Which of the following is true of the structure of typical transcriptional activators?
A. They contain only one type of motif.
B. The regulatory domain contains the DNA-binding motif.
C. The DNA-binding domain always binds to the coactivator.
D. They contain a regulatory domain that can be functional when separated from the DNA-binding domain.
D
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Select the hormone that is NOT involved in crustacean molting
a. molt-inhibiting hormone b. juvenile hormone c. brain hormone d. ecdysone e. molt-stimulating hormone
In horses, black coat color is influenced by the dominant allele (B), and chestnut coat color is
influenced by the recessive allele (b). Trotting gait is due to a dominant gene (T), pacing gait to the recessive allele (t). If a homozygous black trotter is crossed to a chestnut pacer, (a) what will be the appearance of the F1 and F2 generations? (b) which phenotype will be the most common? (c) which genotype will be the most common? (d) which of the potential offspring will be certain to breed true? What will be an ideal response?
Select the correct sequence of vertebrate development beginning with fertilization.
A. fertilization ? gastrulation ? cleavage ? neurulation ? neural crest formation ? organogenesis B. fertilization ? cleavage ? gastrulation ? neurulation ? organogenesis ? neural crest formation C. fertilization ? neurulation ? gastrulation ? organogenesis ? neural crest formation ? cleavage D. fertilization ? gastrulation ? neurulation ? neural crest formation ? cleavage ? organogenesis E. fertilization ? cleavage ? gastrulation ? neurulation ? neural crest formation ? organogenesis
A good average value for the amount of energy that reaches the next trophic level is about
A. 1%. B. 20%. C. 10%. D. 2%. E. 5%.