What is the difference between a food chain and a food web?
What will be an ideal response?
A food chain is in a straight line to indicate which species eat which other species. Rarely in nature is
any relationship between organisms in a community that simple. A food web shows the interwoven
relationships between species, because most organisms have more than one food source.
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Rice and its grain relatives, maize, barley, and wheat, diverged from a common ancestor 50 million years ago. However, the chromosomes of these plants demonstrate extensive conserved arrangements of segments. This phenomenon is called
A. linkage disequilibrium. B. single nucleotide polymorphisms. C. contig. D. synteny. E. expressed sequence equilibrium.
The cytoskeleton and motor proteins are important for which of the following processes?
A. cell motility B. whipping motion of sperm flagella C. movement of amoeba by lamellopodia D. muscle contraction E. All of the choices are correct.
The first step of the scientific method is to
a. ask a question. b. construct a hypothesis. c. observe carefully. d. formulate a prediction.
Free radicals contain unpaired electrons in their outermost energy shell, so they react readily with other atoms or molecules to reach a more stable state. Which of the following could potentially be a free radical?
A) Magnesium (atomic number 12 ) B) Neon (atomic number 10 ) C) Helium (atomic number 2 ) D) Fluorine (atomic number 9 )