Which of these traits distinguishes Holocephali from sharks and rays?
a. flattened bodies
b. enlarged pectoral fins
c. a lack of scales
d. swim bladders
c. a lack of scales
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Every 24 hours, every genome in every cell of the human body is damaged 10,000 times or more
Given the possible DNA repair mechanisms, which order listed below would be most effective at repairing these as quickly as possible in order to prevent mutations from being carried forward in DNA replication? A. Proofreading by DNA polymerase, glycosylase enzyme activities, excision repair, SOS repair B. SOS repair, excision repair, glycosylase enzyme activities, proofreading by DNA polymerase C. SOS repair, proofreading by DNA polymerase, glycosylase enzyme activities, excision repair D. Glycosylase enzyme activities, SOS repair, proofreading by DNA polymerase, excision repair
The first step in the scientific method is to
a. identify a problem. b. propose a solution. c. predict the results of an experiment. d. perform an experiment. e. draw a conclusion.
Why was developmental biology left out of the "modern synthesis" of evolution as it developed in the 1930s and 1940s?
A) Many developmental biologists believed that evolution progresses by rapid jumps, not slow and gradual change. B) It was widely felt that development and genetics had to be "properly separated" for either to make any progress. C) Many developmental biologists focused on "structuralist" explanations of evolution. D) The genetic mechanisms of development were poorly understood at the time. E) All of the above.
What is the typical sequence of events in gene expression and protein synthesis?
A) protein > RNA > DNA B) RNA > DNA > protein C) DNA > RNA > protein D) RNA > protein > DNA E) DNA > protein > RNA