Research has shown that commercial fisheries place selective pressure on fish populations by
harvesting mostly the ____ fish, resulting in ____.
a. young; aging populations
b. larger; maturity at smaller sizes
c. smaller; maturity at larger sizes
d. prereproductive; declining birth rates
e. postreproductive; no change in population size
B
You might also like to view...
The constituents of the electron transport chain have similar capabilities, with the exception of ubiquinone (coenzyme Q). What is different about ubiquinone?
A) Ubiquinone is a protein that begins the electron transport chain, so it accepts the highest-energy electrons. B) Ubiquinone is a protein that serves as a regulator of the rate of redox reactions in the electron transport chain. C) Ubiquinone is a protein that is a constituent of all cells, prokaryotic or eukaryotic; hence its name, originating from "ubiquitous." D) Ubiquinone is not a protein, is lipid soluble, and can move through the inner mitochondrial membrane.
A microbiologist inoculates Staphylococcus aureus into a culture medium. Following incubation, both Staphylococcus aureus and Staphylococcus epidermidis are determined to be growing in this culture. What is the most likely explanation?
A. The culture was contaminated. B. The culture medium was differential. C. The incubation temperature was incorrect. D. The microbiologist used too much inoculum. E. The culture medium was selective.
A trait that is adaptive in one context and later turns out to have adaptive value in a rather different
context is called
a. paedomorphosis. b. anagenesis. c. cladogenesis. d. exaptation. e. endemic.
One of Chargaff’s rules is _____
a. different organisms have different proportions of adenine and guanine b. the DNA molecule is a double helix c. the two strands in a DNA molecule run in opposite directions d. the backbone of a DNA molecule is on the outside e. the backbone of the DNA is comprised of alternating sugars and phosphates