下列关于DNA的叙述正确的是( )-最需题库

试卷相关题目

1下列生物中，除细胞膜外几乎不含磷脂分子的有（）①乳酸菌 ②变形虫 ③肺炎双球菌 ④酵母菌
A.①②
B.②③
C.③④
D.①③
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2氨基酸之间的脱水缩合和脱氧核苷酸之间的聚合作用分别发生在（）
A.叶绿体、核糖体
B.细胞核、线粒体
C.细胞核、核糖体
D.核糖体、细胞核
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3根据中心法则和右表所列已知碱基，推测表中的正确密码子为（）<table style="MARGIN: auto 6.75pt; BORDER-COLLAPSE: collapse; mso-table-layout-alt: fixed; mso-table-overlap: never; mso-table-lspace: 9.0pt; mso-table-rspace: 9.0pt; mso-table-anchor-vertical: paragraph; mso-table-anchor-horizontal: margin; mso-table-left: center; mso-table-top: 8.0pt; mso-padding-alt: 0cm 0cm 0cm 0cm" border="0" cellspacing="0" cellpadding="0" align="left" _dj="MsoNormalTable"><tbody><tr style="PAGE-BREAK-INSIDE: avoid; HEIGHT: 10.35pt; mso-yfti-irow: 0; mso-yfti-firstrow: yes"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1.5pt solid; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0cm; WIDTH: 114.45pt; PADDING-RIGHT: 0cm; HEIGHT: 10.35pt; BORDER-TOP: windowtext 1.5pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm" rowspan="2" width="153">双链DNA</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0cm; WIDTH: 42.55pt; PADDING-RIGHT: 0cm; HEIGHT: 10.35pt; BORDER-TOP: windowtext 1.5pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt" width="57">T</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0cm; WIDTH: 34.75pt; PADDING-RIGHT: 0cm; HEIGHT: 10.35pt; BORDER-TOP: windowtext 1.5pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt" width="46">C</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0cm; WIDTH: 34.75pt; PADDING-RIGHT: 0cm; HEIGHT: 10.35pt; BORDER-TOP: windowtext 1.5pt solid; BORDER-RIGHT: windowtext 1.5pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt" width="46"> </td></tr><tr style="PAGE-BREAK-INSIDE: avoid; HEIGHT: 4.15pt; mso-yfti-irow: 1"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0cm; WIDTH: 42.55pt; PADDING-RIGHT: 0cm; HEIGHT: 4.15pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" width="57"> </td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0cm; WIDTH: 34.75pt; PADDING-RIGHT: 0cm; HEIGHT: 4.15pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" width="46"> </td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0cm; WIDTH: 34.75pt; PADDING-RIGHT: 0cm; HEIGHT: 4.15pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1.5pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" width="46">T</td></tr><tr style="HEIGHT: 11.3pt; mso-yfti-irow: 2"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1.5pt solid; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0cm; WIDTH: 114.45pt; PADDING-RIGHT: 0cm; HEIGHT: 11.3pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="153"> 反密码子</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0cm; WIDTH: 42.55pt; PADDING-RIGHT: 0cm; HEIGHT: 11.3pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" width="57"> </td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0cm; WIDTH: 34.75pt; PADDING-RIGHT: 0cm; HEIGHT: 11.3pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" width="46"> </td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0cm; WIDTH: 34.75pt; PADDING-RIGHT: 0cm; HEIGHT: 11.3pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1.5pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" width="46">U</td></tr><tr style="HEIGHT: 10.85pt; mso-yfti-irow: 3; mso-yfti-lastrow: yes"><td style="BORDER-BOTTOM: windowtext 1.5pt solid; BORDER-LEFT: windowtext 1.5pt solid; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0cm; WIDTH: 114.45pt; PADDING-RIGHT: 0cm; HEIGHT: 10.85pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-top-alt: solid windowtext 1.0pt" valign="top" width="153"> 密码子</td><td style="BORDER-BOTTOM: windowtext 1.5pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0cm; WIDTH: 42.55pt; PADDING-RIGHT: 0cm; HEIGHT: 10.85pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" width="57"> </td><td style="BORDER-BOTTOM: windowtext 1.5pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0cm; WIDTH: 34.75pt; PADDING-RIGHT: 0cm; HEIGHT: 10.85pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" width="46"> </td><td style="BORDER-BOTTOM: windowtext 1.5pt solid; BORDER-LEFT: #000000; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0cm; WIDTH: 34.75pt; PADDING-RIGHT: 0cm; HEIGHT: 10.85pt; BORDER-TOP: #000000; BORDER-RIGHT: windowtext 1.5pt solid; PADDING-TOP: 0cm; mso-border-left-alt: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext 1.0pt" width="46"> </td></tr></tbody></table>
A.UCA
B.AGU
C.AGU
D.AGA
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4落地生根这种植物生长到一定时候，在叶片边缘会长出许多芽体，这些芽体脱落后又会发育成新个体，这种生殖方式是（）
A.孢子生殖
B.出芽生殖
C.营养生殖
D.分裂生殖
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5患感冒时，鼻黏膜充血肿胀，堵塞鼻腔，这时吃东西觉得没味。这是因为（）
A.味薷失去味觉功能
B.嗅细胞接触不到食物的气味刺激
C.嗅细胞失去嗅觉功能
D.大脑皮层味觉中枢失去感觉功能
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6达尔文进化理论不能解释的问题是（）
A.生物多样性
B.生物的生存斗争
C.生物遗传变异的本质
D.变异的不定向性和选择的定向性
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7在西葫芦的皮色遗传中，已知黄皮基因Y 对绿皮基因y为显性，但在有白色基因F时，则Y和y都不能表达（两基因独立遗传），现有FfYy个体自交，其后代的表现型的种类和比例是（）
A.4种， 9:3:3:1
B.2种，13：3
C.3种，12：3：1
D.3种，10：3：3
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