Myosin is a motor protein involved in animal cell cytokinesis. It binds to ATP or ADP, causing the myosin to move with respect to actin. What is the effect of the interaction between myosin and actin?
A) Vesicles containing plasma membrane constituents are transported to the metaphase plate, where cytokinesis takes place.
B) Excess cytoplasm is removed.
C) The cleavage furrow deepens.
D) Two new daughter nuclei form.
Answer: C
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Which of the following protist lineages is appropriately paired with its supportive and/or protective structure?
A) Diatoms have an intricate, chalky, chambered calcium carbonate shell. B) Parabasalids have an internal support rod, made of cross-linked microtubules, that runs the length of the cell. C) Alveolates have tough plates in the cell wall that are made up of cellulose. D) Euglenoids cover themselves with tiny pebbles. E) Dinoflagellates are surrounded by a glass-like, silicone dioxide cell wall.
What is the main benefit of having hemoglobin in the blood?
A. It increases the amount of oxygen that can be carried in the blood. B. It keeps oxygen separated from carbon dioxide within the blood. C. It increases the solubility of carbon dioxide in the blood plasma. D. It is an important source of iron for body cells. E. All of the answer options are correct.
There is an autosomal gene that controls baldness, and
its expression is sex-influenced, so that the gene for baldness (B) is dominant in males but recessive in females. In females the allele B1 for nonbaldness is dominant over the gene for baldness. If a heterozygous nonbald woman marries a nonbald man, what will be the appearance of their children? Work out the possibilities for each sex. What will be an ideal response?
"All living organisms are composed of cells" is an example of what type of scientific statement?
A. a theory B. a hypothesis C. a fact D. a prediction E. a discovery