Which of the following is true of plant cells?
A) Plant cells may contain chloroplasts.
B) Plant cells are always much larger than animal cells.
C) Chromosomes are found only in plant cells.
D) Only plant cells have a cell membrane.
E) The plant cell has no cell wall.
Answer: A
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Water distribution systems contain
A) very few bacteria or other microorganisms. B) biofilms that may harbor opportunistic pathogens. C) numerous grazing protists that consume bacteria. D) biofilms that may harbor opportunistic pathogens and numerous grazing protists that consume bacteria.
Which of the following distinguishes terrestrial biomes from one another?
a. Plant diversity b. Precipitation c. Mountain ranges d. Animal diversity
What shape park is preferable for minimizing edge effects?
A. jagged B. square C. linear D. oblong E. rectangular
Assume that investigators crossed a strain of flies carrying the dominant eye mutation Lobe on the second chromosome with a strain homozygous for the second chromosome recessive mutations smooth abdomen and straw body. The F1 Lobe females were then
backcrossed with homozygous smooth abdomen, straw body males, and the following phenotypes were observed: smooth abdomen, straw body 820 Lobe 780 smooth abdomen, Lobe 42 straw body 58 smooth abdomen 148 Lobe, straw body 152 What is the coefficient of coincidence? A) 0.33 B) zero C) 0.75 D) 0.5 E) 0.25