Leaf __________ in the fall is an adaptation for flowering plants to survive harsh winters in temperate

climates.
a. desiccation
b. photosynthesis
c. abscission
d. growth
e. production


C

Biology & Microbiology

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Certain ________ have RNA for their genetic material

A) bacteria B) viruses C) plants D) eukaryotes E) prokaryotes

Biology & Microbiology

A karyotype reveals:

a) the shape of the spindle. b) 23 pairs of chromosomes. c) the number, shapes, and sizes of chromosomes in an individual cell. d) the sex chromosomes but not the non-sex chromosomes. e) the non-sex chromosomes but not the sex chromosomes.

Biology & Microbiology

Which two enzymes catalyze the steps converting the toxic superoxide ion to less harmful oxygen gas?

A. superoxide dismutase and catalase B. catalase and hydrogen peroxidases C. superoxide dismutase and hydrogen peroxidase D. superoxide dismutase and oxidase E. catalase and oxidase

Biology & Microbiology

Which of the following conditions is likely to decrease the likelihood of skeletal muscle contraction?

(a) partial depolarization of the T-tubule membrane, such that the resting potential is closer to zero (b) addition of a drug that blocks Ca2+ binding to troponin (c) an increase in the amount of ATP in the cell (d) a mutation in tropomyosin that decreases its affinity for the actin filament

Biology & Microbiology