Mutation of a mouse gene results in mice that lack heart muscle. What characteristic would you expect to find in a human gene that has a common origin with this mouse gene?
A) The DNA sequence of the human gene will be identical to the DNA sequence of the mouse gene.
B) The human and mouse genes will specify proteins with similar amino acid sequences.
C) The human and mouse genes will specify unrelated sequences of amino acids, but both proteins will function to prevent the formation of heart muscle.
D) The human and mouse genes will specify unrelated sequences of amino acids, and the human gene will not be involved in heart muscle formation.
B) The human and mouse genes will specify proteins with similar amino acid sequences.
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Select all of the following that are true about cephalopods.
_____ They may be very large and can weigh over 1000 pounds. _____ They are very intelligent and are capable of learning by observation. _____ They lack a shell. _____ They are exclusively herbivorous. _____ They have a closed circulatory system
When threshold potential is reached, which of the following occurs?
a. The activation gates of Na+ channels open. b. The inactivation gates of Na+ channels open. c. The activation gates of K+ channels open. d. The inactivation gates of Na+ channels open. e. Na+/K+ active transport pumps are activated.
Food energy is measured in ____
a. kilograms b. kiloliters c. kilometers d. kilocalories e. kilojoules
Floods and earthquakes that affect population size are ____
a. carrying capacities b. replacement factors c. density-dependent controls d. density-limiting controls e. density-independent controls