The left and right sides of the cerebrum are interconnected by which one of the following?
A) pons
B) medulla oblongata
C) corpus callosum
D) thalamus
E) cerebral cortex
C
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A red blood cell may burst when placed in
which of the following kinds of solutions?
a. hypertonic b. hypotonic c. isotonic d. any of these e. none of these
Which structure gives rise to the axial skeletal muscles?
a. primitive streak b. neural tube c. notochord d. pharyngeal arches e. somites
The eyes of newborns are treated with antibiotics to protect from infection with
a. Streptococcus pyogenes. b. Neisseria gonorrhea. c. Staphylococcus aureus. d. Chlamydia trachomatis. e. b and d
Some applications in biology, such as polymerase chain reaction (PCR), require melting the DNA double helix into single strands of DNA. This can be accomplished by heating the DNA. As DNA is heated, why does the double helix structure denature into single strands of DNA but not into individual nucleotides? In other words, why do the single strands remain intact even though the double helix does not?
A. The double helix structure is important for DNA replication, while the single strands carry the information. B. The single strands are wrapped around histones, which protects them from denaturing. C. The double helix is held together with phosphodiester bonds, while the single strands are linked by hydrogen bonds. D. The double helix is held together with hydrogen bonds, while the single strands are linked by phosphodiester bonds.