The leading hypothesis for the origin of the jaw proposes that ______.

A. it resulted from mutations in the developmental regulatory genes that determine the morphology of the rudimentary vertebral elements
B. it first occurred in the hagfish and the lamprey
C. it first occurred in the early tetrapods
D. it resulted from mutations in the developmental regulatory genes that determine the morphology of the gill arches


Ans: D. it resulted from mutations in the developmental regulatory genes that determine the morphology of the gill arches

Biology & Microbiology

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Spring has sprung and so has your garden. Cleaning out the beds in preparation can be tiring but rewarding. The day after doing so, you realize you received an extra reward this year because your skin is covered in itchy, red, swollen blisters. Poison ivy is characterized as which of the following?

a. immediate hypersensitivity b. immunodeficiency c. delayed hypersensitivity d. autoimmune reaction

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Four of these five environments are examples of microclimates. Select the exception

a. a fallen log on the forest floor b. the space under a rock c. a moist, shady forest d. the sunny side of a rock wall e. a crack in a sidewalk

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In what way will the discipline called metagenomics contribute to human health and welfare?

What will be an ideal response?

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The stalk of Caulobacter increases in the surface area of the cell, which facilitates absorption of nutrients from nutrient poor environments.

Answer the following statement true (T) or false (F)

Biology & Microbiology