Light enters the eye’s interior through the

__________, an adjustable opening in the center of
the muscular, doughnut-shaped iris. Fill in the blank(s) with the appropriate word(s).


Answer: pupil

Biology & Microbiology

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During transcription elongation, how many pyrophosphate molecules are produced from the incorporation of 20 ribonucleoside monophosphates?

A. 60 B. 40 C. 5 D. 20

Biology & Microbiology

A point mutation that creates a premature stop codon is called a _____

A. synonymous (silent) mutation B. nonsynonymous (missense) mutation C. nonsense mutation D. translation mutation E. transition mutation

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Which group of mammals is the most speciose?

A. Proboscidea (elephants) B. Rodentia (squirrels, rats, mice) C. Perissodactyla (horses, zebras, rhinos) D. Chiroptera (bats) E. Carnivora (dogs, cats, bears, walruses)

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What compound directly provides energy for cellular work?

A) sugar
B) ATP
C) DNA
D) fat

Biology & Microbiology