The evolution of saber teeth in a number of groups of extinct carnivorous mammals is an example of
A. homoplasy caused by common descent.
B. homoplasy caused by convergence.
C. homology caused by common descent.
D. homoplasy caused by evolutionary reversal.
E. homology caused by convergence.
Answer: B
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Answer the following statements true (T) or false (F)
1. Prokaryotic genomes often contain a circular chromosome with hundreds of thousands of genes and highly repetitive DNA. 2. In humans, the genome is made up of 22 autosomes and 1 sex chromosome. 3. Some transposable elements contain a central region that encodes transposase, an enzyme that facilitates the actual transposition. 4. If a researcher determines that 25% of a liver cell's total genome encodes genes for metabolic enzymes, then he/she can conclude that metabolic enzymes make up 25% of the total protein composition of the cell. 5. A nerve cell and a muscle cell taken from the same individual would have two different sets of genes.
In mammals, the filtrate leaves the blood by exiting from the
a. efferent arteriole. b. peritubular capillaries. c. renal artery. d. afferent arteriole. e. glomerulus.
what depresses NK cells?
What will be an ideal response?
Which group would be an ecological population of organisms?
A) all chipmunks in a wood lot B) all plants in a garden C) all animals in a zoo D) all plants and animals in a rainforest