Select all innate immune defenses that are considered to be physical barriers.
Answer:
- Intact Skin
- Mucous membranes in the digestive tract
- ciliated epithelial cells in the trachea
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Amyloid plaques are routinely found in the brains of individuals affected by _____________________, where they cause nerve cell degeneration and death
Fill in the blank(s) with correct word
Copyright© The Mc-Graw-Hill Companies,Inc, Permission Required for reproduction or display.Based on a variety of experiments, it is known that the rate of photosynthesis is highest when wavelengths of light between 400 and 500 nm are used, and when wavelengths around 700 nm are used. What does this indicate about the relative importance of chlorophyll a and b in photosynthesis?
A. Reflection of light by chlorophyll a and b is essential for the process of photosynthesis B. Absorption of light by chlorophyll a and b is essential for the process of photosynthesis C. Transmission of light by chlorophyll a and b is essential for the process of photosynthesis D. Chlorophyll a and b are much less important than other pigments in the reflection, absorption and transmission of light relevant to photosynthesis
During the Pleistocene era, many large mammal species went extinct. Their permanent disappearance occurred in a short period of time when humans were expanding across North America. In this situation, how do many scientists view humans?
A) as a threatened species B) as a density-independent factor C) as an invasive species D) as a biological control agent
Protists move by
A. flagella. B. pseudopods. C. cilia. D. gliding mechanisms. E. All the choices are correct.