Operating a Pipette

Where should the tip be placed?

Inside the receiving container
Against the side wall of the receiving container (correct)
On the top rim of the receiving container
On the bottom of the receiving container

What action should be performed with the thumb knob in the first step?

Release the thumb knob slowly
Smoothly depress the thumb knob to the first stop (correct)
Turn the thumb knob clockwise
Depress the thumb knob to the second stop

What should you do after depressing the thumb knob to the first stop?

Rotate the thumb knob counterclockwise
Pause before proceeding (correct)
Release the thumb knob immediately
Depress the thumb knob to the third stop

How many stops should the thumb knob be depressed to?

Two stops (C) Signup and view all the answers

What is the final action to be performed with the thumb knob?

Depress the knob to the second stop (A) Signup and view all the answers

What is the reason for antibody formation against the Rh positive newborn?

Mother's blood incompatibility with the newborn (C) Signup and view all the answers

At what gestation period does the mother typically receive an injection?

28 weeks gestation (C) Signup and view all the answers

What is the purpose of the injection given to the mother?

To avoid the development of antibodies toward the fetus (B) Signup and view all the answers

How many times does the mother typically receive the injection?

Twice, at 28 weeks gestation and at birth (B) Signup and view all the answers

Why is the injection important for the health of the newborn?

To reduce the risk of blood incompatibility (B) Signup and view all the answers

What is the substitution that occurs in the β-chains of HbS?

Glutamate is replaced with valine (B) Signup and view all the answers

How many α-chains and β-chains are present in HbS?

2 α-chains and 2 β-chains (C) Signup and view all the answers

What is the normal composition of α-chains in HbS?

2 normal α-chains (D) Signup and view all the answers

What is the position of the substitution in the β-chains of HbS?

Position six (A) Signup and view all the answers

What is the result of the substitution in the β-chains of HbS?

Formation of HbS (A) Signup and view all the answers

What is the affinity of Hb to CO compared to O2?

210-times higher (B) Signup and view all the answers

What is the lethal effect of CO if it reaches what percentage of blood HB?

60% or more (C) Signup and view all the answers

What can be said about the binding of CO to Hb?

It has a higher affinity than oxygen for Hb (B) Signup and view all the answers

What is the result of CO binding to Hb?

Decreased oxygen transport (A) Signup and view all the answers

What is the effect of high CO concentrations on the body?

Decreased oxygenation of tissues (C) Signup and view all the answers

What is the function of a nucleotide?

To serve as the basic building block of nucleic acids (D) Signup and view all the answers

What type of molecules are nucleotides the building blocks of?

Nucleic acids (A) Signup and view all the answers

What is the relationship between nucleotides and RNA and DNA?

Nucleotides are the building blocks of RNA and DNA (D) Signup and view all the answers

What is the role of nucleotides in the structure of genetic material?

They are the basic units that make up the genetic material (C) Signup and view all the answers

What is the significance of nucleotides in molecular biology?

They are the fundamental units of heredity (D) Signup and view all the answers