The traffic lights at three different road crossing change after every 48 sec , 72 sec, and 108 sec. Respectively . If they all change simultaneously at 8 : 20 : 00 hours , then at what time will they again change simultaneously ?

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#Question id: 15190

#Unit 8. Inheritance Biology

The recessive mutant allele that causes cystic fibrosis is much more frequent in Caucasians population than in other world populations. Some scientists believe heterozygotes must have had a survival advantage during plagues such as cholera that occasionally swept through this population. What concept does this illustrate?

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#Question id: 11236

#Unit 9. Diversity of Life Forms

Which two structures play direct roles in permitting bacteria to adhere to each other, or to other surfaces?

1.  capsules

2.  endospores

3.  fimbriae

4.  plasmids

5.  flagella

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#Question id: 160

#Unit 1. Molecules and their Interaction Relevant to Biology

Of the 20 standard amino acids, only ___________ is not optically active.  The reason is that its side chain ___________.

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#Question id: 5817

#Unit 8. Inheritance Biology

Why is alkyltransferase only able to be used once?

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#Question id: 23783

#Unit 7. System Physiology – Animal

Retinal is parallel to the surface of the membrane and is attached to a