Life Sciences Glossary: From Jacobson՚s Organ to Krebs Cycle and Kwashiorkor

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Jacobson՚s Organ

Vomeronasal organs present in the roof of mouth, olfactory in function, highly developed in snakes.

Jaundice

A yellow discoloration of the skin. Mucous membranes and sclerae of the eye, caused by greater amount of bilirubin, a kind of pigment, in the blood.

Jejunum

The middle part of small intestine connecting duodenum with ileum.

Jellyfish

Coelenterate belonging to the class Sporozoan.

Joint

Any one of the connections between bones.

Jumping Gene

A segment of DNA that can move from one position in the genome to another.

Juvenile

A young person physiologically under- developed or immature normally less than 18 years.

Juvenile Hormone

Hormone produced by corpora alate of insects to keep larva in immature condition.

Juxtaglomerular Apparatus

The complex sensory cells found between afferent arteriole and DCT producing the enzyme renin.

Kilowatt- Hour

It is the unit of electrical energy; it is the amount of energy produced when one kilowatt of work is done in one hour.

Karyogamy

The fusion of cell nucleus as in conjugation.

Karyokinesis

The division of the nucleus during cell division.

Karyolymph

A clear fluid material within the nuclear membrane, “nuclear sap”

Karyon

The nucleus of a cell.

Karyotype

The chromosome constitution of a cell or an individual; chromosomes arranged in order of length and according to position of the centromere.

Keratin

A special insoluble protein found in the hair, nails, and other horny tissues of the epidermis.

Ketone Bodies

The metabolic products such as (hydroxybutyrate, acetoacetate and acetone produced during starvation and diabetes) .

Ketosis

Abnormal condition marked by excessive production of ketone bodies.

Kidney

A vertebrate and very important body organ concerned with excretion and osmoregulation.

Kinase

An enzyme that activates a proenzyme.

Kinesiology

The study of the movement of body parts.

Kinesis

Movements by an organism in random directions in response to stimulus.

Kinetochore

The region of chromosome where spindle Fibres become associated during mitosis and meiosis, also known as centromere.

Klinefelter՚s Syndrome

After Harry F. Klinefelter; XXY male (sterile) in human beings.

Krebs Cycle

After Hans A. Krebs; most common pathway for oxidative metabolism of pyruvic acid; also known as the citric acid cycle or the tricarboxylic acid cycle.

Kwashiorkor

A malnutrition disease, primarily of children, caused by severe protein deficiency.

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