Genes known as ________ encode proteins that stimulate cell division.
Fill in the blank(s) with the appropriate word(s).
proto-oncogenes
Genes known as proto-oncogenes encode proteins that stimulate cell division.
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Why is calcium necessary for muscle contraction?
A. Calcium is needed to activate troponin so that tropomyosin can be moved to expose the myosin-binding sites on the actin filament. B. Calcium is needed to allow the muscle fiber to become depolarized. C. Calcium functions as a neurotransmitter and is released from the motor neuron. D. Calcium is needed to cock the myosin head so that it can form a cross-bridge with actin. E. Calcium is needed to detach the myosin from the actin.
In this experiment, you are working with available planter pots from the laboratory. You have choices of clay pots of different sizes, as well as biodegradable peat pots and others within lab equipment provided. To establish a standardized variable, you would
A. report the pot type used, though recognizing the pot is not as important as fertilizer and light to the strawberries. B. select a variety of sizes based on the initial strawberry plant size. C. choose clay pots for the fertilized plants, and biodegradable pots for the unfertilized plants. D. monitor the strawberry growth rates and determine a mathematical correction to account for the type and size of pot used. E. select all sixteen pots to be of the same material and size for the experiment.
The first eukaryotic fossils are dated to about
a. 3.8 billion years ago. b. 2.1 billion years ago. c. 1.5 billion years ago. d. 750 million years ago. e. 201 million years ago.
The surface area of a cell is important because
A. the surface area limits the amount of molecular exchange that can take place between the cell and its surroundings. B. a small surface area allows the cell to protect itself from foreign organisms. C. a large surface area makes the cell more fragile. D. the surface area determines the genetic capabilities of the cell.