practice_book_biology

Exons of a gene are defined as a the untranslated

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Unformatted text preview: ne are defined as (A) the untranslated regions of the corresponding mRNA (B) regions in the corresponding mRNA that are involved in initiation of transcription (C) regions that are not transcribed by RNA polymerase (D) regions that are excised from the corresponding protein after it is synthesized (E) regions that remain in the corresponding mRNA after splicing GO ON TO THE NEXT PAGE. Unauthorized copying or reuse of any part of this page is illegal. 18 28. Which of the following is an anticodon? (A) The part of a DNA molecule that codes for chain termination (B) A 3-nucleotide sequence of an mRNA molecule (C) A specific part of a tRNA molecule (D) A nucleotide triplet of an rRNA molecule (E) The portion of a ribosomal subunit that interacts with aminoacyl-tRNA synthetase 29. Drosophila lines with large, sometimes multiple, inversions in one or more chromosomes are often used in maintaining laboratory stocks because of which of the following reasons? (A) Inversions maximize the process of chromosome pairing within and near the inversion. (B) Inversions in the male inhibit fertilization of non-inversion-containing females. (C) Inversion heterozygotes produce a greater number of viable offspring. (D) Inversion heterozygotes usually yield inviable gametes or zygotes when crossing-over occurs within the inversion. (E) Inversion heterozygotes produce a greater number of recombinant offspring. 30. Chimeric mice can be generated by injecting a cell from an early embryo into a blastocyst of another genotype. The fact that the single injected cell can contribute to many tissues of the chimeric mouse has led to the conclusion that cells of the early embryo are (A) (B) (C) (D) (E) differentiated motile transformed transduced totipotent 31. In Drosophila, regions of polytene chromosomes show puffs at different times in development. Studies with labeled compounds have indicated that the localization to the puffs of tritiated (A) thymidine indicates that DNA is being synthesized (B) thymidine indicates that RNA is being synthesized (C) leucine indicates that new proteins are being synthesized (D) uridine indicates that DNA is being synthesized (E) uridine indicates that RNA is being synthesized 32. In Drosophila, a homeotic mutation would be the most likely explanation for which of the following? (A) A decrease in the number of parasegments (B) A leg developing where an antenna would normally be located (C) Forked and dense body bristles instead of straight and sparse ones (D) A significantly shorter life span (E) An increase in wing length 33. Humoral immunity is characterized by all of the following EXCEPT (A) (B) (C) (D) (E) a memory response antigen-antibody interaction the synthesis of immunoglobulins the production of plasma cells the production of cytotoxic T cells GO ON TO THE NEXT PAGE. Unauthorized copying or reuse of any part of this page is illegal. 19 34. The immune system in mammals can rapidly respond to foreign molecules because of the enormous variety of B lymphocytes, each with different cell-surface antibodies that can bind specific antigens. Which of the followin...
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This document was uploaded on 03/16/2014 for the course BIO 1434 at UT Arlington.

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