Is there a relationship between the problems encountered cloning mammals and the rarity of polyploidy in this group?
What will be an ideal response?
Possibly so; mammals, unlike some animal groups, appear to be extremely sensitive to gene dosage and even small perturbations in developmental pathways.
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Which of the following is NOT a lipid?
a. steroids b. triglycerides c. oils d. waxes e. monosaccharides
Years before Schwann’s pronouncement that a cell
has a life of its own even as a component of a multicellular organism, the cell nucleus had been discovered by a. Robert Hooke. b. Robert Brown. c. Theodor Schwann. d. Rudolf Virchow. e. Anton van Leeuwenhoek.
Sound amplification happens in the middle ear because of ________
A) size difference between the eardrum and oval window B) lever action of the ossicles C) resonance in the efferent outer hair cells D) stapedial reflex
The effects of mutation in human somatic cells have a low probability of causing harm because only _______ of human DNA encodes gene products.
A. greater than 5 percent B. less than 2 percent C. less than 4 percent D. greater than 8 percent E. greater than 3 percent