Gene families can contain two members or hundreds of members. The duplicated copies can either remain tandemly associated or can be dispersed by recombination to different chromosomes
Give two examples of genes that are present in large tandem arrays in eukaryotic genomes.
What will be an ideal response?
Ans: Extensive tandem repetition of a gene may occur when the product (RNA or protein) is needed in large amounts. Examples are the genes for rRNA and genes for histone proteins.
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Cells that are programmed to die, shrivel and shrink in a process called
A. apoptosis. B. necrosis. C. totipotency. D. induction. E. encoded death.
Which one of the following is not a component of a phospholipid?
A. a three-carbon backbone such as glycerol B. a phosphate group C. two fatty acid tails D. a core of four fused carbon rings E. three-carbon backbone such as glycerol, a phosphate group, two fatty acid tails and a core of four fused carbon rings are all components of phospholipids.
In a strand of DNA, a hydrogen bond connects the phosphate group of one nucleotide to the sugar of the adjacent nucleotide
Indicate whether the statement is true or false
____ are leukocytes that produce antibodies
a. Lymphocytes b. Basophils c. Eosinophils d. Monocytes e. Neutrophils