NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions



The one advantage of cleistogamy is

  • It leads to greater genetic diversity

  • Seed dispersal is more efficient and wide spread

  • seed set is not dependent on pollinators

  • Each visit of pollinator results in the transfer of hundreds of pollen grains


seed set is not dependent on pollinators

Cleistogamous flowers do not open so, they self-pollinate and thus, do not depend on pollinators.


In peal plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants could you expect in F1-generation

  • 9 : 1

  • 1 : 3

  • 3 : 1

  • 50 : 50


In a mutational event, when adenine is replaced by guanine, it is a case of

  • Frameshift mutation

  • Transcription

  • Transition

  • Transversion


Which of the following is true regarding the phase lambda, a virus which infects bacteria?

  • In the lytic cycle, the bacterial host replicates viral DNA, passing it on to daughter cells during binary fission

  • In the lysogenic cycle, the bacteria-host replicates viral DNA, passing it onto daughter cells during binary fission

  • In the lytic cycle, viral DNA is integrated into the host genome

  • In the lysogenic cycle, the host bacterial cell burst, releasing phases


The part of the bacterial chromosomes sharing homology with genome fragment transferred from the recipients to cell during emrozygote formation is known as

  • Eugenic

  • Exogenate

  • Endogenate

  • Dysgenic


In 1944, Avery, McCarty and MacLeod isolated substance from heat killed a virulent form of bacteria and added to the non-virulent form of bacteria which changed the non-virulent to virulent from this substance can be destroyed by

  • DNAse

  • Protease

  • Lipase

  • Amylase


Match the following Column I with Column II.

Column I Column II
A. Complementrary Ratio  1. 9:7
B. Supplementary Ratio 2. 9:3:4
C. Epistatic Ratio 3. 12:3:1
D. Inhibitory Ratio 4. 13:3

  • A-4, B-1, C-3, D-2

  • A-1, B-2, C-3, D-4

  • A-4, B-1, C-2, D-3

  • A-1, B-3, C-2, D-4


Which of the following statements is false regarding SDS-polyacrylamide gel electrophoresis?

  • Proteins are separated by molecular weight

  • SDS is a detergent which gives charge to protein

  • Large protein move more slowly through gel

  • SDS is used to maintain the 3-dimensional structure of protein


The protein products of tumour suppressor gene may

  • Be present in non-cancerous cells

  • Cause signal cell death

  • Regulate the cell cycle

  • All of the above


Match the following column I with column II.

Column I Column II
A. Carcinogen 1. Cancerous Tumour
B. Anaphase -I 2. Disjunction
C. Mitosis 3. Synapse
D. Zygotene 4. Plectonemic Coiling

  • A-1, B-2, C-4, D-3

  • A-3, B-1, C-4, D-2

  • A-2, B-3, C-1, D-4

  • A-4, B-1, C-3, D-2