Which of the following is(are) totipotent? (Select all correct choices.)

A. the fertilized egg
B. cells of the inner cell mass
C. cells of the ectoderm
D. cells of the endoderm
E. cells of the mesoderm


A

Biology & Microbiology

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Which of the following are examples of proteins encoded by oncogenes?

A. genome integrity proteins B. transcription factors C. DNA repair enzymes D. intracellular signaling proteins E. growth factor receptors

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What term describes an innate response to a simple and specific stimulus?

a. imprinting b. instinct c. learned behavior d. habituation e. a conditioned response

Biology & Microbiology

anion or cation? potassium

What will be an ideal response?

Biology & Microbiology

The first successful land plants, even though they lacked vascular tissue, were the

A. mosses. B. coniferous trees. C. ferns. D. liverworts and hornworts.

Biology & Microbiology