Which of the following investigators was (were) responsible for the discovery that in DNA from any species, the amount of adenine equals the amount of thymine, and the amount of guanine equals the amount of cytosine?
a) Erwin Chargaff
b) Alfred Hershey and Martha Chase
c) Matthew Meselson and Franklin Stahl
d) Oswald Avery, Maclyn McCarty, and Colin MacLeod
Ans: a) Erwin Chargaff
You might also like to view...
Describe how testicular function is controlled by the hypothalamus and anterior pituitary. What will be an ideal response?
Interneurons are responsible for the distribution of sensory information and the coordination of motor activity. They are also involved with all higher functions, such as memory, planning, and learning. The more complex the response to a given stimulus, the greater the number of interneurons involved. Knowing this, what can you predict about the ratio of interneurons to sensory and motor neurons in the nervous system of higher animals?
A. Since interneurons connect the other two types, it is necessary to have only half as many interneurons as motor and sensory neurons. B. Interneurons likely outnumber all other types of neurons combined. C. There must be equal numbers of sensory neurons, motor neurons and interneurons. D. None of the answers are correct.
When evolution leads to behaviors that are good for a species or population but detrimental to the individual exhibiting the behavior, this process is called:
a. reciprocal altruism. b. kin selection. c. group selection. d. selfish selection. e None of the above.
The mutations that lead to genetic disease cause human illness commonly because:
most genetic diseases make people more likely to become sunburned. the overproduction of extra enzymes makes you sick. a molecule normally metabolized by an enzyme accumulates to toxic levels. mutations in DNA cause body cells to self destruct. mutations cause extra DNA to be made, which gets into your blood, causing illness.