In rabbits, there are four alleles at the c locus
Arranged in dominance sequence they are:C
(agouti), cch(chinchilla), ch(Himalayan), and c
(albino)
(a) Is it possible to cross two agouti rabbits and
produce both chinchilla and Himalayan
offspring?
(b) Is it possible to cross two chinchillas and
produce 1/2 chinchilla and 1/2 Himalayan? What will be an ideal response?
Answer: (a) no;(b) not likely but possible—would expect a 3:1
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H. V. Wilson worked with sponges to gain some insight into exactly what was responsible for holding adjacent cells together. He exposed two species of differently pigmented sponges to a chemical that disrupted the cell-cell interaction (cell junctions)
, and the cells of the sponges dissociated. Wilson then mixed the cells of the two species and removed the chemical that caused the cells to dissociate. Wilson found that the sponges reassembled into two separate species. The cells from one species did not interact or form associations with the cells of the other species. How do you explain the results of Wilson's experiments? A) The two species of sponge had different enzymes that functioned in the reassembly process. B) The molecules responsible for cell-cell adhesion (cell junctions) were irreversibly destroyed during the experiment. C) The molecules responsible for cell-cell adhesion (cell junctions) differed between the two species of sponge. D) One cell functioned as the nucleus for each organism, thereby attracting only cells of the same pigment.
When plasmids are used to produce a desired protein, the ________
A) plasmids multiply and produce the protein outside of the bacterium B) bacterial chromosome is genetically engineered, and the plasmid is used to help the bacterium replicate C) desired gene is inserted into the plasmid, and the plasmid is taken up by the bacterium D) bacterial genome and plasmid are inserted into the genome of the cell containing the desired gene
When one atom loses an electron to another atom, it results in the formation of
A. many hydrogen bonds. B. a polar covalent bond and a new molecule. C. a nonpolar covalent bond that is difficult to break. D. cations and anions that can form ionic bonds. E. a covalent bond between the two.
The set of nucleotides on a tRNA that base-pairs with nucleotides on an mRNA is the:
A) template. B) anticodon. C) primary transcript. D) codon. E) P site.