Which of the following is an adaptation to land characteristic of gymnosperms but not ferns?
a. seeds
b. spores
c. vascular system
d. alternation of generations
e. flowers
A; Ferns and gymnosperms both have spores, vascular systems and alternation of generations. Neither have flowers. Gymnosperms have seeds whereas ferns do not.
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Biochemical tests are used to determine
A. nucleic acid-base composition. B. enzymatic activities. C. amino acid sequences. D. staining characteristics. E. All of the answers are correct.
Which of the following statements describe a reason ribosomal genes are useful for comparing evolutionary relationships among organisms?
A. There are many differences in these genes, even among closely related species. B. All organisms possess these genes and they can be compared with each other. C. These are the only genes that have been sequenced for every organism on Earth. D. Ribosomes of prokaryotes and eukaryotes are identical. E. It is possible to compare the large subunit genes with the small subunit genes.
The _____ circuit carries blood to and from lungs
Fill in the blank(s) with correct word
Four of the five answers listed below are related conditions in which abnormal numbers of
chromosomes are present. Select the exception. a. monosomy b. Down syndrome c. nondisjunction d. complete chromosome set e. trisomy