. DNA polymerase needs to have something to build off so because DNA can be synthesized, the Primase needs to make an RNA "primer". DNA is then synthesized but because it cannot synthesize the whole chromosome in one piece, after DNA synthesis, the ligase must glue the shorter pieces together to make the entire chromosome. Correct Order 1. Topoisomerase unwinds the coiled DNA 2. Helicase unzips DNA to separate strands 3. Primase lays down short RNA strands 4. Polymerase synthesizes new DNA strands 5. The new strands are glued using ligase

7 0

3 years ago

Read 2 more answers

Artificial selection involves enhancing the natural characteristics of a species

Aleksandr [31]

I believe that’s true

7 0

3 years ago

Read 2 more answers

For each glucose that enters glycolysis, _____ acetyl CoA enter the citric acid cycle. For each glucose that enters glycolysis,

klio [65]

Answer:

For each glucose that enters glycolysis, 2 acetyl CoA enter the citric acid cycle.

Explanation:

SYNTHESIS OF 2Acetyl CoA -:

The glucose is transformed into 2pyruvate (6 carbon molecules are converted into 2 -3 carbon molecules) during glycolysis. In both aerobic and anaerobic respiration, glycolysis occurs frequently. This process takes place in the cytoplasm (it does not require oxygen or mitochondria), but if both oxygen and mitochondria are present, two molecules of pyruvate join mitochondria and prepare for citric acid cycle.

Until entering this, the molecules go through a mechanism known as the linked (connects glycolysis with citric acid cycle) reaction, in which the pyruvate molecule is transformed into 2 acetyl CoA (meaning 3 carbon molecules are converted into 2 carbon molecules) and a carbon molecule is released in the form of $2CO_2$ (waste product).

2NAD+ and NADH are synthesized in the linked reaction, implying that reducing power is produced. It means that electrons from pyruvate are released in the form of hydrogen, which 2NAD+ accepts and reduces to form 2 NADH.

$Glucose$ → $2pyruvate$ → $2Acetyl CoA$

Linked reaction is also known as oxidative -dicarboxylation.

Hence, 2 Acetyl CoA is required to enter citric acid cycle.

7 0

3 years ago