Which of the following is not true of the transcription-activation domains of transcriptional activators?
A. Many are composed of acidic, proline-rich, or glutamine-rich regions.
B. They are thought to be relatively unstructured.
C. These domains are likely to interact with DNA.
D. These domains interact with other proteins.
C
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How do primary producers provide energy for the food chain?
A. They break down organic molecules into inorganic elements. B. They make their own organic molecules via photo- or chemosynthesis. C. They receive energy from secondary consumers. D. They pass on organic substances from primary consumers.
Adrenocorticotropic hormone (ACTH) triggers the release of _____ in response to stress.
Fill in the blank(s) with the appropriate word(s).
Microspore mother cells produce microspores. What do microspores then develop into?
A. synergids B. pollen grains C. megaspores D. endosperm E. egg cells
A researcher tracks the escape behavior of a population of squirrels on campus across two generations
When she plots the escape behavior of the offspring generation against the parental behavior, she notes that the offspring's behavior exactly matches the parental behavior. Nonetheless, the narrow-sense heritability equals zero. How can the heritability equal zero in this example? a. The additive genetic variance equals zero. b. All the escape behavior alleles are fixed in the population. c. There is no phenotypic variation. d. A and B. e. All of the above.