Which statements about K are correct?

I) K varies among populations.

II) K varies in space.

III) K varies in time.

IV) K is constant for any given species.

#Question id: 1874

#Unit 4. Cell Communication and Cell Signaling

Which of the following is the single immunodeficiency disease that most profoundly affects CD4-positive T-cells?

#Question id: 1929

#Unit 4. Cell Communication and Cell Signaling

Which of the following is an example of an immune escape mechanism used by some tumor cells?

#Question id: 12807

#Unit 10. Ecological Principles

#Question id: 16096

#Unit 7. System Physiology – Animal

#Question id: 2872

#Unit 2. Cellular Organization

Concerning disorders resulting from unstable expansion of tandem oligonucleotide repeats, which, if any of the following statements is false.

A) The expansions can occur in coding DNA in some cases, and in noncoding DNA in other cases.

B) The repeats are of a variable number of nucleotides (from three to six) in both coding DNA and noncoding DNA.

C) The expansions in noncoding DNA are generally much larger in size than those in coding DNA.

D) The expanded arrays in noncoding DNA always result in loss of function of the host gene or of a neighboring gene.