Describe the different distinct forms that regions of proteins can have. Why are these forms so important?
What will be an ideal response?
Alpha-helical protein regions are shaped like a spiral staircase and provide rigidity to the protein. Pleated sheet regions give the protein flat, box-like sides. Connecting these two types of regions are disordered loops. The relative positions of these protein regions determine the protein's unique shape, essential for the function of the protein.
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Which of the following is NOT a component of DNA?
a. deoxyribose b. phosphate c. adenine d. uracil e. guanine
The mutant fly in Figure 17-2 illustrates all of the following except:
a. the existence of homeotic genes in Drosophila.
b. the concept of nuclear equivalence.
c. mutations in genes affecting segment identity.
d. an altered phenotype due to a mutant allele.
e. a structure containing many nuclei residing in a common cytoplasm
Which are evolutionary modifications that improve the survival and reproductive success of an organism?
a. mutations b. adaptations c. artificial traits d. homoplastic traits e. vestigial structures
The contractile vacuole of Paramecium functions in what role?
a. Feeding b. Locomotion c. Reproduction d. Water regulation e. Defense