#neet
- Histones are enriched with - Answer: 1. Lysine & Arginine Key idea: Histones are basic proteins that bind the acidic, negatively charged DNA. They are rich in the positi... 1
- The first menstruation is called : Answer: 2. Menarche Key idea: The first menstrual flow at puberty is menarche. Menopause is the permanent end of cycles, diapause is delayed... 1
- The protein portion of an enzyme is called : Answer: 3. Apoenzyme Key idea: A conjugated enzyme has a protein part and a non-protein part. The protein part is the apoenzyme. The non-pro... 1
- Each of the following characteristics represent a Kingdom proposed by Whittaker. Arrange the following in increasing order of complexity of body organization.A. Multicellular heterotrophs with cell wall made of chitin.B. Heterotrophs with tissue/orga… Answer: 2. C, E, A, D, B Key idea: Order by increasing body complexity across Whittaker's kingdoms. C: Monera, prokaryotes E: Protista, euka... 1
- Match List I with List II :List-I: A. Alfred Hershey and Martha Chase; B. Euchromatin; C. Frederick Griffith; D. HeterochromatinList-II: I. Streptococcus pneumoniae; II. Densely packed and dark-stained; III. Loosely packed and light-stained; IV. DNA… Answer: 3. A-IV, B-III, C-I, D-II Hershey and Chase: confirmed DNA as genetic material (IV) Euchromatin: loosely packed, light-stained (III)... 1
- Neoplastic characteristics of cells refer to :A. A mass of proliferating cellB. Rapid growth of cellsC. Invasion and damage to the surrounding tissueD. Those confined to original locationChoose the correct answer from the options given below: Answer: 2. A, B, C only Key idea: Neoplastic cells proliferate as a mass, grow rapidly and invade neighbouring tissue. A, B and C are correc... 1
- Given below are two statements :Statement I : The DNA fragments extracted from gel electrophoresis can be used in construction of recombinant DNA.Statement II : Smaller size DNA fragments are observed near anode while larger fragments are found near… Answer: 1. Both statement I and statement II are correct Key idea: Gel electrophoresis separates DNA by size, and the separated bands can be... 1
- Match List I with List II.List I: A. Adenosine B. Adenylic acid C. Adenine D. AlanineList II: I. Nitrogen base II. Nucleotide III. Nucleoside IV. Amino acidChoose the option with all correct matches. Answer: 3. A-III, B-II, C-I, D-IV Key idea: Know the building blocks of nucleic acids: base, nucleoside, nucleotide. Adenosine = adenine + s... 1
- Consider the following :A. The reductive division for the human female gametogenesis starts earlier than that of the male gametogenesis.B. The gap between the first meiotic division and the second meiotic division is much shorter for males compared t… Answer: 1. A and B are true Key idea: Compare timing of meiosis in the two sexes and the role of hormones. A is true. In females meiosis I b... 1
- All living members of the class Cyclostomata are: Answer: 4. Ectoparasite Key idea: Cyclostomes (lamprey, hagfish) are jawless vertebrates. All living members are ectoparasites on fishes. Th... 1
- Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : The primary function of the Golgi apparatus is to package the materials made by the endoplasmic reticulum and deliver it to intr… Answer: 1. Both A and R are true and R is the correct explanation of A Key idea: The Golgi apparatus is the packaging and dispatch centre of... 1
- Match List I with List II :List I: A. Scutellum B. Non-albuminous seed C. Epiblast D. PerispermList II: I. Persistent nucellus II. Cotyledon of Monocot seed III. Groundnut IV. Rudimentary cotyledonChoose the option with all correct matches. Answer: 1. A-II, B-III, C-IV, D-I Key idea: Seed structure terms. Scutellum is the single cotyledon of a monocot (grass) seed: A-II. Non-alb... 1
- Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : All vertebrates are chordates but all chordates are not vertebrate.Reason (R) : The members of subphylum vertebrata possess noto… Answer: 1. Both A and R are true and R is the correct explanation of A Key idea: All chordates have a notochord, but only vertebrates replac... 1
- Identify the statement that is NOT correct. Answer: 3. Antigen binding site is located at C-terminal region of antibody molecules. Key idea: An antibody is Y-shaped, made of 2 heavy an... 1
- Silencing of specific mRNA is possible via RNAi because of - Answer: 1. Complementary dsRNA Key idea: RNA interference (RNAi) works through double-stranded RNA. A dsRNA complementary to a specific mRNA... 1
- Genes R and Y follow independent assortment. If RRYY produce round yellow seeds and rryy produce wrinkled green seeds, what will be the phenotypic ratio of the F2 generation? Answer: 3. Phenotypic ratio - 9 : 3 : 3 : 1 Key idea: This is a standard dihybrid cross. RRYY x rryy gives F1 RrYy (all round yellow). Selfi... 1
- Match List - I with List - II.List - I: A. Heart B. Kidney C. Gastro-intestinal tract D. Adrenal CortexList - II: I. Erythropoietin II. Aldosterone III. Atrial natriuretic factor IV. SecretinChoose the correct answer from the options given below : Answer: 4. A-III, B-I, C-IV, D-II Key idea: Non-endocrine organs also secrete hormones. Heart: atrial natriuretic factor (A-III). Kidney: er... 1
- Which of the following is the unit of productivity of an Ecosystem? Answer: 4. (KCal m⁻²)yr⁻¹ Key idea: Productivity is the rate of biomass or energy production per unit area per unit time. So it needs an are... 1
- Sweet potato and potato represent a certain type of evolution. Select the correct combination of terms to explain the evolution. Answer: 1. Analogy, convergent Key idea: Different origin but similar function means analogy, which results from convergent evolution. Sweet... 1
- With the help of given pedigree, find out the probability for the birth of a child having no disease and being a carrier (has the disease mutation in one allele of the gene) in F3 generation. Answer: 1. 1/4 Key idea: The legend shows carriers only among females, so the trait is X-linked recessive. The F2 mother is a carrier: X^AX^... 1
- Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus.Reason (R) : Presence of more than one nuc… Answer: 1. Both A and R are true and R is the correct explanation of A Key idea: The tapetum is the innermost wall layer of the anther and n... 1
- How many meiotic and mitotic divisions need to occur for the development of a mature female gametophyte from the megaspore mother cell in an angiosperm plant? Answer: 3. 1 Meiosis and 3 Mitosis Key idea: Count divisions from megaspore mother cell (MMC) to the 7-celled, 8-nucleate embryo sac. MMC un... 1
- Which of the following is an example of a zygomorphic flower? Answer: 3. Pea Key idea: A zygomorphic flower can be divided into two equal halves in only one vertical plane. Pea (papilionaceous corolla)... 1
- After maturation, in primary lymphoid organs, the lymphocytes migrate for interaction with antigens to secondary lymphoid organ(s) / tissue(s) like:A. thymus B. bone marrow C. spleen D. lymph nodes E. Peyer's patchesChoose the correct answer from the… Answer: 4. C, D, E only Key idea: Primary lymphoid organs are thymus and bone marrow, where lymphocytes mature. Secondary lymphoid organs ar... 1