The pictures show two different ferns that lived millions of years apart. The early fern is extinct, but is drawn based on fossil evidence. Scientific data reveals that the early
fern is an ancestor of the modern fern.
Early Fern
Modern Fern
Which statement best explains why the fern changed over time?
O Humans cut ferns to be decorations, causing each generation to be smaller in size.
O As the Sun aged, its energy output decreased and limited the size ferns could grow.
O As flowering plants emerged, less energy was left for ferns and the growth of ferns was stunted.
The changing environment caused unfit plants to die and better adapted plants were smaller in size.

Are gametes exactly the same? explain why or why not?

Which areas of earth receive the most precipitation on average? a. tropics b. temperate zones c. regions near 30? n and s latitudes d. polar zones 1

Penicillin is hydrolyzed and thereby rendered inactive by penicillinase (also known as β-lactamase), an enzyme present in some resistant bacteria. the mass of this enzyme in staphylococcus aureus is 29.6 kd. the amount of penicillin hydrolyzed in 1 minute in a 10-ml solution containing 10-9 g of purified penicillinase was measured as a function of the concentration of penicillin. assume that the concentration of penicillin does not change appreciably during the assay. penicillin(μm) amount hydrolyzed(nmol) 1 0.11 3 0.25 5 0.34 10 0.45 30 0.58 50 0.61 (a) plot v0 versus [s] and 1/v0 versus 1/[s] for these data. does penicillinase appear to obey michaelis-menten kinetics? if so, what is the value of km? (b) what is the value of vmax? (c) what is the turnover number of penicillinase under these experimental conditions? assume one active site per enzyme molecule.