What base is found in DNA but not in RNA?

A. thymine

B. adenine

C. guanine

D. deoxyribose

During the 1950s, a scientist named Lysenko tried to solve the food shortages in the Soviet Union by breeding wheat that could grow in Siberia.

How can the knowledge of the human genome be useful for in-vitro fertilization techniques? A) Genes with the desired traits can be introduced into the sperm of infertile males. B) The genes that cause infertility can be removed from the female ovum.

Is an enzyme a molecule that is increased the rate of a chemical reaction. an enzyme is a kind of

A cloning vector was digested with only one restriction enzyme. Immediately after a single ORF flanked with overhanging ends, generated with the same enzyme, was cloned into the plasmid. The ORF was inserted downstream a single inducible promoter.

A condition marked by blood glucose levels that are below normal levels is hypoglycemia. type 1 diabetes. type 2 diabetes. ketoacidosis.

Under the microscope, a cell shows formation of centrosomes and spindle microtubules. What will happen next?

What is a measurement of the earth's history divided into time periods A) fossil record B) sedimentary rocks C) geologic time scale D) radioactive elements

The initial organisms on earth were essentially prokaryotic heterotrophs. how did they obtain their energy?

Lynx feed on rabbits, and the growth curves for these two species fluctuate together. This relationship is an example of a (n) Select one: a. S-shaped growth curve. b. J-shaped growth curve. c. irregular fluctuations. tightly linked cycle.

Where did the marine life most affected by the extinction live? 1. The Arctic Circle 2. Rivers And Streams 3. Warm Tropical Waters 4. None Of The Above