Which free-living cells were the earliest contributors to the formation of Earth's oxidizing atmosphere?

a) chloroplasts
b) mitochondria
c) endosymbionts
d) seaweeds
e) cyanobacteria


Answer: e) cyanobacteria

Biology & Microbiology

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Air flow in a microbiology laboratory should be:

a. from lower to higher risk areas. b. minimized as much as possible. c. optimized to prevent the settling of dan-gerous aerosols. d. well-filtered by recirculating it through numerous filters before recycling.

Biology & Microbiology

In RNA, uracil is present instead of the thymine in DNA

Indicate whether the statement is true or false

Biology & Microbiology

Which of the following terms accurately describes the replication of DNA in vivo?

A) dispersive B) conservative C) semidiscontinuous D) continuous E) nonlinear

Biology & Microbiology

Which of the following statements about hair cells is not true?

A. Their structure includes stereocilia and a kinocilium. B. Bending of the cells triggers ion flow across the cell membrane. C. They are found in the mammalian ear. D. They are found in the fish lateral line system. E. They can be repaired if they rupture.

Biology & Microbiology