问题 单项选择题

以下属于基因工程产品的是()。

A.基因药物

B.克隆羊

C.无籽西瓜

D.玉米

答案

参考答案:A

解析:

基因工程又称基因拼接技术和DNA重组技术,是以分子遗传学为理论基础,以分子生物学和微生物学的现代方法为手段,将不同来源的基因(DNA分子),按预先设计的蓝图,在体外构建杂种DNA分子,然后导入活细胞,以改变生物原有的遗传特性,获得新品种、生产新产品。基因工程技术为基因的结构和功能的研究提供了有力的手段。

选择题
单项选择题

(A)

Next time a customer comes to your office, offer him a cup of coffee. And when you’re doing your holiday shopping online, make sure you’re holding a large glass of iced tea. The physical sensation of warmth encourages emotional warmth, while a cold drink in hand prevents you from making unwise decisions-those are the practical lesson being drawn from recent research by psychologist John A. Bargh.

Psychologists have known that one person’ s perception of another’ s "warmth" is a powerful determiner in social relationships. Judging someone to be either "warm" or "cold" is a primary consideration, even trumping evidence that a "cold" person may be more capable. Much of this is rooted in very early childhood experiences, Bargh argues, when babies’ conceptual sense of the world around them is shaped by physical sensations, particularly warmth and coldness. Classic studies by Harry Harlow, published in 1958, showed monkeys preferred to stay close to a cloth "mother" rather than one made of wire, even when the wire "mother" carried a food bottle. Harlow’ s work and later studies have led psychologists to stress the need for warm physical contact from caregivers to help young children grow into healthy adults with normal social skills.

Feelings of "warmth" and "coldness" in social judgments appear to be universal. Although no worldwide study has been done, Bargh says that describing people as "warm" or "cold" is common to many cultures, and studies have found those perceptions influence judgment in dozens of countries.

To test the relationship between physical and psychological warmth, Bargh conducted an experiment which involved 41 college students. A research assistant who was unaware of the study’s hypotheses, handed the students either a hot cup of coffee, or a cold drink, to hold while the researcher filled out a short information form: The drink was then handed back. After that, the students were asked to rate the personality of "Person A" based on a particular description. Those who had briefly held the warm drink regarded Person A as warmer than those who had held the iced drink.

"We are grounded in our physical experiences even when we think abstractly." says Bargh.

The author mentions Harlow’s experiment to show that().

A. adults should develop social skills

B. babies need warm physical contact

C. caregivers should be healthy adults

D. monkeys have social relationships