If an organism is missing the outer layer of skin upon birth, which of the following might be the cause?

A) improper development of the mesoderm
B) improper development of the ectoderm
C) improper development of the endoderm
D) improper development of the endoderm and the mesoderm


Answer: B

Biology & Microbiology

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Antigens specifically associate with an antibody's

A. hinge region. B. heavy chain constant regions only. C. variable regions of the heavy chains and light chains combined. D. light chain variable regions only. E. tail.

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In some fruit flies, an inversion involving the white-eyed locus (w) moves the w+gene from one end of the X chromosome to a location nearer to the centromere. Flies with a w+ or w+/w genotype are normally expected to have red eyes

However, in flies with the inversion, the eyes are mottled red and white. Explain why.

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You sprain your ankle at a roller derby practice. How would you treat your injury?

A) Use ice only because it will reduce swelling and increase blood flow to aid healing. B) Just leave it alone. Ice and heat both make the injury worse. C) First use ice to reduce swelling, and then use heat much later to aid healing. D) First use heat to aid healing, and use ice later to reduce swelling.

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Which of the following is produced by fermentation?

A) beef jerky B) pasteurized milk C) pepperoni D) mozzarella cheese E) pepperoni and mozzarella cheese

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