Humans can digest starch but not cellulose because

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#Question id: 12030

#Unit 7. System Physiology – Animal

A significant contribution of intestinal bacteria to human nutrition is the benefit of bacterial:

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#Question id: 2269

#Unit 2. Cellular Organization

The rough ER is so named because it has an abundance of _______________ on it.

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#Question id: 23696

#Unit 13. Methods in Biology

which of the following best describes the complete sequence of steps occurring during every cycle of PCR?

1. The primers hybridize to the target DNA.

2. The mixture is heated to a high temperature to denature the double stranded target DNA.

3. Fresh DNA polymerase is added.

4. DNA polymerase extends the primers to make a copy of the target DNA.

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#Question id: 24664

#Unit 2. Cellular Organization

Which of the following membrane protein do not bind with lipid and, once purified, behave like water-soluble proteins?

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#Question id: 3374

#Unit 11. Evolution and Behavior

Consider an autosomal locus with two alleles A1 and A2 at frequencies of 0.6 and 0.4 respectively. Each generation, A1 mutates to A2 at a rate of μ = 1 x 10-2 while A2 mutates to A1 at a rate of υ = 1 x 10-1) Assume that the population is infinitely large and no other evolutionary force is acting. The overall change in allelic frequency will be