What is the competitive exclusion principle?
a. The isolation of groups in a large habitat
b. The number of predators in a given area.
c. The effect of physical factors on consumers.
d. A better competition drives a species to extinction when competing for the same limited resource.
d
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Cilia and flagella (select all correct choices):
A. are specialized cells that move by rotary motion. B. are specialized organelles that move by rotary motion. C. are specialized organelles that propel some plant, algae, and animal cells. D. contain microfilaments arranged in nine pairs around the periphery and two microfilaments in the center. E. contain microtubules arranged in nine pairs around the periphery and two microfilaments in the center.
What distinguishes expression vectors from other cloning vectors?
a. Expression vectors do not have an origin of replication. b. Only expression vectors have origins of replication. c. Expression vectors contain regulatory sequences to allow transcription and translation of an inserted gene. d. Inserted genes cannot be transcribed from an expression vector. e. Expression vectors do not contain antibiotic resistance genes.
A mutation in the SHH gene may cause which of the following?
A. Anencephaly B. Chiari Formations C. Holoprosencephaly D. Schizencephaly E. Spina Bifida
Which of the following was historically considered to be the biggest limiting factor in worldwide food production up until the last century?
A) carbon B) land C) seed availability D) nitrogen