The xylem primarily transports ________, while the phloem primarily transports ________
A) sugars; water and minerals
B) oxygen and carbon dioxide; sugars
C) water and minerals; sugars
D) water and minerals; oxygen
C
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Phenotype is ____
a. only expressed in a heterozygous organism b. an observable property or expression of a trait in an organism c. the specific genetic constitution of an organism d. the variation of genes e. cannot be determined by knowing genotype
Confronting danger will cause this part of the autonomic nervous system to become active. _____ 2) This is a group of brain structures that helps us to experience feelings such as joy, fear, and anger. ______ 3) This filters sensory input. _____ 4) Tissue located within the brain that allows the left and right cerebral hemispheres to communicate with one another. _____ 5) A tumor here may cause you to eat either too much or too little. _____
A) Autonomic nervous system B) Pons C) Reticular activating system D) Hypothalamus E) Limbic system F) Corpus callosum G) Parasympathetic nervous system H) Sympathetic nervous system I) Thalamus J) Somatic nervous system
Why is it important for signal transduction systems to trigger a rapid response within a cell and be able to be shut down quickly?
-All signal transduction cascades are shut down immediately so as to prevent the cell from mounting a response. -Cells are unable to respond quickly to hormones, and therefore signal transduction cascades always occur over a long time. -Cells have to be able to function alone, because they are unable to work together in a coordinated fashion. -Cells often have to respond very quickly to changes in their internal and external environments.
The use of compartmentation for the simultaneous but independent regulation of anabolic and catabolic pathways occurs generally in eukaryotes but not in prokaryotes.
Answer the following statement true (T) or false (F)