Filter feeders on coastal shelves tend to dominate in areas that have:
a. moving currents and coarse sediments.
b. no currents and fine sediments.
c. silty areas.
d. muddy areas.
A
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DNA gyrase
A. closes gaps between DNA bases. B. removes supercoiling ahead of origin. C. synthesizes RNA primers. D. copies DNA bases.
The conducting tissues of vascular plants are rigid because they contain ________ in their cell walls
Fill in the blank(s) with correct word
A transfer of genes between non-homologous chromosomes is known as
A. crossing over. B. aneuploidy. C. trisomy. D. translocation. E. duplication.
Jess has A- blood type, has never received a blood transfusion, and never been pregnant. Antibodies against what blood antigens could be present in Jess' blood?
A) O and Rh antigens B) B antigens C) A antigens D) B and Rh antigens E) O antigens