What structure may have acted as a boundary for a cell-like environment before protocells formed?

a. acidic water from volcanic springs
b. chambers in rocks
c. metal ions from rocks
d. clay
e. lipid membrane


b

Biology & Microbiology

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Glucose is stored in plants as _________ and in animals as _________

A. glycogen; starch B. cellulose; glycogen C. starch; cellulose D. starch; glycogen E. cellulose; starch

Biology & Microbiology

Collecting ducts in the kidney lead

immediately into the a. renal cortex. b. renal medulla. c. renal pelvis. d. ureter. e. urethra

Biology & Microbiology

Which of the following crosses represents a dihybrid cross?

A. RD × Rd B. RrDd × RrDd C. RR × Dd D. RRrr × DdDd E. Rd × RR

Biology & Microbiology

Because of the high requirement for reducing power in nitrogen fixation, the nitrogenase enzyme that carries out the reaction is very sensitive to the presence of ________.

A. oxygen B. light C. carbon dioxide D. None of the choices are correct.

Biology & Microbiology