Recent questions tagged medium

Refer the below reaction A is

asked Mar 20, 2014 by sreemathi.v

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An alkane $C_7H_{16}$ is produced by the reaction of lithium di (3-pentyl) cuprate with ethyl bromide.The structural formula of the product is

asked Mar 20, 2014 by sreemathi.v

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1. The theca layer of ovarian follicles is organised into an inner theca interna and an outer theca externa. 2. The primary oocyte within the tertiary follicle grows in size and completes its first meiotic division. 3. First meiotic division is an unequal division resulting in the formation of a large haploid tertiary oocyte and a tiny first polar body Regarding 1,2 and 3 :

asked Mar 20, 2014 by pady_1

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1. Each primary oocyte then gets surrounded by a layer of granulosa cells and is called the primary follicle. 2. The primary follicles get surrounded by more layers of granulosa cells and a new theca and are called secondary follicles. 3. The secondary follicle soon transforms into a tertiary follicle which is characterised by a fluid filled cavity called antrum. Regarding 1,2 and 3 :

asked Mar 20, 2014 by pady_1

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1. Oogonia start division and enter into prophase-II of the meiotic division 2. Oogonia get temporarily arrested at that stage are called primary oocytes. 3. Each primary oocyte then gets surrounded by a layer of granulosa cells and is called the primary follicle. Regarding 1,2 and 3 :

asked Mar 20, 2014 by pady_1

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The human male ejaculates (i) about 20 to 30 million sperms during a coitus of which, (ii) for normal fertility, at least 40 per cent sperms must have normal shape and size and (iii) for normal fertility, at least 50 per cent of them must show vigorous motility. Regarding (i), (ii) and (iii) :

asked Mar 20, 2014 by pady_1

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1. A plasma membrane envelops the whole body of sperm. 2. The sperm head contains an elongated haploid nucleus. 3. The posterior portion of nucleus is covered by a cap-like structure, acrosome. 4. The acrosome is filled with enzymes that help fertilisation of the ovum. Regarding 1,2,3 and 4 :

asked Mar 20, 2014 by pady_1

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1. The spermatids are transformed into spermatozoa by the process called gametogenesis. 2. After spermiogenesis, sperm heads become embedded in the Leydig cells. 3. And they are finally released from the seminiferous tubules by the process called spermiation. Regarding 1,2 and 3 :

asked Mar 20, 2014 by pady_1

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1. Primary spermatocytes periodically undergo meiosis. 2. A primary spermatocyte completes the first meiotic division leading to formation of four secondary spermatocytes. 3. Secondary spermatocytes undergo the second meiotic division to produce four unequal, haploid spermatids. Regarding 1,2 and 3 :

asked Mar 20, 2014 by pady_1

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1. Each spermatogonium contains 46 chromosomes. 2. Primary spermatocytes have 23 chromosomes each. 3. Secondary spermatocytes also have 23 chromosomes each. Regarding 1,2 and 3 :

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Given the following statements:

asked Mar 20, 2014 by pady_1

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1. The glandular tissue of each breast is divided into 5-10 mammary lobes containing clusters of cells called alveoli. 2. The cells of alveoli secrete milk. 3. Milk is stored in the cavities (lumens) of alveoli. Regarding 1,2 and 3 :

asked Mar 20, 2014 by pady_1

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1. Mons pubis is a cushion of fatty tissue covered by skin and pubic hair. 2. The *** minora are fleshy folds of tissue, which extend down from the mons pubis and surround the vaginal opening. 3. The * majora are paired folds of tissue under the *** minora. Regarding 1,2 and 3 :

asked Mar 20, 2014 by pady_1

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1. The uterus opens into ****** through a broad cervix. 2. The cavity of the cervix is called cervical canal. 3. Cervical canal solely forms the birth canal. Regarding 1,2 and 3 :

asked Mar 20, 2014 by pady_1

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1. The infundibulum leads to a wider part of the oviduct called isthmus. 2. The last part of the oviduct is ampulla. 3. Ampulla has a narrow lumen. 4. Isthmus joins the uterus. Regarding 1,2,3 and 4 :

asked Mar 20, 2014 by pady_1

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Identify the correct order of reactivity in electrophilic substitution reaction of the following compounds:

