A scientist is studying some developing eggs from an ocean sample. The early embryos have divided only a few times, and all cells look identical. When the scientist carefully removes half the cells from an embryo, both clumps of cells are able to complete development, forming twins. The eggs can be identified as
A. deuterostomes.
B. protostomes.
C. cnidarians.
D. crustaceans.
E. echinoderms.
Answer: A
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Which of the following chemical properties or interactions of purines and pyrimidines does not affect the structure and function of nucleic acids?
A. planar nature of bases due to resonance B. tautomerism of the bases C. absorbance of UV light D. hydrophobic stacking E. base pairing
Four of the five answers listed below are
functions of parenchyma tissue. Select the EXCEPTION.
a. support b. heal wounds c. store food d. conduct photosynthesis e. secretions
Single layer of flat cells
A. Pseudostratified columnar B. Simple columnar C. Simple cuboidal D. Simple squamous E. Stratified squamous F. Transitional
Polymers are made up of _____________.
Fill in the blank(s) with the appropriate word(s).