14. One of the most critical pieces of evidence to the discovery of DNA structure was
A. its composition of four different nucleotides.
B. its mode of replication.
C. an X-ray diffraction pattern suggesting a double helix shape.
D. the backbone containing sugar-phosphate linkages.
E. the covalent bonding between different nucleotides.
C. an X-ray diffraction pattern suggesting a double helix shape.
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What is meant by the "multiple hit" model of cancer?
A) Most cancer-causing mutations are passed on to future generations. B) Most cancers occur in many different tissues simultaneously. C) Multiple mutations are required to cause most forms of cancer. D) A person gets cancer only if both of his or her parents had cancer.
The part of an atom without a charge is a(n)
A. ion. B. neutron. C. electron. D. molecule.
Which stage is the only diploid stage in the zygote fungus life cycle?
A. Gametangia B. Mycelium C. Immature zygospore D. Spores E. Zygote
Changes in ________ represent the predominant cause for biological evolution.
A. growth and development B. genetic makeup C. energy D. reproduction E. homeostasis