The following events occur when a mammalian immune system first encounters a pathogen. Which shows the correct sequence in which they occur?

I.   Pathogen is destroyed.

II.  Lymphocytes secrete antibodies.

III. Antigenic determinants from pathogen bind to antigen receptors on lymphocytes.

 IV.  Lymphocytes specific to antigenic determinants from pathogen become numerous.

V.   Only memory cells remain.

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#Question id: 32216

#Unit 2. Cellular Organization

In which of the following oligosaccharides, after trimming, no new sugars added to them in the Golgi apparatus?

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#Question id: 4802

#Unit 8. Inheritance Biology

Why is tetrad analysis useful for studying genetics?

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#Question id: 2074

#Unit 2. Cellular Organization

In some cells, there are many ion electrochemical gradients across the plasma membrane even though there are usually only one or two proton pumps present in the membrane. The gradients of the other ions are most likely accounted for by:

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#Question id: 1841

#Unit 4. Cell Communication and Cell Signaling

The circulation of a 2-month-old breast-fed baby will contain maternal:

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#Question id: 7454

#General Aptitude

What is the angle between the minute and hour hand of a clock at 7 : 35 ?