Abby is trying to focus on her A&P exam, but she feels something crawling along the back of her arm. Alarmed, she jumps up and brushes away a small spider. Which of the following does Abby have to thank for alerting her to this issue?

A) Spinothalamic tract
B) Fasciculus gracilis tract
C) Spinocerebellar pathway
D) Tectospinal tract

Which body structure describes the freshwater hydra?

A) a swimming medusa with mouth pointing downward
B) a swimming medusa with mouth pointing upward
C) a sessile medusa with mouth pointing upward
D) a polyp with mouth pointing downward
E) a polyp with mouth pointing upward

Maltose is classified as a

A) nucleic acid.
B) fatty acid.
C) protein.
D) carbohydrate.
E) lipid.

Which of the following cell types is an immature red blood cell?

A) Erythrocyte
B) Reticulocyte
C) Thrombocyte
D) Monocyte
E) Leukocyte

Which of the following helps to explain why antibiotic resistance can evolve especially quickly?

A) Bacteria reproduce quickly.
B) Bacteria can acquire genes from other bacteria.
C) Antibiotics provide strong selection pressure.
D) all of the above

In an operon, the switch that controls mRNA synthesis is the promotor, which is a sequence of bases upstream from the first structural gene.