Approximately what percentage of the human genome consists of noncoding DNA?
A) 98%
B) 87%
C) 77%
D) 67%
A
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Agricultural lands frequently require nutrient augmentation because _____
A) nitrogen-fixing bacteria are not as plentiful in agricultural soils because of the use of pesticides B) the nutrients that become the biomass of plants are not cycled back to the soil on lands where they are harvested C) land that is available for agriculture tends to be nutrient-poor D) grains raised for feeding livestock must be fortified, and thus require additional nutrients E) cultivation of agricultural land inhibits the decomposition of organic matter
The most commonly used unit for measuring cell size is a ____
a. decimeter (dm) b. centimeter (cm) c. millimeter (mm) d. micrometer (?m) e. nanometer (nm)
Which of the following would protect a plant from water loss on a hot, sunny day?
A. phloem and stomata B. cuticle and stomata C. cuticle and phloem D. stomata E. cuticle
The zona pellucida
A) allows quick passage of the egg down the oviduct. B) bathes the egg in estrogen. C) is another term for the fertilized egg. D) acts as a binding site for the sperm head.