A testcross is
A) a mating between an individual of unknown genotype and an individual homozygous recessive for the trait of interest.
B) a mating between an individual of unknown genotype and an individual heterozygous for the trait of interest.
C) a mating between two individuals heterozygous for the trait of interest.
D) a mating between two individuals of unknown genotype.
Answer: A
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A. energy production. B. electron transport. C. provision of carbon skeletons for biosynthesis of cell components. D. energy production and provision of carbon skeletons for biosynthesis of cell components.
Why do photosynthetic microbial mats assemble in the way they do (in terms of green bacteria, purple bacteria, cyanobacteria, and sulfate reducers)? Be sure to explain why the species assemble in the order they do (from top to bottom) and why the layers of different species may be more or less thick compared to others.
What will be an ideal response?
The Kirby-Bauer test uses an agar surface seeded with the test bacterium, and small discs containing a specific concentration of several drugs are placed on the surface.
Answer the following statement true (T) or false (F)
Which of the following is NOT necessary to "see" an object?
Select one: a. retina b. optic nerve c. frontal lobe of the cerebrum d. nerve impulse e. bipolar cells