Which of the following statements about molecular switches is false?
(a) Phosphatases remove the phosphate from GTP on GTP-binding proteins, turning them off.
(b) Protein kinases transfer the terminal phosphate from ATP onto a protein.
(c) Serine/threonine kinases are the most common types of protein kinase.
(d) A GTP-binding protein exchanges its bound GDP for GTP to become activated.
Choice (a) is false. GTP-binding proteins themselves hydrolyze their bound GTP to GDP, using their own intrinsic GTPase activity.
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How small is the smallest object that can be seen with a light microscope?
a. 2 µm b. 0.2 µm c. 2 nm d. 0.2 nm
What evidence would support the hypothesis that larger cells evolved in part by engulfing other, smaller cells?
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When a disease is said to have a multifactorial basis, it means that
A) many factors, both genetic and environmental, contribute to the disease. B) it is caused by a gene with a large number of alleles. C) it affects a large number of people. D) it has many different symptoms. E) it tends to skip a generation.