When did the first eukaryotic cell form?
A) 2.1 thousand years ago
B) 2.1 million years ago
C) 2.1 billion years ago
D) 3.7 billion years ago
C
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Match the kind of plastid with its function.
A) chromosome movement B) flower color C) plastid precursor D) nucleic acid production E) lipid storage F) starch storage G) protein production H) chloride storage I) photosynthesis J) protein storage 1) proplastid 2) amyloplast 3) chloroplast 4) chromoplast 5) elaioplast
The interaction between panic grass and its endophyte fungus that allows them to grow at 65°C together, but not independently, is an example of
A. commensalism. B. predation. C. parasitism. D. competition. E. mutualism.
What is a good estimate of the current rate of species extinction?
A) one species per day B) one species per year C) one species per millennium D) one species per million years
Straps of dense connective tissue that join bones to bones at joints are called ________.
a) ligaments b) marrow c) tendons d) vertebra