Which biogeochemical cycle is directly associated with fossil fuels?

A) carbon
B) nitrogen
C) hydrological
D) phosphorus
E) All of the answer choices are correct.

Karyotyping can be used to diagnose which of the following genetic disorders?

A) Down syndrome
B) phenylketonuria
C) neurofibromatosis
D) cystic fibrosis
E) hemophilia

Buffers

A) are strong acids or bases.
B) keep the pH within normal limits.
C) release large amounts of hydrogen ions (H⁺) .
D) will only lower the pH.
E) will only increase the pH.

A ________ plane (section) divides the body into anterior and posterior portions.

A) sagittal
B) transverse
C) horizontal
D) coronal
E) paramedian

The pH of blood is slightly alkaline. Which of the following would therefore be an expected pH for blood?

A) 6.4
B) 4.6
C) 4.7
D) 7.4
E) 13.8

The biconcave structure of an erythrocyte is shaped to better accommodate the crystalline structure of hemoglobin.

Magnesium

A) Functions in carbon dioxide metabolism and transport, also needed for protein metabolism
B) Component of hemoglobin
C) A constituent of coenzymes; needed for bone formation and proper function of nerve and muscle
D) Needed for the production of thyroxine
E) Component of nucleic acids and ATP; used in bone formation

In Singapore, the terms of individual bargaining agreements:

A) Are determined by government intervention
B) Must meet government approval
C) Are enforced by economic power
D) Are limited to nonwage issues only