Wilting of a plant occurs:
a. if the plant cell walls weaken
b. when osomotic pressure is reached
c. if there is turgor
d. when soil water becomes hypotonic
e. when soil water becomes hypertonic
e
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The extraembryonic membrane that secretes fluid around the developing embryo is the ____
a. allantois b. amnion c. chorion d. yolk sac e. both the allantois and the yolk sac
The cardiac muscle tissue is called the ________
A) pericardium B) myocardium C) endocardium D) coronary chamber
The cell walls of bacteria, fungi, and plant cells and the extracellular matrix of animal cells are all external to the plasma membrane. Which of the following is a characteristic common to all of these extracellular structures?
A) They must block water and small molecules to regulate the exchange of matter and energy with their environment. B) They must provide a rigid structure that maintains an appropriate ratio of cell surface area to volume. C) They are constructed of polymers that are synthesized in the cytoplasm and then transported out of the cell. D) They are composed of a mixture of lipids and nucleotides.
Answer the following questions true (T) or false (F)
1. The brain and the spinal cord make up the central nervous system (CNS). 2. Any nerve that carries messages from the brain and spinal cord is an afferent division of the PNS. 3. Voluntary movement of the legs is controlled by the somatic nervous system.