Which type(s) of mutation might lead to a threonine auxotrophic revertant?
A. Base substitution
B. Missense mutation
C. Point mutation
D. All of the choices are correct.
Answer: D
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In a four-chambered heart, which of the
following would have the thickest muscle?
a. right atrium b. left atrium c. right ventricle d. left ventricle e. both ventricles would have equally thicker muscle than the atria
In what structure does inhaled air complete its path to the lungs?
A) Bronchi B) Bronchioles C) Glottis D) Alveoli E) Larynx F) Pharynx
Conidia are asexual spores
____________________ Indicate whether the statement is true or false.
Which of the following can serve as a direct source of nitrogen for plants?
A. nitrogen gas in the air B. amino acids in dead organisms C. ammonia from the decomposition of dead organisms D. denitrifying bacteria in the soil