What type of inheritance pattern does achondroplasia exhibit?
a. Autosomal recessive
b. Autosomal dominant
c. X-linked recessive
b
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A student dispensed three identical samples of closed circular DNA to three test tubes. Tube A served as a control. Both tubes B and C received equal amounts of type I topoisomerase; however, the reaction in tube C was allowed to incubate longer
When the contents of all tubes were run on a gel, all tubes showed supercoiled DNA with equally minimal amounts of relaxed DNA. The best conclusion the student should make is that the topoisomerase: A. catalyzed the reaction so efficiently, the extra time for tube C wasn't required. B supercoiled the DNA efficiently. C. the topoisomerase relaxed the DNA efficiently. D. was denatured and not working properly. E. was type II, not type I.
The first cell of a new individual is the
a. blastula. b. gastrula. c. embryo. d. zygote. e. gamete
Which eye disease is characterized by a pannus forming over the cornea?
A. Keratitis B. River blindness C. Trachoma D. Simple conjunctivitis E. Stye
Which of the following scientists was part of a pair who first discovered that cellular reactions can be catalyzed by a ribozyme?
A) Alexander Oparin B) Sidney Altman C) Stanley Miller D) Francisco Redi E) John Tyndall