An experimenter wanted to test the effects of cigarette smoking on rats. She infused the cages of 50 rats with cigarette smoke and the cages of another 50 rats with pure, clean air. The rats that received the clean air were the ____
a. experimental group
b. control group
c. model group
d. predictive group
e. independent group
b
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Why is olfaction an ancient sense?
a. it was the first sense to develop in humans b. it was used solely to find potential mates c. it was used to detect predators d. it was used to find shelter e. it was the first sense to develop in amphibians
Initiation of transcription requires:a
a promoter sequence. b. DNA polymerase. c. an RNA primer. d. a DNA primer. e. Okazaki fragments
Following DNA replication, the attached copies of each chromosome are called ________
Fill in the blank with correct word.
In which organelle are lipids synthesized and modified within the eukaryotic cell?
A) the Golgi apparatus B) the vesicle C) the rough endoplasmic reticulum D) the smooth endoplasmic reticulum E) the lysosome