Bacterial plasmids
A) confer protective traits such as toxin production and the ability to resist drugs.
B) are essential to growth and metabolism.
C) are always completely separate from the bacterial chromosome.
D) are only passed on to bacterial offspring.
Ans: A) confer protective traits such as toxin production and the ability to resist drugs.
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How does the adaptive immune system differ from the innate immune system?
A. in the ability to distinguish self from nonself B. in having memory C. in the ability to target a specific pathogen D. both in having memory and in the ability to target a specific pathogen
You perform a cell free translation experiment like Nirenberg and Matthaei, but you forget to write down what nucleotides you added to make the mRNA
You precipitate the translated polypeptides and measure the relative amount of radiolabeled amino acids incorporated into them. You get 25% proline, 25% threonine, 12.5% glutamine, 12.5% lysine, 12.5% asparagine, and 12.5% histidine. What nucleotides and in what % did you add to make the mRNA? A. Equal amounts of A, C, U, and G B. 50% C and 50% A C. 70% C and 30% A D. 50% C and 50% U E. 50% A and 50% G
After several generations of selectively breeding mice in a laboratory, Ted Garland and his colleagues established populations of mice that voluntarily chose to run great distances on exercise wheels
The process of establishing these populations of mice is termed ________. A) natural selection B) artificial selection C) population selection D) experimental selection E) random selection
Haemophilus influenzae requires hemin (X factor) to synthesize cytochromes and NAD+ (V factor) from other cells
For what does it use these two growth factors? What diseases does H. influenzae cause?