Which statement best describes a DNA mutation?
a. DNA polymerase adds an incorrect base during replication.
b. DNA is damaged by UV irradiation.
c. A mistake in DNA sequence is repaired during replication.
d. A permanent change occurs in the nucleotide sequence of DNA.
e. Proofreading during replication replaces a mismatched nucleotide.
d
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Use the following figure and information to answer the question(s) below
Fishes that have swim bladders can regulate their density and, thus, their buoyancy. There are two types of swim bladder: physostomous and physoclistous. The ancestral version is the physostomous version, in which the swim bladder is connected to the esophagus via a short tube (see the figure above). The fish fills this version by swimming to the surface, taking gulps of air, and directing them into the swim bladder. Air is removed from this version by "belching." The physoclistous version is more derived, and has lost its connection to the esophagus. Instead, gas enters and leaves the swim bladder via special circulatory mechanisms within the wall of the swim bladder. When a shark stops swimming, it _____. 1. sinks 2. quickly dies 3. oxygenates its blood less effectively A) 1 only B) 2 only C) 3 only D) 1 and 3 E) 1, 2, and 3
Dissolved oxygen is highest in which body of water?
a. warm eutrophic lake b. slow-moving tropical river c. pool within a cool forest stream d. white water stretch of a cold river e. dissolved oxygen should be the same in all waters
A (colony/plaque/prophage) is a clear zone on a bacterial lawn where cells have been killed by the activity of a bacteriophage
What will be an ideal response?
The function of epithelial tissue is to:
A) allow for movement of the body. B) form the immune system. C) protect and cover the body. D) support the body.