When an organism has two different alleles at a gene locus, it is referred to as _____.
a. homozygous recessive
b. homozygous dominant
c. heterozygous
Ans: c. heterozygous
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Which of the following will increase the speed of an action potential moving down an axon?
I) Action potentials move faster in larger diameter axons. II) Action potentials move faster in axons lacking potassium ion channels. III) Action potentials move faster in myelinated axons. A) only I and II B) only II and III C) only I and III D) I, II, and III
In the late 1960's, Robert Paine conducted landmark studies on diversity in the rocky intertidal zone comparing the species diversity in control plots with diversity in experimental plots from which he removed the top predator, sea stars
After 5 years, 15 species of intertidal invertebrates lived in the control plots, while the experimental plots were dominated by only two species, one mussel and one barnacle. Why did species diversity most likely remain high in the presence of a predator? A. The sea star kept the mussel and barnacle populations low enough to prevent competitive exclusion from occurring. B. The sea star kept the mussel and barnacles from developing a mutualistic relationship. That, in turn, kept their populations low. C. The mussel and the barnacle parasitized the sea star, keeping populations low enough to prevent competitive exclusion from occurring. D. The sea star developed a mutalistic relationship with the mussel and barnacle, keeping their populations low and preventing competitive exclusion from happening.
Answer the following statements true (T) or false (F)
1.Administering antivenom is a form of active immunity. 2.A vaccine could be prepared against a virus by allowing a patient to breathe viral coat proteins. This primary response would allow for a later, strong secondary immune response to the virus. 3.A baby receiving antibodies in breast milk from its mother is an example of passive immunity. 4.Innate immune responses involve antibodies. 5.A person is having an immune response to their flu vaccine by producing antibodies and memory cells. This is an example of passive immunity.
Please choose from the lists below the proper order of three words that best characterize the three mechanisms of succession proposed by Connell and Slatyer: facilitation, inhibition, and tolerance. The words should relate properly to the effect of one species on the probability of a second species becoming established during succession.
A) neutral, positive, negative B) positive, neutral, negative C) positive, negative, neutral D) negative, positive, neutral