Erwin chargaff studied the dna of organismswithin a single species. chargaff discovered thatthe amount of adenine is about equal to the amountof thymine. which of these explains why the ratioof adenine to thymine is nearly 1:1

Which of the following best explains the environmental problems associated with trawling? a. Trawling always destroys sea floor ecologies. b. Trawling gathers fish indiscriminately. c. Trawling is too selective at gathering fish. d. All of the above

What reproductive structure do aminotes have over pre-aminotes?

Each female body contains a female brain. Handy. Makes things work. Stick pins in it and you get amazing results. Old popular songs. Short circuits. Bad dreams. Anyway: each of these brains has two halves.

Describe the structure of haemoglobin and explain how its 3 dimensional structure is achieved to enable it to carry oxygen molecules.

Observations that we make about how organisms are evolving during our lifetimes can be used to explain how organisms evolved thousands of years ago. True or false?

Describe two factors that cause variations in climate?

A demonstration is performed during a lecture on muscle physiology in which a student is asked to fully extend his right arm with the palm up. Two large textbooks are placed on his palm, one at a time.

How is it that the heartworm is able to multiply in numbers at such a fast rate?

Ground squirrels are found in many areas of the United States. They live in underground burrows and are often attacked by birds of prey, coyotes, and boBCats. Which of the following is a limiting factor for a ground squirrel population?

10. Which of the following is an emerging dis- ease that was unknown 50 years ago? a. malaria b. dengue fever C. Lyme disease d. schistosomiasis