Gram staining divides bacteria into __________
groups based on differences in the composition of
their __________.
a. two; DNA
b. four; capsules
c. two; cell walls
d. four; cell walls
e. two; plasma membranes
Answer: c
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An organic compound that provides instructions for the synthesis or production of polypeptide chains is referred to as which of the following?
A) nucleotide B) lipids C) ATP D) DNA
When cloning a gene, one of the steps is to use restriction enzymes to insert the gene of interest into a vector. If you separated the empty vector (the vector without the gene of interest) and the cloned vector (the vector that has the gene of interest
added) using agarose gel electrophoresis, what do you expect to observe on the agarose gel if both vectors are loaded at the same position at the top of the gel? A) The empty vector would migrate farther down than the cloned vector. B) The cloned vector would migrate farther down than the cloned vector. C) The empty vector would migrate the same distance as the cloned vector.
Which feature is not found in protozoans?
A) usually heterotrophic B) performs photosynthesis C) unicellular D) no cell walls E) may reproduce sexually or asexually
Which of the following choices best describes the relationship that exists between moisture and air temperature?
A. The moisture-holding capacity of air decreases as the higher altitude winds of the polar regions descend onto the continents. B. The moisture-holding capacity of air decreases when it is warm and increases when it is cool. C. The moisture-holding capacity of air remains the same (warm or cool) and is not related to its temperature. D. The moisture-holding capacity of air increases when it is warm and decreases when it is cool.