Why does water have a high heat capacity?
a. because it has covalent bonds
b. because it has ionic bonds
c. because it has hydrogen bonds
d. because it has a high boiling point
e. because it has a low freezing point
C
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The pores through which leaves exchange atmospheric gases with leaf cells during photosynthesis are the
A. sieve tube elements. B. guard cells. C. stomata. D. epidermal cells. E. petioles.
Only mammals produce hormones
Indicate whether the statement is true or false
The significance of the Hershey and Chase
experiments in which 32P and 35S were used is that a. DNA labeled with 35S and proteins labeled with 32P can be traced in the course of an experiment. b. they demonstrated that DNA labeled with 32P is transferred from the bacteriophage to the virus. c. they established that proteins labeled with 35S become deactivated and unable to be transferred. d. they demonstrated that bacteriophages transfer their DNA, not their protein coats, into their hosts. e. DNA may be the hereditary material; although, bacteriophages transfer both DNA and proteins into their hosts.
Asian pearl divers hyperventilate in order to reduce the ____ concentration in the blood
a. oxygen b. hydrogen ion c. carbon dioxide d. chloride ion e. hemoglobin