Biology MCQs

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Bioethanol is denatured alcohol that is also called Methylated spirit. It is a liquid made from alcohol and other chemicals.

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chimeric DNA is another name of rDNA technology because it can be made of material from two different species, like mythological imagery. R-DNA technology uses palindromic sequences and leads to the production of sticky and blunt ends.

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Bt toxin is produced by a bacterium called Bacillus thuringiensis.

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The membranes of chill sensitive plants have about a 2 :1 ratio of unsaturated to saturated fatty acids. It has been seen that the proportion of unsaturated membrane fatty acids increases and the critical temperature decreases so that chill-sensitive plants are more acclimitized to low temperatures.

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Tuberculosis caused by Mycobacterium tuberculie which primarily affects lungs although can affect other body too while early 19th century was called ‘white plague’ because of the large number of the people dying of its infection.

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Among the many things parents hand down to their children are 23 pairs of chromosomes-those thread-like structures in the nucleus of every cell containing the genetic instructions for every person. One of those pairs are the chromosomes that determine the biological sex of a child – girls have an XX pair and boys have an XY pair. Females always pass an X chromosome onto their offspring. If the father passes on an X chromosome, the baby will be genetically female, and if the father passes on a Y chromosome, the baby will be genetically male.

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Crown gall is a disease caused by the bacterium Agrobacterium tumefaciens (synonym Rhizobium radiobacter), which enters the plant through wounds in roots or stems and stimulates the plant tissues to grow in a disorganized way, producing swollen galls. As the disease progresses, plants lose vigour and may eventually die. In science of Biotechnology, it is considered as natural engineer.

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A tendon is a fibrous connective tissue which attaches muscle to bone. A ligament is a fibrous connective tissue which attaches bone to bone, and usually serves to hold structures together and keep them stable.

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Hydroponics is a method of growing plants using mineral nutrient solutions, in water, without soil. Plants are grown with their roots in the mineral nutrient solution only or in an inert medium, such as perlite, gravel, mineral wool, expanded clay pebbles or coconut husk. The method is adopted to study the effect of mineral deficiency of a macro or micronutrient on a plant.

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Pulses come under the category of dicot seeds as they contain two cotyledons, hence the term ‘dicotyledon’ where ‘di’ symbolizes two. These seeds house two seedlings within their seed coat. Furthermore, the legume plant family, composed of various types of pulses, beans, peas, and lentils, are common instances of dicot seeds.