What is represented by the difference between the lowest and highest values on the x-axis of a normal distribution curve for the population that is being studied?
A) bell-shaped curve
B) mean value
C) variance
D) frequency distribution
C
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In the avian and mammalian eye, the lens remains stationary but changes shape in order to focus on objects at various distances. This is called "accommodation" and is accomplished through adjusting muscle control of the lens in order to
A. alter the sensitivity of the eye to varying light levels. B. control the amount of light admitted to the eye through the pupil. C. bend light rays to varying degrees according to the angle at which light enters the eye. D. convert light energy into electrical signals by the retina. E. regulate the vitreous humor volume.
In eukaryotes, precursor mRNA molecules are processed in the
A) ribosomes. B) nucleus. C) mitochondria. D) cytoplasm. E) nucleolus.
Net primary production is
A) energy made by autotrophs minus energy consumed by heterotrophs, and measured as biomass. B) heterotrophic production minus autotrophic production per unit of land per unit of time. C) heterotrophic production per unit of land per unit of time. D) energy stored by secondary consumers from primary biomass. E) energy that photosynthetic organisms make available to other organisms over a given period of time.
The cell walls of fungi contain:
A) cellulose. B) phospholipids. C) chitin. D) DNA.