Why do the deciduous leaves on temperate forest trees turn from green to orange, red, and/or yellow before falling?

A) The chlorophyll changes color as it's broken down.
B) The chlorophyll is absorbed by the tree, leaving the other pigments visible.
C) New photosynthetic pigments are created as the amount of daylight becomes limited.
D) New pigments are created in response to colder temperatures.


B

Biology & Microbiology

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The coronary arteries supply blood to the heart muscles. Which of the following events would occur in heart tissue following a heart attack due to a block in the coronary arteries? Circle all correct answers

What will be an ideal response?

Biology & Microbiology

Recombination between homologous chromosomes:

A. can lead to a gene conversion event if the region between the two Holliday intermediates contains base pair differences. B. uses extended synthesis-dependent strand annealing (ESDSA) rather than synthesis-dependent strand annealing (SDSA). C. can occur at completely random sites on the chromosome; there is no apparent regulation of the process. D. occurs between sister chromatids and nonsister chromatids with equal frequency. E. None of the choices given is true.

Biology & Microbiology

Which of the following is not a polysaccharide?

A) extensin B) glycogen C) cellulose D) starch E) chitin

Biology & Microbiology

The typical osmolarity of body fluids in most freshwater invertebrates is

a. ~5 mOsm/L. b. ~225 mOsm/L. c. ~300 mOsm/L. d. ~1000 mOsm/L. e. ~1500 mOsm/L.

Biology & Microbiology