Which scientist's work first suggested that DNA had the shape of a helix?
A. Martha Chase
B. James Watson
C. Rosalind Franklin
D. Francis Crick
Answer: C
You might also like to view...
Viral capsids are generally constructed without any outside aid once the subunits have been synthesized. This process is called
A. spontaneous maturation. B. facilitated assembly. C. self-maturation. D. self-assembly.
Nicotine from cigarette smoke acts as a ligand and associates with specific cells in the nervous system. Nicotine eventually produces feelings of pleasure and well-being. Below are the events that happen in the cellular response to nicotine
Place the events in the correct order to describe the five basic steps in the pathway of a signal transduction system (receptor binding, receptor activation, signal transduction and amplification, response, and termination). A) The acetylcholine receptor is an ion channel, and, when a ligand binds, the ion channel opens. B) An influx of ions causes an action potential, which carries the signal to the reward areas of the brain. C) Nicotine binds to the transmembrane protein that normally binds the neurotransmitter acetylcholine. D) The signal causes release of dopamine in the brain, which causes good feelings. E) Nicotine is quickly eliminated from the body (causing cravings for more cigarettes to produce good feelings). A. C, A, B, D, E B. A, D, B, C, E C. B, A, C, D, E D. C, D, B, A, E
In order for a species to be successfully reintroduced into an area,
a. hunting must be restricted. b. populations of the animals cannot be too small. c. suitable habitat must be maintained. d. all of these
____ are involved in transfer of genetic
information from one bacterial cell to another.
a. Flagella b. Cilia c. Pili d. Ribosomes e. Plasmids