The earliest photosynthetic organisms

A) date back to the time when life first emerged on Earth.
B) possessed chloroplasts.
C) probably did not produce oxygen.
D) probably used water as a source of hydrogen.
E) probably used hydrogen sulfide as a source of hydrogen.


E

Biology & Microbiology

You might also like to view...

Genetic recombination can occur ____

a. during DNA replication b. during asexual reproduction c. during mitosis d. from an Hfr X F- conjugation e. from an F+ X F- conjugation

Biology & Microbiology

Which is not true about the Human Microbiome Project?

A. The HMP can only identify bacteria, not viruses. B. The HMP is looking for pathogens as well as nonpathogens in and on the human body. C. Molecular biological lab techniques will be used for identification rather than standard biochemical lab techniques. D. The importance of the project is in analyzing the normal biota and correlating with human health and disease.

Biology & Microbiology

Muscle contraction accounts for over 75% of the heat generated by the body

Indicate whether the statement is true or false

Biology & Microbiology

The nephron begins in the ____.

A. glomerulus B. loop of Henle C. kidney cortex D. ureter E. medulla

Biology & Microbiology