The smallest functional unit of life is known as a(n) ________
Fill in the blank(s) with correct word
cell
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A scientist measured heritability in yield per acre of a strain of wheat grown on a farm in Eastern Europe and determined that it was 80%. She can therefore conclude that:
A. 80% of variation among individuals when the same strain of wheat is grown in Nebraska will be due to genetic differences. B. 80% of variation among individuals when the same strain of wheat is grown on the same farm the following year will be due to genetic differences. C. when the same strain of wheat is grown on two different farms at the same time, 80% of the average difference in yield per acre will be due to genetic differences among populations. D. All of these choices are correct. E. None of these choices is correct.
In the United States, parathion is the most widely used member of a class of ____
a. organophosphate herbicides b. organophosphate insecticides c. chlorophosphate fungicides d. chlorophosphate herbicides e. chlorophosphate insecticides
A microbiology student with a visual disability is viewing a sample of Bacillus endospores in a phase contrast microscope that is linked to an iPad. By "stretching" the image on the iPad screen, the student can increase the apparent size of the endospores. How does this manipulation affect resolution and contrast? (No software is being used to alter the image!)
A. Resolution and magnification will decrease because the screen is not as good as the human eye. B. Only the magnification can be increased; resolution and contrast are unchanged. C. Both magnification and resolution increase; contrast is unchanged. D. Contrast will improve because the microscope is phase-contrast.
Why can scratching or chipping the seed coat speed up the germination of hard-coated seeds like alfalfa?
A. Bacteria or fungi can enter the seed and release growth factors. B. Carbon dioxide can enter the seed and stimulate photosynthesis. C. The mechanical stress activates hydrolytic enzymes. D. Water and oxygen can enter the seed to reach the embryo more quickly. E. Damage to the seed coat triggers the aleurone layer to release amylase.