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Biology

If the mean IQ is 100 with a standard deviation of 15, what is the approximate probability that a randomly selected sample of nine people will have a mean IQ greater than 110?

Which of the following statements is false? a. When the hydrogen ion concentration decreases, the hydroxyl ion concentration also decreases. b. Acids and bases react with each other to form water and a salt when mixed. c. Blood has a slightly basic pH. d. The higher the concentration of hydrogen ions in a solution, the more acidic the solution becomes.

This microbe is photosynthetic, but in the absence of light it can use organic compounds as an energy source. Its carbon source is an organic compound. The appropriate classification for this organism would be ______.

Which of the following is not depicted in alcohol advertisements? a. Drinkers as athletic b. Negative side effects on drinkers c. Drinkers as healthy d. Drinkers as successful

The restriction enzymes of bacteria protect the bacteria from successful attack by bacteriophages, whose genomes can be degraded by the restriction enzymes. The bacterial genomes are not vulnerable to these restriction enzymes because bacterial DNA is methylated. This situation selects for bacteriophages whose genomes are also methylated. As new strains of resistant bacteriophages become more prevalent, this in turn selects for bacteria whose genomes are not methylated and whose restriction enzymes instead degrade methylated DNA. The outcome of the conflict between bacteria and bacteriophages at any point in time results from ________.

Plate A has oceanic lithosphere on its leading edge that is 10 million years old. Plate B has oceanic lithosphere on its leading edge that is 200 million years old. Which plate will be subducted if they collide with each other, and why?

what is nitrification?

In nucleotide excision repair, damaged dna is excised by what enzyme(s)? in nucleotide excision repair, damaged dna is excised by what enzyme(s)? ligase nuclease dna polymerases primase helicase

Which is generally easier to accomplish: proving or disproving a hypothesis?

If an organism has alleles Bb, it is: a. recessive b. heterozygous c. homozygous d. none of the above

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