C. genetic factors. D. the E. xample of the F. riends. 相关知识点: 试题来源: 解析 C 正确答案:C解析:细节题。短文开头说到没人知道为什么人分左撇子和右撇子,说是由父母的教育方式造成的是不对的。换句话来说,人一生下来就已经决定是左撇子还是右撇子了,即决定人是左撇子还是右撇子的是自身的...
72.A 本题考查前后句子的联系,根据前文Since scientists have noticed that left-handedness tends to run in families,it's assumed that left-handedness has a genetic(基因的) component to it.可知左撇子的形成有基因的原因,也就是说左撇子是天生如此,故选A. 73.C 本题考查前后句子的联系,根据前文Histori...
When this genotype is absent, right or left dominance for speech and motor control is equally likely. When genetic theories cannot be used to describe a phenomenon, psychologists typically look for environmental explanations such as pressures imposed on young children to use one hand or the other....
3. DNA is right handed. The ladder-like structure of DNA usually twists to the right. This twist makes DNA’s shape asymmetrical. If you try to superimpose the mirror image of DNA onto itself, it will not fit. Just like your right and left hand. ...
However, what is true for a right-handed person needs to be reversed for someone who is left-handed. The heart line is the one at the top of the palm. It starts from the little finger and extends towards the mounts of Jupiter and Saturn. The heart line represents the person's love...
The world is designed for right-handed people, but why does a tenth of the population prefer the left? 1. The answer to it remains a bit of a mystery. Since scientists have noticed that left-handedness tends to run in families, it’s assumed that left-handedness has a genetic(基因...
For example, most right-handed tennis players have little experience of playing left-handers, but left-handers have plenty of experience of playing right-handers. Whatever the advantages are, handedness seems to be genetic. With 10 percent of people preferring their left hand, there must be ...
Pizzarello found that in experiments where sugar synthesis was performed in the laboratory under conditions thought to have pertained on the early Earth, a constant rain of chemicals of the right (or in this case, liter- ally, left) 'handedness' caused the 'native' sugars to change their ...
re walkingdownthe staircase. If you’re turning to the right as you descend, the DNA structure is right-handed; if turning to the left, it’s left-handed. In the image shown earlier, the DNA molecule on the right is a right-handed double helix, while its mirror image is left-handed...
The world is designed for right-handed people but why does a tenth of the population prefer the left? 36 The answer to it remains a bit of a mystery. Since scientists have noticed that left-handedness tends to run in families it’s assumed that left-handedness has a genetic(基因的) ...