Stromatolites are rocklike columns composed of:

a. protists
b. dinoflagellates
c. microbial biofilms
d. heterotrophic organisms
e. photosynthetic eukaryotes


c

Biology & Microbiology

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The Krebs cycle takes place in the ____

a. ribosomes b. cytoplasm c. nucleus d. mitochondria e. chloroplasts

Biology & Microbiology

Anury is the absence or abbreviation of the tail in animals, including sheep. It is inherited in an autosomal dominant fashion. A ram with anury is mated to a ewe with a normal tail. The ram's father had anury, his mother did not. What is the probability that the ram and ewe will produce a lamb with anury? (ram = male; ewe = female)

A. No chance B. 75% C. 25% D. 100% E. 50%

Biology & Microbiology

Please match the cell types with the statements that most accurately describe them to test your understanding of prokaryotic cells, eukaryotic cells, and viruses.

Contains nucleic acid A) Prokaryotic cells B) Eukaryotic cells C) Viruses D) Both eukaryotic and prokaryotic cells E) Prokaryotic cells, eukaryotic cells and viruses

Biology & Microbiology

On what basis was life divided into three domains?

A. cytochrome c sequence data B. the presence or absence of a nucleus and organelles C. presence or absence of mammary glands D. rRNA sequence data E. mitochondrial DNA sequence data

Biology & Microbiology