A water solution whose pH is 4

a. is always neutral.

c. is always acidic.

b. is always basic.

d. might be neutral, basic or acidic.

The enzyme β-galactosidase catalyzes what reaction?

An adolescent with pneumonia is admitted to the pediatric unit. after his parents leave the unit for the evening, he tells the nurse he may have contracted human immunodeficiency virus (hiv).

Which micro-organisms are used to make bread soft and fluffy? Briefly describe how this happens.

Do autotrophs need to perform cellular respiration?

Sandy has noticed that her younger brother is beginning to emit much stronger body odor than he used to. his skin is oily and he has some hair underneath his arms now. sandy's brother is specifically experiencing increased levels of

Give two abiotic factors which will affect the growth on a school playing field

What are the big four macromolecules common to living organisms, what are the subunits of each?

Match each process to the sphere at most directly involves

What are the four basic needs all living things must satisfy

What property makes water molecules stick together?