Neuroglia are the supporting cells for neurons.

The diagram illustrates sensory receptors in the skin. What structure does "E" represent?
A) Meissner corpuscles
B) Free nerve endings
C) Ruffini end organ
D) Pacinian corpuscle
E) Merkel disks

A deficiency of which of the following intermediate cells would result in a marked increase in the clotting time of blood?

A) Lymphoblast
B) Megakaryoblast
C) Monoblast
D) Myeloblast
E) Proerythroblast

French union federations have a business unionism philosophy that is much like that of the U.S.

Brassinosteroids differ from other plant hormones in that they are

A) peptides.
B) steroids.
C) derivatives of adenine.
D) derivatives of aspirin.
E) derivatives of prostaglandins.

Developing countries are most likely to see labor standards as a way to protect U.S. jobs, rather than a good faith effort to improve the lives of working people worldwide.

The presence of the same homeotic genes in a wide range of organisms indicates that

A) these genes evolved early in the history of life.
B) all organisms are composed of exactly the same proteins.
C) the same homeotic mutations are likely to appear in all organisms.
D) essentially we can complete the genome mapping of all animals in a short time.
E) structures remain fairly constant, but regulation of animal development varies widely across the kingdom.

Methylated DNA sequences typically contain ____ genes.

A) transcriptionally active
B) transcriptionally inactive
C) constitutive
D) housekeeping
E) alternatively spliced