What is an allele?

A. A group of proteins

B. A type of virus

C. A group of chromosomes

D. A form of a gene

What is the difference between stenosis and regurgitation?

Which of the following energy sources are most available at the edges of tectonic plates? A. natural gas B. tides C. wind D. geothermal

You have learned in biology class that a substance called chlorophyll makes leaves green. you guess that perhaps leaves change color because they do not produces chlorophyll when temp gets colder. what have u done

Which of the following is a reason why cells divide? A. to keep demands on their DNA low. B. to mutate their DNA. C. to increase the volume of their cytoplasm. D. to become larger in size.

Which species is least likely to survive according to charles darwin?

Which of the following does not contain carbon and energy iron ice cream lettuce or eggs

In what ways has poland suffered because of its lack of natural barriers

Which of the following statements is/are true? a. Loose connective tissue includes cartilage. b. Closely packed bundles of collagen fibers are characteristic of loose connective tissues. c.

Identify twice substances that can cause changes in DNA

In which of the following cells can more than one nucleus be found? A. An unfertilized egg B. Neuron C. Sertoli cell D. Muscle fibre