The heart of amphibians has ____ chambers. The hearts of birds and mammals have ____ chambers

a. two; three
b. three; four
c. two; four
d. three; five
e. three; two


b

Biology & Microbiology

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The tertiary structure of a protein is ____

a. the amino acid sequence in a polypeptide chain b. generated by the formation of bonds between amino acids c. formed by a protein region folding on itself d. formed by the interaction of two or more polypeptide chain e. generated by bonding and folding of ribosomes attached to the endoplasmic reticulum

Biology & Microbiology

Hypothermia results from

a. a drop in core temperature for a prolonged period of time. b. a lack of homeostasis. c. an imbalance between energy inputs (nutrients) and energy output. d. prolonged exposure to heat. e. dehydration.

Biology & Microbiology

How do ray-finned fish keep from sinking?

a. they are constantly swimming b. they don’t constantly swim but their fins are constantly moving c. they have lungs that are always filled with air d. they have a swim bladder that is filled with gas e. they have a skeleton that is less dense than the surrounding water

Biology & Microbiology

Describe the shared derived characteristics that support grouping the hemichordates, chordates, and echinoderms

together as deuterostomes. What will be an ideal response?

Biology & Microbiology