Which of the following best describes a model organism?
A) It is often pictured in textbooks and easy for students to imagine.
B) It is well studied, it is easy to grow, and results are widely applicable.
C) It is small, inexpensive to raise, and lives a long time.
D) It has been chosen for study by early biologists.
B
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Which of the following statements best describes the structure of a hemoglobin molecule?
A. Hemoglobin is comprised of three globin molecules and one heme group per hemoglobin molecule. B. Hemoglobin is comprised of four globin molecules, each with their own heme group that binds to and carries oxygen. C. Hemoglobin is comprised of four globin molecules, each of which contain millions of heme groups. D. Hemoglobin is comprised of two globin molecules, both with their own heme group that binds to and carries oxygen.
Escherichia coli and Salmonella can live in our intestines in the presence or absence of oxygen. The are considered
A. obligate anaerobes. B. phototrophs. C. facultative anaerobes. D. autotrophs. E. aerobic.
Animals that are being hunted (often illegally) for body parts thought to have medicinal value include:a
rhinos and bears. b. cheetahs and snow leopards. c. snow leopards and bears. d. wolves and mountain lions. e. mountain lions and black-footed ferrets.
The major pathway for molecules to pass into and out of the nucleus is through
a. gap junctions between the nuclear envelope membranes. b. porin channels in the nuclear envelope membranes. c. nuclear pore complexes. d. diffusion through the membrane bilayers of the nuclear envelope.