How can radial symmetry be an advantage to slow-moving or sessile marine organisms? What will be an ideal response?
Radial symmetry allows equal distribution of senses around the body rather than concentrating sense organs in one direction. It also allows for equal access to potential food
sources coming from any direction.
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Mollicutes, such as Mycoplasma species, are able to colonize mucous membranes and can lead to pneumonia and respiratory tract disease.
Answer the following statement true (T) or false (F)
Put the following methods of contraception in order from most effective to least effective:1. hormone pill 2. female condom 3. spermicide 4. male condom
A. 3,2,4,1 B. 4,3,2,1 C. 1,4,2,3 D. 1,2,3,4 E. 2,3,4,1
The "fight-flight" response is enhanced by secretions
a. from the adrenal cortex. b. known as epinephrine and norepinephrine. c. stored in the pancreas. d. from the kidneys. e. known as acetylcholine.
Which of the following would be the best approach to allow a biologist studying the evolution of four similar species of birds to choose the correct phylogenetic tree from all possible phylogenetic hypotheses?
a. Constructing the tree that connects the species using the fewest number of branches b. Comparing the entire genomes of the species and arranging species within the phylogeny based on genome similarity c. Determining which species can interbreed and concluding that those that can evolved from a common ancestor most recently d. Choosing the tree that has the most evolutionary changes, as this would be the most likely scenario to produce four distinct species e. Constructing phylogenetic trees consistent with DNA sequence comparisons among the species and then choosing the tree that involves the fewest number of evolutionary changes from a common ancestor to the current species