Which of the following is a unique, derived trait that is present in all birds?

a. ability to fly
b. four-chambered heart
c. feathers
d. lack of a urinary bladder
e. migration


C

Biology & Microbiology

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What are the characteristics of hemoglobin? Check all that apply.

_____ It is a large protein. _____ It has four subunits. _____ It binds four O2 molecules cooperatively. _____ O2 is bound to the heme group that contains an iron atom. _____ It has an O2 binding group that includes a copper atom.

Biology & Microbiology

How is brain growth in humans different from other mammals?  

A.  In humans brain growth is complete by the third trimester. B.  In humans brain growth stops at birth. C.  Human growth is not allometric. D.  In humans brain growth continues after birth. E.  Only humans develop a cerebrum.

Biology & Microbiology

In the plant life cycle, what process takes place

between the formation of gametes and the formation of the zygote?

a. mitosis b. meiosis c. fertilization d. more than one of these e. none of these

Biology & Microbiology

Which of the following white blood cells alerts the immune system when an antigen is present?

a. neutrophils b. basophils c. eosinophils d. dendritic cells e. B and T lymphocytes

Biology & Microbiology