Which of the following characteristics is NOT a distinguishing feature of all primates?

Select one:
a. opposable thumb
b. fingernails
c. usually single birth
d. extended period of parental care
e. expanded hindbrain


e. expanded hindbrain

Biology & Microbiology

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When performing 2-D gel electrophoresis, what is the purpose of exposing the proteins to sodium dodecyl sulfate (SDS)?

A. SDS masks all of the proteins' native charge with a positive charge. B. SDS masks all of the proteins' native charge with a negative charge. C. SDS makes all of the proteins' the same molecular weight. D. SDS adds a hydroxyl group to amino acid residues on each of the proteins. E. SDS masks all of the proteins' native charge with a neutral charge.

Biology & Microbiology

The narrow region near the equator where trade winds meet is referred to as the ________

Fill in the blank(s) with correct word

Biology & Microbiology

What is the impulse that travels down a neuron's axon?

A) shock signal B) action potential C) currenter D) resistor

Biology & Microbiology

Hardy-Weinberg pointed out that the original proportions of the genotypes in a population would remain constant from generation to generation if certain assumptions are met. Which one of the following is not a Hardy-Weinberg condition?

A. The population is very large. B. No polymorphic loci exist in the population. C. Random mating occurs. D. No gene flow occurs. E. No selection occurs.

Biology & Microbiology