Countercurrent exchange allows for the removal of ____ percent of O2 from water flowing over gills
a. 50?60
b. 60?70
c. 70?80
d. 80?90
e. 90?100
ANSWER: d
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Crossing over occurs during which step in meiosis?
A. prophase 1 B. anaphase 1 C. prophase 2 D. metaphase 1
If a normal diploid germ cell in a bird has eight chromosomes, then
a. there are eight homologous pairs of chromosomes per diploid germ cell. b. there are eight chromatids per diploid germ cell after DNA replication. c. there are four chromosomes per cell after the first meiotic division and cytokinesis. d. sperm cells made from this diploid germ cell would have eight chromosomes. e. there are eight copies of each chromosome in this diploid germ cell.
What is the most common ecosystem on Earth?
a. marine ecosystems b. freshwater ecosystems c. terrestrial ecosystems d. arboreal ecosystems
Which of the following is an application of proteases?
A. cheese B. indigo C. meat tenderizer D. vodka E. wine