MCQ
Select the incorrect statement(s).

$i.$ Six codons do not code for any amino acid.

$ii.$ Codon is read in $mRNA$ in a contiguous fashion.

$iii.$ Three codons function as stop codons.

$iv.$ The initiation codon $AUG$ codes for methionine.

  • $(i) \;only$
  • B
    $(ii)\; only$
  • C
    $(i), (ii) \;and \;(iv)$
  • D
    $(i), (ii) \;and \;(iii)$

Answer

Correct option: A.
$(i) \;only$
a
$3$ codons do not code for any amino acid. Such codons are called non-sense codons or terminator codon. $Eg\; UAG, UAA \& UGA.$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

In which stage does crossing over take place?
Mutations are responsible for
$A$... regulators are able to maintain homeostasis by means which ensures constant body temperature, constant osmotic concentration, etc. All ...$B$... and ...$C$.... and is very few lower vertebrate and invertebrate species are indeed capable of such regulation (thermoregulation and osmoregulation)

Evolutionary biologists believe that the 'success' of mammals is largely due to their ability to maintain a constant body ...$D$... and thrive whether they live in Antarctica or in the Sahara desert
Choose the correct option for $A , B , C$ and $D$

The relationship between the two organisms or species in which both the partners derive benefit from each other is known as
Match the following techniques or instruments with their usage:

Column - $I$ Column - $II$
$(a)$ Bioreactor $(i)$ Separation of DNA fragments
$(b)$ Electrophoresis $(ii)$ Production of large quantities of products
$(c)$ $PCR$ $(iii)$ Detection of pathogen, based on antigen-antibody reaction
$(d)$ $ELISA$ $(iv)$ Amplification of nucleic acids

Select the correct option from following:

The number of triplet codons having all the three bases same in 64 triplet codons is:
Sperm head gets embedded in _________ after spermatogenesis.
The phenomenon observed in some plants wherein parts of the sexual apparatus is used for forming embryos without fertilisation is called:
$A.$ Humans reproduces.....

$B.$ Humans are $\ldots \ldots$

$C.$ Fertilization is .... in humans

$D.$ Male and female gametes are.....

$E.$ Zygote is.....

$F.$ The process of release of ovum from a mature follicle is called.....

$G.$ Ovulation is induced by a hormone called ......

$H.$ The fusion of male and female gametes is called.......

$I.$ Zygote divides to form... which is implanted in uterus

$J.$ The structure which provides vascular connection between foetus and uterus is called......

Blanks in the statements $A$ to $J$ in the above statement is

$DNA $ fingerprinting method is very useful for