NEET UG
- Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP ? Answer: 3. Mitochondrion Key idea: ATP is made from the breakdown of food by cellular respiration. The mitochondrion oxidises pyruvate from... 1
- Which ecosystem has the maximum biomass ? Answer: 4. Forest ecosystem Key idea: Biomass depends on the amount and size of the living organisms. A forest has large trees and a very la... 1
- During DNA replication, Okazaki fragments are used to elongate : Answer: 3. The lagging strand away from the replication fork. Key idea: DNA polymerase can add nucleotides only in the 5' to 3' direction. O... 1
- A disease caused by an autosomal primary non-disjunction is : Answer: 4. Down's Syndrome Key idea: Non-disjunction of an autosome gives a trisomy or monosomy of an autosome. Down's syndrome is trisomy 2... 1
- Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement. Answer: 2. Thalassemia is due to less synthesis of globin molecules. Key idea: The two disorders differ in the type of globin defect. Thalas... 1
- Spliceosomes are not found in cells of : Answer: 3. Bacteria Key idea: Spliceosomes remove introns from hnRNA (pre-mRNA) in eukaryotes. Fungi, animals and plants are eukaryotes and... 1
- Phosphoenol pyruvate (PEP) is the primary CO_2 acceptor in : Answer: 1. C₄ plants Key idea: The first CO₂ acceptor differs in C3 and C4 plants. In C₄ plants, phosphoenol pyruvate (PEP) in the mesophyll... 1
- Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by : Answer: 2. Wind Key idea: A single ovule per ovary with flowers packed into an inflorescence is a classic wind-pollination syndrome (e.g. gr... 1
- The vascular cambium normally gives rise to : Answer: 2. Secondary xylem Key idea: Vascular cambium is a lateral meristem that adds cells on both sides. It cuts off secondary xylem inwar... 1
- What is the criterion for DNA fragments movement on agarose gel during gel electrophoresis ? Answer: 1. The smaller the fragment size, the farther it moves Key idea: The gel acts as a sieve. All DNA fragments are negatively charged a... 1
- Which of the following represents order of 'Horse' ? Answer: 1. Perissodactyla Key idea: The classification of the horse is: Kingdom Animalia, Phylum Chordata, Class Mammalia, Order Perissodact... 1
- The hepatic portal vein drains blood to liver from : Answer: 3. Intestine Key idea: The hepatic portal vein carries nutrient-rich blood from the digestive organs to the liver. Of the options, t... 1
- GnRH, a hypothalamic hormone, needed in reproduction, acts on : Answer: 1. anterior pituitary gland and stimulates secretion of LH and FSH. Key idea: Hypothalamic releasing hormones act on the anterior pi... 1
- Receptor sites for neurotransmitters are present on : Answer: 3. post-synaptic membrane Key idea: At a chemical synapse the neurotransmitter crosses the cleft and binds to receptors on the next... 1
- The pivot joint between atlas and axis is a type of : Answer: 2. synovial joint Key idea: Joints that allow free movement are synovial. The atlas-axis joint (the odontoid process turning in a ri... 1
- In case of a couple where the male is having a very low sperm count, which technique will be suitable for fertilisation ? Answer: 2. Artificial Insemination Key idea: When the male has a very low sperm count, semen is collected, concentrated and placed in the fe... 1
- The function of copper ions in copper releasing IUD's is : Answer: 4. They suppress sperm motility and fertilising capacity of sperms. Key idea: Cu ions released by the IUD act mainly on sperm. Coppe... 1
- Which of the following options best represents the enzyme composition of pancreatic juice ? Answer: 3. lipase, amylase, trypsinogen, procarboxypeptidase Key idea: Pancreatic juice contains inactive and active digestive enzymes for a... 1
- Select the mismatch :(1) Rhodospirillum - Mycorrhiza(2) Anabaena - Nitrogen fixer(3) Rhizobium - Alfalfa(4) Frankia - Alnus Answer: 1. Rhodospirillum - Mycorrhiza Key idea: Match each microbe with its true role. Rhodospirillum is a photosynthetic purple bacterium... 1
- Which one of the following statements is correct, with reference to enzymes ? Answer: 1. Holoenzyme = Apoenzyme + Coenzyme Key idea: An active conjugated enzyme has a protein part and a non-protein part. The protein pa... 1
- An example of colonial alga is : Answer: 1. Volvox Key idea: Colonial algae have a fixed number of cells living together as one unit. Volvox forms a spherical colony of many... 1
- Alexander Von Humbolt described for the first time : Answer: 2. Species area relationships Key idea: Alexander von Humboldt studied plant diversity in South American forests. He found that spec... 1
- The association of histone H1 with a nucleosome indicates : Answer: 2. The DNA is condensed into a Chromatin Fibre. Key idea: Histone H1 is the linker histone that seals the nucleosome. H1 binds the l... 1
- DNA replication in bacteria occurs : Answer: 2. Prior to fission Key idea: Bacteria have no nucleus and no defined cell cycle phases. They have no nucleolus and no S phase (that... 1