Of these membrane transport processes, which do/does not make use of a vesicle?
A. phagocytosis
B. osmosis
C. pinocytosis
D. neither osmosis nor facilitated diffusion
E. facilitated diffusion
D. neither osmosis nor facilitated diffusio
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The accompanying figure shows the history of large meteorite impacts on both the earth and the moon. What is the graph's major implication for the origin of life on Earth?
A) Huge impacts make it unlikely that life arose and survived on Earth before about 3.8 billion years ago. B) Meteorites could not have brought the organic molecules that were necessary for life appear. C) The moon is considerably older than the Earth. D) Life must have originated on a different body in the solar system and been brought to Earth. E) The Oparin-Haldane model of life's origins applies to the moon as well as to the Earth.
Selectins mediate interactions between which of the following?
A) leukocytes and blood vessel endothelial cells B) muscle cells and ECM C) nerve cells and other nerve cells D) intestinal epithelial cells with neighboring cells E) skin cells in different skin layers
Which of the following best describes the genetic material a person receives from his or her father?
A.) 22 pairs of homologous chromosomes and an X and Y chromosome B.) 22 haploid cells and an X or Y chromosome C.) 23 diploid cells and an X and Y chromosome D.) 22 autosomes and an X or Y chromosome
The sharp, inch-long thorns of the crown-of-thorns sea star are its spines. These spines, unlike those of most other sea stars, contain a potent toxin
If it were discovered that crown-of-thorns sea stars do not make this toxin themselves, then the most likely alternative would be that this toxin is _____. A) derived from the nematocysts of its prey B) absorbed from the surrounding seawater C) an endotoxin of cellulose-digesting bacteria that inhabit the sea star's digestive glands D) injected into individual thorns by mutualistic corals which live on the aboral surfaces of these sea stars