Which of the following is a possible reason why DNA uses thymine instead of uracil?
A. Thymine is more stable than uracil.
B. Cytidine is deaminated to uracil so it would be difficult for any repair mechanism to differentiate between uracil that belongs in the sequence and uracil that resulted from deamination.
C. Adenine is deaminated to uracil so it would be difficult for any repair mechanism to differentiate between uracil that belongs in the sequence and uracil that resulted from deamination.
D. When uracil is bound to a deoxyribose it will become more reactive, forming covalent bonds with other bases.
E. None of these choicesis correct.
B
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A. In the chloroplasts B. In the mitochondria C. In the airways of the respiratory system D. In the nucleus
Mendel would not have seen four different
phenotypes in the F2 generation of his dihybrid crosses if a. the genes were on the same chromosomes. b. the P1 generation was homozygous. c. purple was dominant to white. d. more than two traits were traced. e. all of these are true.
Which cross shows both parents having two different alleles for each of two different genes?
A) AAbb × aaBB B) aabb × AABB C) AaBb × AaBb D) AaBB × AABb
Which model did scientists develop to describe the cell membrane?
A.) phospholipid model B.) dynamic model C.) fluid mosaic model D.) transport model