The most frequent kind of mutation, point mutations, occur when (select all that apply)
A. a single base pair is replaced by another
B. DNA repair mechanisms fail during
replication.
C. open reading frames are altered.
D. a block of nucleotides are rearranged.
E. none of these
D
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Why do skates and rays have flattened bodies, while sharks are torpedo shaped?
A) Sharks have a strong cartilaginous skeleton that helps them maintain a tubular shape, while skates and rays lack such a skeleton. B) Sharks are more closely related to the tubelike lampreys than skates and rays are. C) Skates and rays need enlarged pectoral fins to help them stay level in turbulent water, while sharks do not. D) Skates and rays exchange gases across their skin and thus require a high surface-area-to-volume ratio, while sharks use gills to respire. E) Sharks are streamlined for active swimming off the bottom, while skates move about mostly on the ocean bed.
One type of weak chemical interaction occurs when two molecules having partial electrical charges of opposite polarity form an intermolecular attraction. These interactions are called:
A. ionic bonds. B. hydrogen bonds. C. hydrophobic interactions. D. van der Waals interactions. E. covalent bonds.
The isolation and copying of a gene, usually in large quantities is called gene cloning
Indicate whether the statement is true or false
Which of the following types of transport occur across the erythrocyte membrane?
A) O2 and CO2 passive diffusion B) aquaporin water transport C) Cl? bicarbonate ion antiport D) glucose uniport E) All of the above are correct.