The most advanced stone tools were made by:

a. Homo habilis.
b. Homo erectus.
c. Neandertals.
d. Cro-Magnons.
e. Homo africanus.


D

Biology & Microbiology

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The rate of transcription for any one gene in any given cell type is determined by only one transcription factor

A. true B. false

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When a cell secretes a growth factor that binds to receptors on its own membrane preventing it from proliferating, this is an example of ____.

A. direct intercellular signaling B. endocrine signaling C. contact-dependent signaling D. paracrine signaling E. autocrine signaling

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The members of a homologous pair of chromosomes

a. are identical in size and appearance. b. contain identical genetic information. c. separate to opposite poles of the cell during mitosis. d. are found only in haploid cells. e. are present only after the S phase.

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Even though they were developed over 100 years ago, Koch's postulates can be used to study all infectious diseases of humans.

a. true b. false

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