asked Mar 20, 2014 by sreemathi.v

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1. The ovaries are located one on each side of the upper abdomen. 2. Each ovary is about 2 to 4 cm in length 3. They are connected to the pelvic wall and uterus by ligaments. Regarding 1,2 and 3 :

asked Mar 20, 2014 by pady_1

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The male reproductive system : 1. The testes are situated outside the abdominal cavity within a pouch called . 2. The helps in maintaining the high temperature of the testes, 2–2.5o C higher than the normal internal body temperature. 3. 2–2.5o C higher than the normal internal body temperature is necessary for spermatogenesis. Regarding 1,2 and 3 :

asked Mar 20, 2014 by pady_1

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ART: 1. The zygote or early embryos (with upto 8 blastomeres) could then be transferred into the fallopian tube(ZIFT) 2. Embryos with more than 8 blastomeres, into the uterus, to complete its further development.(IUT) 3. Embryos formed by in-vivo fertilisation (fusion of gametes within the female) also could be used for such transfer to assist those females who cannot conceive. Regarding 1,2 and 3 :

asked Mar 20, 2014 by pady_1

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In vitro fertilisation (IVF) : (i) also known as test tube baby programme (ii) ova from the wife/donor (female) and sperms from the husband/donor (male) are collected (iii) they are induced to form zygote (iv) under simulated conditions in the laboratory. Regarding (i), (ii), (iii) and (iv) :

asked Mar 20, 2014 by pady_1

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In ART : 1. In vitro fertilisation (IVF ) is fertilisation outside the body 2. It is done in almost similar conditions as that in the body. 3. IVF is followed by embryo transfer (ET) is one of such methods. Regarding 1,2 and 3 :

asked Mar 20, 2014 by pady_1

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1. Hepatitis–B and HIV can be transmitted by sharing of injection needles, razors, etc. 2. HIV can be transmitted by using surgical instruments used on for such patients and used after disinfection. 3. Hepatitis–B and HIV can be transmitted by transfusion of blood of an infected person. Regarding 1,2 and 3 :

asked Mar 20, 2014 by pady_1

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MTP: 1. MTPs are considered relatively safe during the first trimester. 2. Second trimester abortions are much more riskier. 3. Majority of the MTPs are performed illegally by unqualified quacks which are usually safe. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

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In tubectomy: 1. A small part of the fallopian tube is removed or tied up 2. It is done through a small incision in the abdomen or through ******. 3. This technique are least effective 4. But their reversibility is good. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

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In vasectomy: 1. A small part of the vas deferens is removed or tied up 2. It is done through a small incision on the ******* 3. Its reversibility is very poor. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

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1. Progestogens alone or in combination with estrogen can also be used by females as injections or implants under the skin. 2. Their mode of action is similar to that of pills 3. Their effective periods are short. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

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Regarding Oral Contraceptive pills: 1. Pills have to be taken daily for a period of 21 days starting preferably within the first five days of menstrual cycle. 2. After a gap of 7 days, it has to be repeated in the same pattern till contraconception is desired. 3. Menstruation occurs in between the 21 day course of tablet. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

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Intra Uterine Devices (IUDs) - copper releasing IUDs: (i) increase phagocytosis of sperms within the uterus (ii) the Cu ions released suppress sperm motility (iii) the Cu ions released suppress the fertilising capacity of sperms Regarding (i), (ii) and (iii):

asked Mar 20, 2014 by pady_1

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1. Mycoplasma are a group of fungus. 2. They are devoid of cell walls 3. They are highly pleomorphic, with fixed shape and size.

asked Mar 20, 2014 by pady_1

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Which of the following statements is true about Glycocalyx?

asked Mar 20, 2014 by pady_1

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1. Prokaryotes and unicellilar eukaryotes have something unique in the form of inclusions. 2. A specialised differentiated form of cell membrane called mesosome is the characteristic of prokaryotes. 3. They are essentially aggregations of cytoplasmic proteins. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

