How many copies of each plant chromosome are found in the triploid cells that make up endosperm of a typical plant?
A) 1
B) 2
C) 3
D) 4
C
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With minor exceptions, the genetic code ____
a. is the same for all living organisms and viruses b. is specialized so that viruses use a different code than all living organisms c. differs between different organisms and viruses d. is the same for all viruses and for single-celled organisms, but is more complex in multicellular organisms e. has three versions: one for viruses, one for single-celled organisms, and one for multicellular organisms
Systolic blood pressure is the
A. pressure in veins. B. pressure in major arteries caused by the contraction of the left ventricle. C. pressure in major arteries when the heart is relaxing. D. difference in pressure that causes the pulse.
A good hypothesis must:
A) be theoretical. B) be true. C) be false. D) be falsifiable. E) lead to a question.
Endotherms:
A. All of the answer options are correct. B. generate heat from the breakdown of food and other metabolic reactions. C. usually maintain a constant body temperature that is higher than that of their environment. D. include mammals and birds. E. have high metabolic rates.