The nervous system

A) monitors internal and external stimuli.
B) transmits information in the form of action potentials.
C) interprets or assesses information.
D) maintains homeostasis.
E) All of the choices are correct.

Diatoms have elaborate shells made of

A) carbon.
B) magnesium.
C) plastic.
D) silica.
E) cellulose.

Which type of cell would have an abundance of peroxisomes?

A) White blood cell, a phagocyte
B) Mucus cell (secretes mucus)
C) Liver cells that detoxify hydrogen peroxide
D) Cardiac muscle cells (require large amounts of ATP)
E) Fibroblast (makes protein fibers)

Which statement is accurate about how C₄ plants are able to survive hot, dry spells during the growing season?

A) When the stomata close during heat stress, RuBP carboxylase is not exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to avoid photorespiration.
B) When the stomata close during heat stress, RuBP carboxylase is exposed to the increase in carbon dioxide concentration experienced in the leaf. This allows the plant to avoid photorespiration.
C) When the stomata open during heat stress, RuBP carboxylase is not exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to avoid photorespiration.
D) When the stomata close during heat stress, RuBP carboxylase is exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to undergo photorespiration.
E) When the stomata open during heat stress, RuBP carboxylase is not exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to undergo photorespiration.

An animal found in the rocky intertidal zone has eight overlapping plates and is tightly adhering to the rock with a muscular foot. This animal is most likely a member of the class:

A) Polyplacophora
B) Cephalopoda
C) Polychaeta
D) Gastropoda
E) Bivalvia

Which of the following statements regarding leukocytes is TRUE?

A) Leukocytes have no nucleus.
B) Leukocytes play a role in oxygen transport.
C) Leukocytes are the largest of the formed elements.
D) Leukocytes are only fragments of cells.
E) There is only one kind of leukocyte.

Some closely related species do not interbreed simply because the timing of their reproduction differs. What type of reproductive isolation is this?

A) mechanical
B) ecological
C) temporal
D) behavioral
E) gamete incompatibility

The motor neurons responsible for making a fist are ________.

A) tripolar
B) bipolar
C) multipolar
D) pseudo-unipolar
E) None of the choices are correct.