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Prokaryotes: 1. Most prokaryotes do not have a cell wall. 2. The fluid matrix filling the cell is the cytoplasm. 3. There is no well-defined nucleus. 4. The genetic material is basically naked, not enveloped by a nuclear membrane. Regarding 1,2,3 and 4:

asked Mar 20, 2014 by pady_1

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1. Prokaryotic cells are generally smaller 2. Thet multiply more rapidly than the eukaryotic cells. 3. They may vary greatly in shape and size. Regarding 1,2 and 3:

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CELL THEORY : 1. Matthias Schleiden, a German botanist observed that all plants are composed of different kinds of cells which form the tissues of the plant. 2. Theodore Schwann (1839), a British Zoologist, studied different types of animal cells and reported that cells had a thin outer layer (‘plasma membrane’). 3. Theodore Schwann also concluded that the presence of cell wall is a unique character of the plant cells. 4. Schwann proposed the hypothesis that the bodies of animals and plants are composed of cells and products of cells. Regarding 1,2,3 and 4:

asked Mar 20, 2014 by pady_1

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Regarding G.N. RAMACHANDRAN: 1. He was the founder of the ‘Madras school’ of conformational analysis of biopolymers. 2. His discovery of the triple helical structure of collagen published in Nature in 1954 3. His analysis of the allowed conformations of proteins through the use of the ‘Ramachandran plot’ rank among the most outstanding contributions in structural biology. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

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Class – Mammalia : 1. Sexes are separate 2. Fertilisation is internal. 3. They are always viviparous 4. Development is direct. Regarding 1,2,3 and 4:

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Class – Mammalia : 1. The skin of mammals is unique in possessing hair. 2. External ears or pinnae are absent in most species. 3. Different types of teeth are present in the jaw. Regarding 1,2 and 3:

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Class – Aves : 1. Heart is completely four- chambered. 2. Respiration is by lungs. 3. Air sacs connected to lungs supplement respiration. Regarding 1,2 and 3:

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Class – Reptilia : 1. Sexes are separate. 2. Fertilisation is internal. 3. They are oviparous 4. Development is direct. Regarding 1,2,3 and 4:

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Class – Amphibia : 1. Sexes are separate. 2. Fertilisation is external. 3. They are viviparous 4. Development is direct. Regarding 1,2,3 and 4:

asked Mar 20, 2014 by pady_1

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Class – Amphibia : 1. Alimentary canal, urinary and reproductive tracts open into a common chamber called cloaca 2. Cloaca opens to the exterior. 3. These are cold-blooded animals. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

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Class – Amphibia : 1. The amphibian skin is dry. 2. They do not have scales. 3. They don't have eyelids. Regarding 1,2 and 3:

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Class – Amphibia : 1. Most of them have two pairs of limbs. 2. Body is divisible into head and trunk. 3. Tail may be present in some. Regarding 1,2 and 3:

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Class – Osteichthyes : 1. Sexes are separate. 2. Fertilisation is usually internal. 3. They are mostly oviparous 4. Development is direct. Regarding 1,2,3 and 4:

asked Mar 20, 2014 by pady_1

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Class – Osteichthyes : 1. Air bladder is present 2. Air bladder regulates buoyancy (if present in any aquatic organism). 3. Heart is two- chambered 4. Heart has one auricle and one ventricle. Regarding 1,2,3 and 4:

asked Mar 20, 2014 by pady_1

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Class – Chondrichthyes : 1. Teeth are modified placoid scales 2. Teeth are directed forwards. 3. Their jaws are very powerful. 4. These animals are predaceous. Regarding 1,2,3 and 4:

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Regarding Class – Chondrichthyes : 1. They are marine animals 2. They have streamlined body 3. They have cartilaginous exoskeleton Regarding 1,2 and 3:

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Regarding Class – Cyclostomata : 1. Cyclostomes are marine 2. But they migrate to fresh water for spawning . 3. After spawning, they die within a few days. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

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Regarding Class – Cyclostomata : 1. They have an elongated body 2. They bear 6-15 pairs of gill slits. 3. Cyclostomes have a circular mouth without jaws Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

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1. Agnatha includes Class Cyclostomata. 2. Tetrapoda includes Pisces, Amphibia, Reptilia, Aves and Mammals 3. Pisces includes Chondrichthyes and Osteichthyes. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

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