Bacteria are grown in 15N (heavy) medium and then transferred to 14N (light) medium and allowed to replicate for 2 generations. The DNA is subsequently isolated and centrifuged in a CsCl2 gradient to yield what type of gradient band(s)?
A. one heavy band
B. one light band
C. one half-heavy (intermediate to heavy and light) band
D. one heavy and one half-heavy band
E. one light and one half-heavy band
E. one light and one half-heavy band
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To understand the population structure biologists conduct studies to determine all below except
a. population size. b. age. c. ocean conditions. d. sex ratios. e. growth rate.
A hormone produced by fat cells appears to regulate the amount of food consumed, and imparts the feeling of satiety. Name this hormone
a. secretin b. glucagon c. leptin d. srY e. FSH
Abnormal cell division that does not pose a
threat to surrounding tissues are termed
a. malignant. b. benign. c. metastatic. d. carcinogenic. e. repressed
Which type of medium suppresses the growth of unwanted bacteria and encourages growth of desired microbes?
A. differential media B. complex media C. selective media D. enrichment media