Lyell’s theory of uniformity proposed that ____
a. Earth was shaped by gradual, repetitive change
b. catastrophic geological events caused extinctions
c. geologic events that occurred to shape Earth no longer occur
d. all populations produce more offspring than their environment can support
e. natural selection drives evolutionary change
ANSWER: a
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A. a dynamic cytoskeleton B. membrane systems C. gene regulation D. the ability to perform photosynthesis
To create a mouse model of the human disease Hemophilia A, in which a nonfunctional factor VIII protein results in a blood clotting deficiency, _____
a. a cloned mutant FVIII gene is inserted into fertilized mouse eggs, which are then transferred to a foster mother for gestation and birth b. a cloned normal FVIII gene is inserted into fertilized mouse eggs, which are then transferred to a foster mother for gestation and birth c. mice with similar, naturally occurring, clotting deficiencies are cloned d. embryonic stem cells are harvested from mouse blastocysts, and grown in the lab to produce blood cells for experimental research e. adult mice are infected with bacteria that contain a copy of a mutant human FVIII gene
Which protein assures that sister chromatids of each chromosome remain firmly joined and can resist the pull of the kinetochore microtubules?
What will be an ideal response?
A filter feeder is an animal that:a
has well-developed teeth for stabbing prey. b. secretes paralyzing venom suspended in saliva. c. has a symbiotic relationship with its host. d. entraps food particles from water. e. feeds on nectar while suspended in air.