Answer:
The correct order of formation of cDNA or complementary DNA are described below.
Explanation:
The DNA that is synthesized from mRNA with the help of reverse transcriptase enzyme is known as cDNA or complementary DNA.
Formation of cDNA
Step 1 Mature RNA is isolated
Step 2 Reverse transcriptase provided with a primer,synthesize a strand of cDNA without introns.
Step 3 The mRNA is hydrolyzed by raising the pH.
Step 4 A primer site is created on the single stranded cDNA molecule.
Step 5 A complementary DNA strand is synthesized forming double stranded cDNA molecule.
Ok, a few things here:
This is an egg drop experiment, so I'm assuming you are testing out different ways of protecting the egg.
The independent variable is what you want to change: This would be the type of protection you have on the egg
The dependent variable is what would be effected by the changes in the independent variable: which would be something like the integrity of the egg after it hits the ground. You'd have to measure that somehow.
There are two types of controlled variables: <em>Internal and External.</em>
Internal variables are within the scope of the experiment and can be controlled, whereas external variables are outside the scope of the experiment and we have no control over them.
Internal:
- Height of the drop
- Type of egg
- Person dropping
- How the egg is dropped
- Surface being dropped on to
External:
- The person designated to drop the egg is sick
- You run out of eggs to drop
- Somebody loses all the planning for the experiment
- The weather forces you to do the experiment inside versus outside
- The wind blows your egg off course, leading to it hitting the ground at an angle
So, the way your teacher "chucks" the eggs off the roof should be a controlled internal variable. The action should be done as consistently as possible to avoid an uncontrolled variable.
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➷ The endocrine system is an organ system that works to produce and secrete hormones. It works by producing and secreting hormones that serve many purposes in the human body. For example, the secretion of insulin helps to regulate the level of glucose in the blood.
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➶ Hope This Helps You!
➶ Good Luck (:
➶ Have A Great Day ^-^
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Despite these similarities, prokaryotes and eukaryotes differ in a number of important ways. A prokaryote is a simple, single-celled organism that lacks a nucleus and membrane-bound organelles.
<span>Microscope slide holder. When you observe samples under a light microscope, they will usually be mounted on a glass slide. The slide holder is used to secure your slide in place so you will not inadvertently change its position.The paired knobs below the stage on the right-hand side move the slide holder either forward and back or left and right. These allow you to precisely control the position of the sample on the stageThe scales on the slide holder can be used to determine the position of an object on the slide. Thus, you can find an object, note its location, move to a new position and then later return to the mapped object. </span>The condenser. Below the stage is the condenser which is used to focus light on the sample. On the left side of the condenser is a knob that can be used to move the condenser up or down. In the up position, intense light is focused on the sample while in a lower position the light is less intense and more diffuse. As a general guide, you will usually want the condenser relatively high for looking at stained samples while a lower position may be preferable for increasing the contrast of unstained materials. The condenser also has an iris diaphragm which can be open or closed to control the light on the sample. The diaphragm opening is altered by moving the lever located at the front of the condenser.
Hope this information helps!
