By some estimates, how many species are undergoing premature extinction because of human actions?

a. 6 per day


b. 10 per day
c. 1 per hour
d. 6 per hour
e. 10 per hour


ANSWER: d

Biology & Microbiology

You might also like to view...

The tertiary structure of a protein is the _____

A) bonding together of several polypeptide chains by weak bonds B) order in which amino acids are joined in a polypeptide chain C) unique three-dimensional shape of the fully folded polypeptide D) organization of a polypeptide chain into an ?-helix or ?-pleated sheet E) overall protein structure resulting from the aggregation of two or more polypeptide subunits

Biology & Microbiology

Tuberculoid Hansen's disease is caused by the pathogen

A) Listeria monocytogenes. B) Mycobacterium leprae. C) Mycobacterium tuberculosis. D) either Mycobacterium leprae or Mycobacterium tuberculosis.

Biology & Microbiology

The "pin" structure of a helicase:

A. serves as a spool for the DNA. B. holds the helicase dimers in the correct position. C. allows rewinding of the DNA after transcription. D. separates the complementary strands of DNA. E. prevents a translocation mechanism.

Biology & Microbiology

Rhythms that are repeated every 24 hours are

a. sleep movements. b. tropisms. c. physiological requirements. d. circadian rhythms. e. biological clocks.

Biology & Microbiology