A normal sperm whose

chromosomes don't contain the sex chromosome that is responsible for life

can fertile a normal ovum and

a. Down's case occurs.

c. fetus death occurs

b. Klinefelter's case occurs.

d. normal male produces.

A student is observing a cell on a microscope slide and notices cell walls and membrane-bound organelles. The student concludes that the cells what?

What difference between bacteria and viruses shows that bacteria are living organisms and viruses are not? A. Only bacteria have DNA with no nuclei. B. Only bacteria can use conjugation. C. Only bacteria reproduce asexually. D.

The diagnostic term fifth disease causes a slight red skin flush similar to:

Which sentence summarizes the water cycle? a) The water on earth changes forms as it moves from one reservoir to another. b) Water in the atmosphere must be converted to another chemical before animals can use it.

How is the shape and function of the central cylinder of a root similar to a water pipe or blood vessel?

In any ecosystem, there are always more: Select one: a. Animals than plants b. Herbivores than carnivores c. Heterotrophs than autotrophs d. Predators than prey

Which biome would contain the most biodiversity in deciduous tree species? A) taiga B) savanna C) temperate forest Eliminate D) tropical rainforest

If you wanted to show all of the feeding relationships in a particular ecosystem, what type of diagram would be most effective

Bacteria, viruses, protozoa, and green algae are all microbes, but one group is much smaller in size than the rest. Which microbe is the smallest? A. a green algae cell B. a bacterium C. a protozoan D. a virus

The discovery of immense ridges and trenches stretching thousands of kilometers across the seafloor in the 1950s led to acceptance of the theory of