护理入学考试生物
方法
- 说出这道题的主题:细胞结构、物质运输、细胞分裂、DNA 与蛋白质合成、遗传、生物分子、微生物或实验设计。
- 回忆关键规则:A–T 和 G–C,扩散由高浓度向低浓度,水向溶质更多的一侧移动,有丝分裂保持而减数分裂减半染色体数目。
- 对于杂交,先写出亲本的基因型,列出配子,并填好庞尼特方格再计数。
- 对于实验,标出自变量、因变量和控制变量,并问一问证据是支持还是仅仅提示了结论。
- 把每个选项与所问的问题对照,而不是只看它是不是一句真话。
公式表、每个专题的关键方法步骤和 8 道练习题,完整解答附在最后。
心脏壁的哪一层含有心肌?
腹股沟斜疝从哪个位置进入腹股沟管?
胰高血糖素如何升高血糖?
一名年轻女性的肌无力在反复使用后加重,使用乙酰胆碱酯酶抑制剂后改善。最可能的机制是什么?
Which sequence describes the usual flow of genetic information in a cell?
An old idea says giraffes got long necks because each one stretched to reach leaves and passed the longer neck to its young. Why is this idea rejected?
What is carbon-14 dating used for?
Using PV = nRT with R = 0.082 L·atm/(mol·K), how many moles of gas are in 24.6 L at 1 atm and 300 K?
答案: C · 心肌层
心肌层是厚厚的中间肌层。心内膜衬于心腔内面,心外膜覆盖外表面。
答案: C · 经腹股沟管深环,位于腹壁下血管外侧
斜疝经深环穿出,位于腹壁下血管外侧,并沿腹股沟管走行。直疝则在腹壁下血管内侧从后壁突出。
答案: B · 刺激肝脏的糖原分解和糖异生
由 α 细胞分泌的胰高血糖素作用于肝脏,促进糖原分解,并由非糖物质生成新的葡萄糖。
答案: A · 针对神经肌肉接头处乙酰胆碱受体的抗体
在重症肌无力中,自身抗体减少了有功能的乙酰胆碱受体数量。阻断乙酰胆碱酯酶可以留下更多 ACh 与剩余受体结合。
答案: D · DNA to RNA to protein
Genes in DNA are transcribed into RNA, and mRNA is translated into protein. Retroviruses such as HIV are an exception, as they copy RNA into DNA using reverse transcriptase.
答案: A · Changes acquired in a lifetime are not passed on in the genes
This is Lamarck's idea of inheritance of acquired characteristics. Traits gained by use, such as stretched muscles, do not change the DNA in gametes. Darwin's natural selection explains the change through inherited variation instead.
答案: A · Estimating the age of material that was once alive
Living organisms take in carbon-14 while alive. After death it decays with a half-life of about 5700 years, so the remaining carbon-14 shows roughly how long ago the organism died. It is not useful for very old rocks.
答案: B · 1 mol
n = PV ÷ RT = (1 × 24.6) ÷ (0.082 × 300) = 24.6 ÷ 24.6 = 1 mol.
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