One way bacteria are important to the Earth and its ecosystems is that

a. bacteria concentrate valuable minerals.

b. bacteria decompose dead organisms.

c. bacteria produce acetone.

d. bacteria use oxygen.

Which of the following mutations is likely to have the greatest effect on the resulting polypeptide? A. deletion of a single nucleotide B. base substitution mutation C. silent mutation D. neutral mutation

17 A student in science class is using a light microscope to determine if a cell is prokaryotic or eukaryotic. Identification of which of the following cell parts would allow the student to definitively conclude that the cell is eukaryotic?

Excessive secretion of gastric juice or mucus in the stomach is called

Scientists have discovered a galaxy at a distance of 600 billion kilometers from Earth. What is the distance, in AU, between the galaxy and Earth? 400 AU 600 AU 4000 AU 6000 AU

Secretion of human chorionic gonadotropin (hcg) occurs during what time frame during pregnancy?

Which of these is a fiber - yielding crop?

A cluster sample is obtained by selecting individuals who are easily contacted or those who voluntarily respond.

Were does condensation occur? A) Hydroshere B) Lithoshere C) Boishere D) Atmosphere

A three-year-old-has stuck a crayon in his nose. Assessment reveals the crayon to be deeply embedded in the right nostril with some irritation and swelling noted. His vital signs are: pulse 124, respiration 20, and SpO 2 100 percent.

Polymers are made of individual subunits called