In temperate-zone lakes, a __________ and a fall
overturn cause vertical mixing of waters and trigger a
burst of productivity. Fill in the blank(s) with the appropriate word(s).
Answer: spring overturn
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Energy is commonly defined as “the capacity to do
work.” This definition is a. incorrect. b. adequate in the physical sciences. c. adequate in the biological sciences. d. no more than a clue to the actual properties of the concept. e. not accepted by most scientists.
You have a DNA sequence of 1600 bp. To characterize it, you decide to make a restriction map. Cutting with the first enzyme, you show by electrophoresis that the fragments produced are 400 and 1200 bp, respectively
After using the second enzyme, you recover 700-bp and 900-bp fragments. After treatment with both enzymes, fragments were 300, 400, and 900 bp. Which is the correct map? A) -900 ------/400--/3--- B) -400/--900-----/300 --- C) -300-/--400--/--900---- D) -400-/300-/---900----- E) -400-/-100/--300--/900
The growth rate of a population is expressed as:
a. b ? d. b. i ? e. c. K ? N. d. dN / r. e. (K ? N) / K.
Which of the following statements about group B streptococci is FALSE?
A) They are present in healthy carriers. B) They cause gram-positive sepsis. C) They cause strep throat. D) They cause neonatal sepsis. E) They are classified as Streptococcus agalactiae.