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单选题 nullA point at which the two strands of a DNA double helix are unwound and separated during replication. ( )
学科：默认课程
时间：2025-11-14 04:02:36
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题目1单选题
A purine base that is an essential constituent of the nucleic acids and also of such coenzymes as NAD and FAD.( )A. adenineB. cytosineC. guanineD. thymine
题目2单选题
nullA single-ring nitrogenous base molecule in DNA and RNA. It is complementary to guanine. ( )A. adenineB. cytosineC. guanineD. pyrimidine
题目3单选题
An enzyme that brings new DNA triphosphate nucleotides into position for bonding on another DNA molecule. ( )A. purineB. guanineC. DNA polymeraseD. nucleoside
题目4单选题
The three-dimensional structure of doublestranded DNA. ( )A. pyrimidineB. purineC. DNA double helix 双螺旋D. nucleoside
题目5单选题
nullA double-ring nitrogenous base molecule in DNA and RNA. It is the complementary base of cytosine. ( )A. purineB. guanineC. pyrimidineD. nucleoside
题目6单选题
nullA purine or pyrimidine base attached to ribose or deoxyribose. The nucleosides commonly found in DNA and RNA are: cytidine, cytosine deoxyriboside, thymidine, uridine, adenosine, adenine deoxyriboside, guanosine, and guanine deoxyriboside. Note that thymidine is a deoxyriboside and cytidine, uridine, adenosine,and guanosine are ribosides. ( )A. nucleosideB. pyrimidineC. purineD. thymine
题目7单选题
One of a group of nitrogenous bases whose parent compound has the formula shown. The two most abundant purines are adenine and guanine, which are constituents of nucleic acids and coenzymes. ( )A. purineB. thymineC. guanineD. pyrimidine
题目8单选题
A heterocyclic organic compound, C4N4N2 the fundamental form of pyrimidine bases. Some of these bases are constituents of nucleic acid. ( )A. purineB. pyrimidineC. guanineD. thymine
题目9单选题
nullA point at which the two strands of a DNA double helix are unwound and separated during replication. ( )A. purineB. ThymineC. replication forkD. Guanine
题目10单选题
nullA single-ring nitrogenous base molecule of DNA but not RNA. It is complementary to adenine. ( )A. adenineB. thymineC. guanineD. cytosine
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