What is a common limiting nutrient of phytoplankton?
a. Sunlight
b. Nitrogen
c. None of these choices
d. Oxygen
b
You might also like to view...
Life originated on earth in which of the following distinct phases?
a. formation of small molecules containing carbon and hydrogen b. formation of self-replicating information-containing molecules c. development of a membrane enabling metabolism and creating the first cells d. None of the above is correct. e. All of the answer options are correct.
A natural population of organisms that can produce fertile offspring belong to the same ________
Fill in the blank(s) with correct word
Is sex expected to be more favored in unpredictably changing environments than in predictably changing environments?
a. No, sexual reproduction is favored under any kind of environmental change. b. Yes, but only if the change is temporally predictable. c. Yes, an asexual lineage with the plasticity to deal with the predictable change will outcompete sexuals incurring the cost of sex in a predictable environment. d. B and C.
Which of the following statements about the cell cycle is false?
(a) Once a cell decides to enter the cell cycle, the time from start to finish is the same in all eukaryotic cells. (b) An unfavorable environment can cause cells to arrest in G1. (c) A cell has more DNA during G2 than it did in G1. (d) The cleavage divisions that occur in an early embryo have short G1 and G2 phases.