A structure with stems and leaves that arise from apical meristems is a ____
a. vascular system
b. protonema
c. sporangium
d. rhizome
e. shoot system
E
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When chromosomes have either duplications or deletions, the chances that the mutation will be harmful are a function of:
A. its sizeâ€"the smaller the duplication or deletion, the greater the chance of harm. B. its sizeâ€"the larger the duplication or deletion, the greater the chance of harm. C. its locationâ€"if it occurs in a germ-line cell, it will be more harmful than if it occurs in a somatic cell. D. its position on the chromosomeâ€"if it occurs at the tip of a long arm, it is likely to be less harmful than if it occurs at the tip of a short arm. E. None of the answer options are correct.
Which mutations can interfere with the proper insertion of a protein in the plasma membrane?
A. A nonpolar amino acid to a polar amino acid within a cytoplasmic domain B. A polar amino acid to a nonpolar amino acid within a transmembrane domain C. A polar amino acid to a nonpolar amino acid within a cytoplasmic domain D. A nonpolar amino acid to a polar amino acid within a transmembrane domain
In sickle cell anemia, the defective hemoglobin differs from the normal hemoglobin by
A. the color of the pigment. B. the size of the molecule. C. a single amino acid substitution. D. the type of blood cell it is found in. E. the total number of amino acids.
In eukaryotes, a promoter that signals the beginning of the gene and binds with the promoter typically consists of
A) rRNA and tRNA. B) the bases TATAAA and response elements. C) the base sequence AUG and transcription factor binding sites. D) both DNA and RNA.