Ephedra, evergreen desert shrubs, are in which of the following plant groups?
a. cycads
b. gnetophytes
c. conifers
d. ginkgos
e. angiosperms
b
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Facilitated diffusion is limited by
A. the substrate concentration. B. the size of the cell. C. carrier proteins in the membrane. D. osmotic pressure. E. the size of the pores in the membrane.
Which hormone establishes and maintains normal metabolism?
a. epinephrine b. aldosterone c. oxytocin d. PTH
e. thyroid hormoneAnimal cells typically achieve cytokinesis by
A. forming a cleavage furrow that pinches the cell into two. B. forming a cell plate across the middle of the cell. C. binary fission. D. chromosome condensation. E. chromosome elongation.
Which of the following is true of chemical bonds?
A) Electrons are always shared. B) Electrons can be shared or completely transferred. C) Chemical bonds cannot occur between two identical atoms. D) Atoms can achieve a higher energy state and less stability by forming bonds.