The nutrients utilized by the Archaea were most likely 

A. sugars and proteins.
B. CO2, CO, H2, H2S, N2, and S.
C. vitamins and minerals.
D. carbohydrates and fats.


B. CO2, CO, H2, H2S, N2, and S.

Biology & Microbiology

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Which of the following is a disadvantage of an

exoskeleton?

a. It does not provide as efficient a muscle anchorage as an endoskeleton. b. It allows for excess water loss. c. It must be shed for its owner to grow. d. It is not flexible enough to allow a full range of movements. e. It is not able to absorb pigments for sufficient camouflage

Biology & Microbiology

A tendon is an extension of ____ tissue

a. dense connective b. loose connective c. bony d. epithelial e. muscle

Biology & Microbiology

A positive allosteric effector will ________ the activity of an enzyme while a negative effector will ________ the activity.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

The cell theory is a fundamental organizing principle of biology that states all of the following, except _____

the cell is the smallest unit of life cells make up all living things new cells can arise only from preexisting cells living things are made of at least two cells

Biology & Microbiology