Many wild orchids cannot be successfully dug up and transplanted because they need the native mycorrhizae (a fungus) in the soil to survive. What kind of interaction is this?
a. parasitism
b. herbivory
c. mutualism
d. competition
Answer: c. mutualism
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Which of the following is the best description of decomposition?
a. breaking down inorganic molecules such as carbon dioxide and water into organic molecules such as carbohydrates, lipids, and proteins b. building organic molecules such as carbohydrates, lipids, and proteins from inorganic molecules such as carbon dioxide, water, and nitrogen-containing compounds c. building macromolecules from smaller organic molecules d. breaking down organic molecules into inorganic molecules e. a process undertaken by producers in an ecosystem
An untied inflated balloon flies because
a. the pressure is higher inside than outside the balloon. b. the pressure is lower inside than outside the balloon. c. air flows down its pressure gradient. d. both a and c occur.
Electrons generated from the Krebs cycle go next to the ________.
A. fermentation pathway B. electron transport chain C. formation of alcohol D. fluid portion of the mitochondrion
The calcium that triggers muscle contraction is stored in the
A) motor neuron. B) plasma membrane of cells. C) endoplasmic reticulum. D) mitochondria.