Which statement below characterizes metabolic pathways?
a. They are a random sequences of reactions.
b. They are always biosynthetic.
c. They are always degradative.
d. They are enzyme-mediated sequences of reactions.
e. They are always linear reactions.
ANSWER: d
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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.
When an animal's involuntary response to a stimulus becomes associated with another stimulus presented at the same time, this is called ________
a. observational learning b. operant conditioning c. habituation d. classical conditioning
The multifactorial threshold model is helpful in genetic counseling to predict recurrence risks. Indicate whether the statement is true or false
With which organelle(s) do chloroplasts share many similarities?
a. the lysosomes b. the rough endoplasmic reticulum c. the mitochondria d. the nucleus