The major macromolecules of the ECM are _____

A. polysaccharides and proteins.
B. polysaccharides and fat.
C. fat and nucleotides.
D. nucleotides and proteins.
E. fat and proteins.


A. polysaccharides and proteins.

Biology & Microbiology

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One difference between sieve-tube cells and vessels is that sieve-tube cells are ________, but vessels are dead.

A. hollow B. alive C. nucleated D. more spherical E. placed end to end

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Without _____, humans might have a tail

a. differentiation b. epigenetics c. cell migrations d. apoptosis e. the maternal gene effect

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Transcription of structural genes in an inducible operon _____

A) occurs continuously in the cell B) starts when the pathway's substrate is present C) starts when the pathway's product is present D) stops when the pathway's product is present

Biology & Microbiology

In contrast to alpha radiation, beta radiation:

A) is easily stopped by a piece of paper. B) travels slowly and is less penetrating. C) can easily penetrate the human body. D) requires a layer of clothing to stop it.

Biology & Microbiology