What soil composition would be best for availability of nutrients, water, and root development?
A) equal amounts of sand, clay, and humus
B) higher proportion of humus, lower amounts of clay and sand
C) higher proportion of clay, lower amounts of humus and sand
D) higher proportion of sand, lower amount of humus and clay
Answer: B
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Why do flatworms move away from light sources?
A. to avoid skin cancer B. to avoid the mutagenic effects of direct sunlight C. to hide from predators D. their prey are always found in dark environments
Proteins are essential parts of all structures and biological processes in cells
a. True b. False Indicate whether the statement is true or false
The first event in photosynthesis is the:
a. movement of hydrogen ions through ATP synthases b. donation of electrons from a photosystem to an electron transfer chain c. fixation of carbon dioxide d. breakdown of the thylakoid membrane e. formation of phosphoglyceraldehyde
Which type of neuron is found only in the brain and spinal cord?
A) motor neuron B) sensory neuron C) interneuron D) glial cell