In 1880, Walther Flemming identified ________, threadlike bodies seen in dividing cells
Fill in the blank with correct word.
Answer: chromosomes
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A species that has population levels so low it
faces extinction in all or part of its range is designated as a. riparian. b. endemic. c. endangered. d. fragmented. e. an indicator
Insects and humans are both categorized as animals. Describe how insects' respiratory system, circulatory system, and digestive system differ from humans.
What will be an ideal response?
In the fall, leaves of most deciduous trees change color. This color change takes place when the chlorophyll in the cells breaks down and the other pigments become visible as the green color fades. What is the purpose of the other pigments within a plant cell?
A) The other pigments are waste products of cellular activities and are stored within the vacuoles of the cells. B) The other pigments assist in absorbing specific wavelengths of light for photosynthesis. C) The other pigments are used in the dark reaction of photosynthesis. D) The other pigments are for color only and assist in camouflage.
Consider a culture medium on which only gram-positive organisms such as Staphylococcus aureus colonies can grow due to an elevated NaCl level. A yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the pH as a result and changing the color of a pH indicator chemical. This type of medium would be referred to as a(n)
A) selective medium. B) differential medium. C) enrichment culture. D) selective and differential medium. E) differential and enrichment culture.