Suppose a scientist working on a new drug for cancer developed a chemical that irreversibly breaks the hydrogen bonds in the DNA molecules within cancerous cells but leaves all of the covalent bonds intact
Hydrogen bonds are relatively weak compared to covalent bonds, and they are routinely broken and reformed as the DNA molecule is replicated in a normal cell. Their stability is nonetheless critical for maintaining certain aspects of the structure and function of the DNA molecule.
Based on this scenario and your knowledge of DNA, how would this newly discovered chemical affect the "molecule of heredity" in a human cancer cell?
A) It would break the individual strands of the DNA molecule apart, preventing it from functioning normally.
B) It would result in constant DNA replication within the cell.
C) It would break the two strands of the DNA molecule apart, preventing it from functioning normally.
D) It would allow the DNA molecule to function normally except during replication.
C
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In the amniote egg diagram shown, the item labeled "4" is the
a. yolk sac. b. chorion. c. allantois. d. amnion. e. albumin.
How are the five nucleotides similar to each other?
a. All five are composed of a phosphate group, sugar, and a nitrogenous base. b. All five contain the same nitrogenous base. c. All five have the same number of atoms.
How many chromosomes would a typical human cell have after mitosis but before cytokinesis?
A) 0 B) 23 C) 46 D) 92
Which hominin may be a direct ancestor of our genus but had long arms, short legs, and grasping feet?
A) Homo erectus B) Kenyanthropus platyops C) Australopithecus afarensis D) Homo neanderthalensis