How many amino acids are common to all living systems?
A) 10
B) 20
C) 30
D) 100
B
You might also like to view...
Denitrifying bacteria are often facultative anaerobes, capable of performing other forms of respiration or fermentation as well as nitrate reduction
Indicate whether the statement is true or false.
Which of Lamarck's ideas was the least influential to Darwin’s evolutionary theory?
a. Species change through time. b. New characteristics are passed from one generation to the next. c. Organisms change in response to their environment. d. Acquired characteristics are passed on from parents to offspring. e. Specific mechanisms exist that foster evolutionary change.
Which of the following eukaryotic organelles
are believed to have existed as independent prokaryotes in the past?
a. peroxisomes b. chloroplasts c. mitochondria d. lysosomes e. more than one of these
Viruses are characterized by all of the following except
A. being specific to the hosts they infect. B. being acellular. C. being capable of independent reproduction. D. being found in every organism investigated so far.