Sickle cell disease is caused by a:

A. change in one allele.

B. change in the size of a chromosome.

C. change in two proteins.

D. change in the number of chromosomes in a cell.

Which of the following can tell can you that a tiger and a lion are different species? They have different colors. They can mate. Their offspring are infertile. They are both carnivores.

Which of the following best describes cell membrane

Which of these groups of animals are extinct? 1] polarbears 2] killer whales 3] dinosaurs 4] sea turtles

What is the part of an experiment that can be changed called?

Which life processes do cell organelles perform

What is the correct treatment for second-degree or third-degree burns with open blisters?

Why are male birds more colorful than female birds?

The period between cell division is called A.) Interphase B.) Prophase C.) G3 phase D.) Cytokineses

At its carrier sites a hemoglobin molecule can combine with? A: oxygen, carbon dioxide and carbon monoxide B: oxygen, carbon dioxide and nitrogen C: oxygen and carbon dioxide D: oxygen and carbon monoxide

What are the 3 acceptable methods for cooling food?