The Dunkers are a religious group that moved from Germany to Pennsylvania in the mid-1700s. They do not marry with members outside their own immediate community
Today, the Dunkers are genetically unique and differ in gene frequencies, at many loci, from all other populations including those in their original homeland. Which of the following likely explains the genetic uniqueness of this population? A) population bottleneck and Hardy-Weinberg equilibrium
B) heterozygote advantage and stabilizing selection
C) mutation and natural selection
D) founder effect and genetic drift
D
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Many plants are capable of responding very rapidly to mechanical stimuli. For instance, Venus Flytraps respond more quickly than their insect prey can escape
A very mild touch, or a light breeze can cause the leaves of the Sensitive Plant to close tightly. This rapid transmission of touch is accomplished by A) Rapid changes in phloem pressure B) Efficient, rapid transport of auxin C) Self-propagating changes in membrane potential D) Release of volatile airborne signals E) All of the above are employed by these plants.
The ultimate source of energy for humans comes from what source?
A. The sun B. Plants C. Water D. Air E. Animals
In humans and other mammals, X inactivation takes place:
A. early in development, with each new cell inheriting the same inactivated X chromosome as its parent cell. B. late in development, with each new cell inheriting the same inactivated X chromosome as its parent cell. C. throughout the lifetime of an organismâ€"with each new cell division, both X chromosomes are activated, and one is then inactivated in each new cell. D. early in development, with all maternal X chromosomes being inactivated and cells maintaining active copies of only the paternal X chromosome. E. early in development, with all paternal X chromosomes being inactivated and cells maintaining active copies of only the maternal X chromosome.
Which of the following describes a difference between prokaryotes and archaea?
Prokaryotes have cell walls composed of peptidoglycan, whereas archaea do not. Archaea can live only in water, and prokaryotes can live anywhere. Prokaryotes lack nuclei, whereas archaea do not. Prokaryotes reproduce asexually, whereas archaea reproduce sexually.