更多"Instead, it is occurring in biology"的相关试题:
[简答题]Instead, it is occurring in biology laboratories, for it involves the deliberate manipulation in test tubes of the genes of crop plants. (Passage Four)
[填空题]Researchers in the Human Engineering Laboratories discovered the evidence that big vocabulary means big financial success
[单项选择]Naturally occurring chemicals cannot be newly patented once their structures have been published. Before a naturally occurring chemical compound can be used as a drug, however, it must be put through the same rigorous testing program as any synthetic compound, culminating in a published report detailing the chemical"s structure and observed effects.
If the statements above are true, which of the following must also be true on the basis of them
A. Any naturally occurring chemical can be reproduced synthetically once its structure is known
B. Synthetically produced chemical compounds cannot be patented unless their chemical structures are made public
C. If proven no less effective, naturally occurring chemicals are to be preferred to synthetic compounds for use in drugs
D. Once a naturally occurring compound has been approved for use as a drug, it can no longer be newly patented
E. A naturally occurring chemical cannot be patented unless its effectiveness as a drug has been rigorously established
[单项选择]
Arsenic, a naturally occurring poison and carcinogen found in ground water, is strongly linked to adult-onset diabetes, U. S. researchers said on Tuesday. Odorless, tasteless, colorless and easily soluble in water or wine, arsenic has long been a feared poison. A heavy dose is detectable in a corpse, but researchers say small amounts of arsenic may sicken people gradually.
Dr. Ana Navas-Aeien and colleagues at Johns Hopkins University in Baltimore found a " relatively strong " association between commonly found levels of arsenic in urine and type 2 diabetes in a study of American adults. " It seems there is maybe no safe level of arsenic. " Navas-Acien said in a telephone interview. " Worldwide it’s a huge problem, " she said. " As water becomes a scarce resource. the situation becomes even more serious. "
Arsenic raises the risk for cancers of the bladder, lung, kidney, skin and, possibly, the pros tate, Navas-Acien s
A. smell
B. taste
C. poison
D. color
[填空题]
| What do the occurring gasses above us act as |
[判断题]
A later winter storm is occurring in the Northwest in Mid-Atlantic.
[填空题]Abdominal pain occurring before meal indicates ______.
