Red blood cells contain 2% salt. What will happen when the cell is placed in a 10% salt solution?
a. The cell will burst.
b. The cell will shrink.
c. The cell will remain unchanged, but salt will diffuse out of the cell.
d. The cell will remain unchanged, but salt will diffuse into the cell.
e. The cell will remain unchanged, but water will diffuse out of the cell.
ANSWER: b
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Neurons that carry messages within the CNS are
(a) sensory. (b) motor. (c) interneurons. (d) autonomic.
Answer the following statements true (T) or false (F)
1. The modification of a limb that was used for walking in a pre-existing ancestor to one that is used as a wing for a species today is called proteomics. 2. A bacterial infection such as pneumonia is most likely caused by organisms derived from the animal kingdom. 3. All genetic mutations are harmful to an organism. 4. Vertical evolution, whereby living organisms evolve from a common ancestor ("tree of life"), is the only mechanism of evolution on Earth.
Which of the following organelle is seen inside the nucleus of a cell?
a. mitochondria b. centriol c. nucleolus d. ribosomes
In mice, there is a set of multiple alleles of a gene for coat color. Four of those alleles are as follows:
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