What is the most common source of the extra chromosome 21 in an individual with Down syndrome?
A) nondisjunction in the mother
B) nondisjunction in the father
C) duplication of chromosome 21
D) deletion in either parent
Answer: A
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When does the ? subunit dissociate from RNA polymerase?
A. after promoter clearance B. at the termination of transcription C. immediately after promoter binding D. immediately before promoter binding E. not until the enzyme is degraded
Behavioral responses that animals may or may not use are called facultative
Indicate whether the statement is true or false.
Precipitation can be a significant input of nutrients in ecosystems
Indicate whether the statement is true or false
Which is a description of cauterization?
a. treating a tumor with freezing temperatures b. treating tissue with heat c. drying tissue electrically d. surgical puncture to remove fluid e. removing cells by scraping the walls of an organ