How many molecules of oxygen can bind with one molecule of human hemoglobin?
A) One B) Two C) Three D) Four E) Five
D
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During apoptosis
a. digestive enzymes are unleashed. b. proteases break down structural proteins. c. nucleases break down nucleic acids. d. the nucleus breaks apart. e. all of these occur.
Which of the following cells contain a plasma membrane?
A) Animal cells only B) Animal cells and plant cells only C) Animal cells, plant cells, and bacterial cells D) Bacterial cells only
Which of the following statements regarding the concept of homology is INCORRECT?
a) Homology is an all-or-none relationship. b) Homology is the presence of a similar feature because of convergence. c) Homology can not be observed because we can not actually see the ancestral organism or molecules and trace its descent. d) Sequences that are highly similar are unlikely to arise by chance. e) Homology is always an inference, a conclusion we draw based on observed similarity.
The role of water in photosynthesis is to
A) maintain turgor pressure. B) provide H2. C) provide oxygen. D) provide electrons.