if an individual has only one α gene, the excess β chains form the unusual tetramer b4, which causes

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#Question id: 15446

#Unit 4. Cell Communication and Cell Signaling

Hyper IgM syndrome caused by mutation in?

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#Question id: 11746

#Unit 6. System Physiology – Plant

Sieve element sap is rich in sugars and other organic molecules, These molecules represent an energy investment for the plant. How their loss be prevented when sieve elements are damaged?

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#Question id: 5284

#Unit 8. Inheritance Biology

DNA from a strain of Bacillus subtilis with genotype a+b+ c+d+ e+ is used to transform a strain with genotype a - b- c- d-   e-. Pairs of genes are checked for co-transformation and the following results are obtained:

Pair of co-transform genes as follow

D-E,             E-C,                C-B,                  A-D

On the basis of these results, what is the order of the genes on the bacterial chromosome?

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#Question id: 12719

#Unit 6. System Physiology – Plant

Which of the following is a key enzyme in the proline biosynthetic pathway?

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#Question id: 32371

#Unit 2. Cellular Organization

Which of the following is INCORRECT regarding the minimal requirements for Listeria motility?