Describe the difference between homologous and analogous structures in organisms, and give an example of each
What will be an ideal response?
Homologous structures derive from a common ancestral structure but may not have the same function today. Examples: reptile legs and whale flippers. Analogous structures may have the same function today but are derived from different ancestral structures. They became homologous by convergent evolution. Examples: bat wings and insect wings. Many other examples, other than those given here, are possible.
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Which of the following is not a modification to the mRNA before leaving the nucleus?
A. End capping B. Promoter binding C. Intron removal D. Exon splicing
Which structure, A, B, C, or D, is the developing neural tube?
1.A
2.B
3.C
4.D
The term reproductive isolation mechanism refers to
a. specific areas where males compete or display for females. b. the process by which sexual selection evolves within a population. c. a blockage of gene flow between populations. d. the inability of a species to continue reproduction. e. legal limits to procreation.
Steroids are considered to be lipids because they _____.
A) are essential components of cell membranes B) are not soluble in water C) are made of fatty acids D) are hydrophilic compounds E) contribute to atherosclerosis