Which endocrine gland is the main center for control of the internal environment?

A. Pineal
B. Hypothalamus
C. Thyroid
D. Adrenal cortex
E. Thalamus


Answer: B

Biology & Microbiology

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In 1882, the tropical volcanic island Krakatoa

exploded and was reduced to an abiotic island covered by a thick layer of volcanic ash. By 1933, populations of all of the following organisms were present. Which population was probably established after the others? a. ferns b. bacteria c. insects d. rodents e. mosses

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In eukaryotic cells, steroid hormones

A) bind to cytoplasmic receptors, are transported to the nucleus, bind DNA, and regulate gene expression. B) bind to cell surface receptors and send signals that result in regulation of genes in the nucleus. C) act as enhancers and bind to an assortment of activators and repressors. D) methylate DNA to regulate gene expression. E) cause maternal effect.

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What type of medium provides the best opportunity for growing and observing the morphology of isolated colonies?

What will be an ideal response?

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©McGraw-Hill EducationAssume that the ancestor of this phylogeny had vascular tissue and chlorophyll. If this is true, which answer lists all key traits of a ginkgo?

A. needles, tree, and seeds B. tree and seeds C. seeds, tree, vascular tissue, and chlorophyll D. vascular tissue, needles, tree, and chlorophyll

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