Biotechnology: Principles and Processes

Biotechnology: Principles and ProcessesNEET Botany · Class 12 · NCERT Chapter 7

Overview Notes NEET Questions Interactive Learning

3 interactive concept widgets for Biotechnology: Principles and Processes. Drag any slider, change any number, and watch the formula and the answer update live. Built so you understand how each NEET problem actually works, not just the final number.

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Restriction enzyme cut pattern explorer

PCR three-step cycle simulator

Biotechnology: 12-question NEET quiz

Restriction enzyme visualizer: palindromes and cut patterns

Select EcoRI, HindIII, SmaI, or BamHI to see its palindromic recognition sequence, where it cuts, and whether it produces sticky or blunt ends. Compare all four in the reference table.

Restriction enzyme visualizer

Select an enzyme to see its recognition sequence, palindrome structure, and cut pattern.

EcoRI

Sticky ends

Isolated from: E. coli RY13 (name derived from first letter of genus + two letters of species + isolation order)

Recognition sequence (palindrome):

Where the enzyme cuts (| = cut site):

···G | AATTC···

···CTTAA | G···

Left fragment

5'···G

3'···CTTAA

Right fragment

AATTC···3'

G···5'

Sticky ends (cohesive) — 5' — AATT overhang

Quick comparison

Enzyme	Recognition	End type	Overhang
EcoRI	GAATTC	sticky	4 nt
HindIII	AAGCTT	sticky	4 nt
SmaI	CCCGGG	blunt	None
BamHI	GGATCC	sticky	4 nt

PCR step simulator: denaturation, annealing, extension

Step through each PCR cycle phase, see the temperature for each step, and watch the copy count double. Adjust cycle number to see 2^n amplification on a log-scale chart.

PCR step simulator

Walk through each PCR step and watch the copy count double every cycle.

Current step

Denaturation

94 – 98°C

Cycle

1

of 30 (standard)

Copies

2^1

Denaturation
94 – 98°C
High heat breaks the hydrogen bonds between complementary base pairs. The double-stranded DNA melts into two single-stranded templates. Each strand will serve as a template in the next step.
Key concept
Why high temperature? Hydrogen bonds are weak individually but collectively strong — you need 94+ °C to separate an entire chromosome region reliably.

Annealing
50 – 65°C

Extension
72°C

Adjust cycle count manually

DNA copy number per cycle (log scale)

10^010^310^610^9

05101520253035

Cycle 1

2^1 = 2 copies

PCR ingredients checklist

Component	Role
Template DNA	Source of the target sequence to amplify
Forward primer	Binds 3' end of top strand; defines left boundary
Reverse primer	Binds 3' end of bottom strand; defines right boundary
Taq polymerase	Thermostable enzyme; synthesises new strand 5' to 3'
dNTPs	Building blocks (dATP, dTTP, dGTP, dCTP) for new strands
MgCl₂ buffer	Cofactor for Taq; optimal ionic environment

Biotechnology: Principles and Processes NEET quiz

12-question scored quiz covering restriction enzymes, palindromic sequences, PCR steps and calculations, gel electrophoresis, pBR322 insertional inactivation, and transformation methods.