During the late 1800s, which of these technological developments contributed the most to scientific knowledge of the role played by chromosomes in inheritance?
a. radiocarbon dating
b. early DNA sequencing
c. improvements in microscopy
d. mass spectrometry
c. improvements in microscopy
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When gibberellin binds to its receptor, what happens to activate the gibberellin-dependent transcription factor GA-TRXN?
A. Ethylene is released. B. A ubiquitin tag is used to degrade the GA-TRXN inhibitor. C. A DELLA protein is degraded, freeing the GA-TRXN. D. A DELLA protein is attached to GA-TRXN to activate it. E. The gibberellin is transferred to an alternate binding site.
How can humans perceive multiple sounds at once?
a. Each portion of the basilar membrane vibrates at a unique frequency, and multiple regions can be stimulated at the same time. b. The more frequencies of sounds that are present, the further the sound travels into the cochlea. c. We have two ears, each perceiving a subset of frequencies in the environment. d. The fluid in the middle ear can transmit multiple frequencies to the oval window. e. Sounds reaching the left or right ear result in different nerve impulses.
The tough, pliable body of a lichen is called a(n)
a. soredium. b. arbuscule. c. thallus. d. sporangium. e. haustorium.
Before Linnaeus, scientific names were problematic because they were
a. too brief to be descriptive b. very long and difficult to standardize c. written only in Greek d. written only in Latin