Different versions or forms of the same gene are called ...

a) chromosomes

b) nitrogen bases

c) sex cells

d) alleles

How many types of essential amino acids do humans require from their diets?

place the following levels or organization in the correct order from smallest to largest: organelles, atom, tissue, organism, organ system, organ, molecule, and cell.

Which of the following statements are true of muscle diseases? Select all that apply. Polio is caused by an infection. Cancer in muscle is quite rare. Polio is caused by lack of vitamins, Muscle diseases are always congenital.

Which two gases makes up 99% of cour atmosphere?

In which kingdoms are both unicellular and multicellular organisms found?

An infant moves involuntarily when you touch the soles of his feet. such a movement is

Antoine lavoisier explained the role of a gas in the rusting of iron and in respiration. which gas was this

What does DNA contain A. the chromosomes that build proteins B. the coded blueprint C. the ability to translate RNA code D. the factors for heredity called alleles

Most organisms can be divided into two categories - prokaryotes and eukaryotes. What is the main difference between these two categories?

Triggers that may lead to an episode of drug abuse/use can be