Answer the following questions true (T) or false (F)
1. Observation of a natural event by more than one human or scientific instrument is the basis of the scientific method.
2. The experiments of Louis Pasteur to disprove spontaneous generation illustrate the process of the scientific method.
3. A theory must be supported by evidence.
1. FALSE
2. TRUE
3. TRUE
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Which of the following acts as a carrier of foreign DNA and is needed to clone a gene?
A. plasmid B. viral vector C. fungal vector D. plasmid and viral vector E. viral vector and fungal vector
Lysogeny always requires integration of the viral genome into the host chromosome.
Answer the following statement true (T) or false (F)
What is the function of the nucleus in the cell?
a. It is the repository for most of the genetic material (chromatin) in the cell. b. It controls all cellular activity. c. It is responsible for packaging DNA fragments. d. Both a and b above.
This table shows the abundance of iridium in and near the K–T boundary layer. Depths are given as meters above or below the boundary layer. The iridium content of an average Earth rock is 0.4 parts per billion (ppb) of iridium. An average meteorite contains about 550 parts per billion of iridium. Which conclusion do these data best support?
1.the earth was struck by a large asteroid 65.5 million years ago
2.an asteriod collision caused a mass extinction that wiped out the dinosaurs
3.the K-T boundary indicates the beginning of an ice age
4.rates of evolution increased dramatically after the K-T boundary