A homozygous recessive condition is
A. aa.
B. Aa.
C. AA.
D. AaBb.
A. aa.
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Which of the following statements about open and closed circulatory systems is false?
A. Closed circulatory systems use muscular hearts to pump blood through blood vessels, whereas open circulatory systems lack any kind of muscular pump. B. Closed circulatory systems operate under higher pressure than open circulatory systems. C. Closed circulatory systems can more effectively control the flow of blood to specific body regions than open circulatory systems. D. Closed circulatory systems deliver materials at faster rates than open circulatory systems. E. Closed circulatory systems have higher resistance to flow than open circulatory systems.
The process of making new DNA molecules is semi-conservative. This means that every new DNA molecule is composed of
A.) two completely identical strands of DNA. B.) one original and one new strand of DNA. C.) one strand of DNA and one strand of RNA D.) two strands that mix original and new DNA.
A codon reads AUA. The anticodon that recognizes it is TAT. If false, make it a correct statement.
a. true b. false
What would be an easy way to determine if a skull is a mammal's skull?
A. Examine the teeth. B. Look for the remains of the tympanum. C. Look for air sacs in the skull. D. Measure the brain case volume.