A genomic library is
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Solution
a collection of cloned DNA pieces from an organism's genome.
Removal of ring wood of tissue outside the vascular cambium from the tree trunk kills it because
The age-structure diagram of a country like Mexico, which has a high population growth rate, has the shape of__________.
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Solution
The age structure of Mexico has a large fraction of individuals who are young and likely to reproduce in the near future. The overall shape is that of a pyramid.
If R. Q. is less than 1.0 in a respiratory metabolism, it would mean that
A particular species of tropical fish has only a few off spring and takes care of them for an extended period. We might also expect the fish population to
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Solution
Such a population exhibits an equilibrial life history.
Which one of the following triplet codes, is correctly matched with its specificity for an amino acid in protein synthesis or as ‘start’ or ‘stop’codon ?
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Solution
AUG is initiating codon. UCG codes for serine, UUU codes for phenylalanine, UGU codes for cysteine.
Which of the following organism is correctly matched with its common name ?
The enzyme rubisco is found in
A functional piece of mRNA has 66 codons. What is the maximum number of amino acids that could be present in the protein coded for by this mRNA?
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Solution
A functional strand of mRNA must have a start and a stop codon. The start codon often also codes for the amino acid methionine, which mayor may not end up being apart of the final protein. However, the stop codon would not code for an amino acid. Thus, with 66 codons in them RNA, there could be as many as 65 amino acids in the protein product.
Select the incorrect statement from the following:
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Solution
Baldness is a sex influenced trait. The dominance of alleles may differ in heterozygotes of the two sexes.
Which of the following is the pair of bio-fertilizers?
Red-green colour blindness is a human recessive sex-linked trait. A man and a woman with normal vision have a colour-blind son. What is the probability that their next child will also be a color-blind son?
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Solution
The probability of being male is 1⁄2. Since they have one color-blind son,the woman must be heterozygous.
Algin, carrageen and proteins are obtained from
Of the following, the one which is an example of buffer system in blood is
Which of following is not a protein hormone ?
Diphtheria is caused by
The early settlers on a barren area(rock) are
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Solution
Lichens are the early settlers on a barren area because they can tolerate desiccation, heating during summer noon or excessive cooling during winter nights. They secrete lichen acids and carbonic acid. The acids slowly corrode rock surface and release minerals required for proper growth of lichens.
RNA primersare necessary in DNA synthesis because
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Solution
DNA polymerase cannot initiate the building of a nucleotide strand; it can only add to an existing strand.Thus, RNA primers are necessary to begin DNA synthesis.
Flower of Fabaceae is
The intestine in human body is about 29 feet long, because