Transgenic plants are generally different from traditional hybrid plants produced hundreds of years ago, because transgenic plants may
A) contain genes from animals or bacteria.
B) contain synthetic DNA or genes.
C) have new traits not found in their ancestral species.
D) not be used as sources of human food.
A
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A pharmaceutical company wishes to study a possible new headache medicine. They are doing human trials with 1000 volunteers who experience frequent headaches. The researchers will need to ________
A) put all women in the control group and all men in the experimental group B) have 10 volunteers in the control group C) control for the type of headache–stress, migraine, or other causes D) give all 1000 volunteers the same amount of the new medication E) divide the groups by level of health
________ is defined as the number of protons plus the number of neutrons in an atom
A) Nuclear number B) Mass number C) Atomic number D) Ionic number
The Earth can be considered as interrelated systems or spheres.
Answer the following statement true (T) or false (F)
If a small piece of iron that has a temperature of 25°C is placed in a container of 1,000 g of water that has a temperature of 99°C, which of the following is likely to occur?
a. The iron will melt if the piece is small enough b. The temperature of the water will increase to 100 C and start to boil c. Some heat will be transferred from the water to the iron d. The temperature of the iron will decrease