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#Question id: 4350


Portions of the DNA sequences of normal and mutant b-globin genes are shown. The most plausible explanation for why the indicated mutation (changing an A to a G) results in the disease b-thalassemia is that the mutation

#Unit 3. Fundamental Processes
  1. changes the amino acid specified by the codon of which the altered base is part

  2. generates a recognition site for a restriction enzyme, so the gene is cut in two

  3. creates a new splice site, so that a portion of the intron is not removed

  4. results in an increase in the transcription of the b-globin gene

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#Question id: 7051

#Unit 5. Developmental Biology

Which of the following is not maternal dorsalizing factors in amphibia?

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#Question id: 32400

#Unit 1. Molecules and their Interaction Relevant to Biology

Pyruvate dehydrogenase kinase is


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#Question id: 8948

#Unit 9. Diversity of Life Forms

What distinguishes a coelomate animal from a pseudocoelomate animal is that coelomates

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#Question id: 12162

#Unit 8. Inheritance Biology

Nilsson-Ehle’s cross obtained homozygous varieties of wheat that differed in color, he crossed a variety of wheat that possessed white kernels with a variety that possessed  red kernels and obtained the following results:

The following conclusions are made from the results obtained;

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#Question id: 3490

#Unit 11. Evolution and Behavior

Given below are some behaviors strategies.

A) Fixed action pattern, complex sequence of behavior, Once released and continuous to completion, even when there is change in surrounding environment

B)  natural selection select that territorial behavior that is benefit is greater than cost 

C) Imprinting, a form of learning in which a very young animal fixes its attention on the first object with which it has visual, auditory, or tactile experience

D) Donor benefits at a cost to the recipient, the behavior is altruistic; when the recipient benefits at a cost to the donor, the behavior is selfish.

Which one of the following correct combination of true and false?