Conditional knock-out organisms provide which advantage over full knock-out organisms?
A) They allow scientists to study genome size.
B) They allow scientists to turn the gene off at any time during the organism's development.
C) They allow scientists to turn on the gene at any time during the organism's development.
D) They allow scientists to render the organism unconscious at any time.
Answer: B
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The main evolutionary advantage of sexual over asexual reproduction is that it produces _____
a. more offspring per individual b. more variation among offspring c. healthier offspring
The work of Oswald Avery, George Beadle, Edward Tatum and many others into the role of DNA laid the foundations of (microbial genetics/microbiology/recombinant DNA technology)
What will be an ideal response?
A researcher decides to test the scientific validity of the common phrase "An apple a day keeps the doctor away." What would be a valid hypothesis to investigate this specific question?
A. The daily consumption of a single apple does not change the number of visits to the doctor. B. Eating one apple every day is good for you. C. Those who consume apples have longer lifespans than those who do not consume apples. D. Eating apples decreases the frequency of contracting a cold. E. Apples are high in vitamin C.
Microbes that dominate environments where organic matter is sparse are called what?
a. oligotrophs b. chemolithotrophs c. autotrophs d. hypoorganotrophs