Which option correctly lists the sequence in which most animals develop?
A) zygote, cleavage, blastula, gastrula, organ formation
B) cleavage, zygote, gastrula, blastula, organ formation
C) zygote, cleavage, gastrula, blastula, organ formation
D) zygote, cleavage, organ formation, blastula, gastrula
Answer: A
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The fate of the embryonic germ layers is:
A. The endoderm forms the gut, the ectoderm forms the epidermis and parts of the nervous system, and the mesoderm forms muscles and most internal organs. B. The endoderm forms the gut, the ectoderm forms the reproductive tract and endocrine system, and the mesoderm forms muscles and most internal organs. C. The endoderm forms the inner part of all internal organs, the mesoderm forms the middle parts, and the ectoderm forms the outer coverings. D. The layers are sequential structures that all disappear during development, with the endoderm appearing first and then is replaced by the mesoderm, which in turn is supplanted by the ectoderm. E. The endoderm is an embryonic structure that disappears early, whereas the ectoderm persists as the skin and the mesoderm as the internal organs.
The first example of an antimicrobial drug synthesized in the laboratory was
A. penicillin. B. sulfa. C. erythromycin. D. Salvarsan.
The branch of science that deals with the naming and grouping of organisms is known as
A) histology. B) molecular biology. C) chemistry. D) taxonomy. E) ecology.
In last week's lab we proposed that one of the three components of an ink line might lead to termite's orientation behavior: indentation, color, and the chemicals in the ink. Which of the following design would be most helpful to test whether the color of the ink affects termite orientation behavior?
A. Test black BIC pen circle marking with black BIC pen triangle marking B. Test different color BIC pens C. Test black BIC pen markings with extra indentation from wooden sticks D. Test black BIC pen markings with black pencil marking