A reproductive difference between sea urchins and humans is _____
A) the sea urchin egg completes meiosis prior to fertilization, but meiosis in humans is completed after fertilization
B) sea urchin eggs and sperm are of equal size, but human eggs are much bigger than human sperm
C) sea urchins, but not humans, have a need to block polyspermy, because only in sea urchins can there be more than one source of sperm to fertilize the eggs
D) sea urchin zygotes get their mitochondria from the sperm, but human zygotes get their mitochondria from the egg
A
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Given that multiple diverse phyla (e.g. diverse phylogenetic groups) of microorganisms can perform similar functions in ecosystems,
how we might predict the microbial functions performed by a particular organism or in a particular environment without relying on growing all of the microbes in the lab? What will be an ideal response?
The event called the Cambrian Explosion resulted in an abrupt increase in
A. geological activity. B. diversity of major animal groups. C. algal diversity. D. the number of days in the year. E. the amount of fish, of a single species, in the seas.
Which of the following is essential to the process genetic engineering?
A. selective breeding B. sexual reproduction C. random genetic mutations D. recombinant DNA E. artificial selection
Define an ecological footprint.
A. the amount of land a person needs to provide a place to live B. the amount of energy a person needs to meet his/her needs C. the amount of water a person needs to meet his/her needs D. the total amount of resources used by an individual to meet his/her needs E. the amount of food a person needs to eat