Steroid hormones can trigger gene expression in a select number of cells because ____
a. only target cells allow the steroid hormone to cross the plasma membrane
b. nontarget cells have a steroid hormone response element encoded in their DNA
c. only target cells have the correct receptor in their cytosol to bind to the hormone
d. nontarget cells lack the genes found in target cells
e. only target cells have the genes that steroid hormones activate
ANSWER: c
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Prolactin stimulates mammary gland growth and development in mammals and regulates salt and water balance in freshwater fish Many scientists think that this wide range of functions indicates that prolactin _____
A) is a nonspecific hormone B) has a unique mechanism for eliciting its effects C) is an evolutionarily conserved hormone D) is derived from two separate sources E) interacts with many different receptor molecules
Which of the following is derived from the ground tissue system?
A) root hair B) cuticle C) periderm D) pith E) phloem
The recessive phenotype of a trait occurs in 16% of a population. What is the frequency of the dominant allele?
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What factors are important in making it possible to cool yourself by sweating? (2)
What will be an ideal response?