28.Which of the following is a type of tumor? (A) retinoblastoma. (B) Huntington's disease. (C) phenylketonuria. (D) cystic fibrosis. 35.Checkpoints during the cell cycle are important because they (A) allow the organelle activity to catch up to cellular demands. (B) ensure the integrity of the cell's DNA. (C) allow the cell to generate sufficient ATP for cellular division. (D) are the only time DNA replication can occur. 36.When a cell secretes a signaling molecule that binds to receptors on neighboring cells as well as the same cell, this is called ______ signaling. (A) paracrine (B) autocrine (C) synaptic (D) endocrine 40.Sites in the genome of a species which are commonly used for DNA fingerprinting are most accurately referred to as (A)contigs. (B) restriction sites. (C)short tandem repeats. (D) microarrays. 42.Which of the following statements is NOT true? (A)Ribozymes can link amino acids to form protein. (B)Ribozymes are proteins. (C)Ribozymes can act as enzymes. (D)Ribozymes can act as informational molecules. 43.DNA synthesis is (A) initiated by an RNA primer at the 5'end of the existing strand (B) initiated only once at the replication fork during the synthesis of both strands (C) continuous in the 5'to 3' direction in the lagging strand and discontinuous in the leading strand (D) conducted in the 5' to 3' direction in both lagging and leading strands ※ 引述《cynthiachen (cyn)》之铭言： : 你好!小妹对了一下答案 : 发现有几题跟你的不一样欸 : 分别是 6.(C) 9.(A) 10.(C) 14.(D) 24.(D) : 28.(A) 35.(B) 36.(B) 40.(C) 42.(B) 43.(D) : 感谢你的热心po文:D --

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