Phase-contrast microscopy is suitable for observing which kind of sample?

1. Single cells 

2. Group of cells

3. Thin cell layers

4. Thick cell layers

Which of the following options is correct?

TLS Online TPP Program

#Question id: 344

#SCPH05 I Biotechnology

The partial negative charge at one end of a water molecule is attracted to the partial positive charge of another water molecule. What is this attraction called?

TLS Online TPP Program

#Question id: 15481

#I Life Science/ Life Sciences Group – I-V

One of the approaches for the bacterial strain improvement for primary metabolite include

TLS Online TPP Program

#Question id: 11016

#I Life Science/ Life Sciences Group – I-V

A ventricular depolarization wave when traveling −90° in the frontal plane will cause a large negative deflection in which lead?

TLS Online TPP Program

#Question id: 761

#SCPH05 I Biotechnology

In a DNA double helix each type of base forms a stable base pair with only one type of base. When bases on an RNA strand are involved in base pairing, which bases can form stable base pairs with more than one type of base?

TLS Online TPP Program

#Question id: 12909

#SCPH01 Biochemistry

According to the diagram, arrange the steps in correct order: 

1. DNA is then digested by the Cas9 nuclease at specific points on both DNA strands. 

2. Homologous recombination to repair the break and incorporate the new DNA sequence then follows. 

3.The nuclease Cas9 is targeted to DNA by a guide RNA consisting of a specific 20 nucleotide spacer/targeting sequence (crRNA).

 4. That identifies the DNA to be modified, linked to a trans-activating (tracrRNA) sequence necessary for the recruitment and stability of Cas9 nuclease.