Gap junctions
A. are slender threads of cytoplasm that link adjacent plant cells.
B. are tiny channels between adjacent animal cells.
C. require a lock-and-key fit between a receptor and a message molecule.
D. are found in both animal cells and plant cells.
Answer: B
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How many grams of water vapor per kilogram of air would you need to add to bring the humidity up to 50% at 21°C, if the air initially had 1.8 g/kg of water vapor
This question show how relative humidity changes as cold, dry outside air is brought inside and warmed. Figure 12.1 shows that as air warms, the maximum specific humidity increases. Therefore, if the air warms but the amount of water vapor stays the same, its relative humidity decreases. Because of this, many people who live in climates with cold winters use humidifiers in their homes to make the air more comfortable. Building engineers recommend that for optimal comfort, inside air should be 21°C, with 50% relative humidity. What will be an ideal response?
Use your knowledge of plate boundaries to answer whether an earthquake is likely or unlikely to occur at the location of the red circle.
A. likely B. unlikely
What is a fossil?
A) Evidence of past life that can include skeletal as well as trace material B) Only the hard parts of a skeletal structure that have been preserved C) Mudcracks preserved in sedimentary rock D) A really old geologist
Salinization of soil is most widely caused by
a. people irrigating farms with ocean water. b. too much rain in tropical areas. c. farmers incorporating salt into their fertilizer. d. evaporation in arid climates pulling salt up from lower soil horizons.