Which of the following events occurs during the G₂ phase of the cell cycle?

A) Completion of cell growth and production of enzymes
B) DNA replication
C) Synthesis of substances and materials that will be needed in the S phase
D) Separation of sister chromatids, and migration toward opposite sides of the dividing cell
E) Dispersal of the nucleolus and nuclear envelope

autoimmune disorder where the body attacks the synovial joints

A) osteoporosis
B) bone remodeling
C) sprain
D) rheumatoid arthritis
E) arthritis

Which of the following statements concerning thoracic volume is true?

A) As thoracic volume increases, alveolar pressure (P_alv) increases.
B) In expiration, the thoracic volume increases.
C) Constriction of bronchioles assists breathing.
D) As alveolar volume increases, alveolar pressure (P_alv) decreases.
E) Pressure is directly proportional to volume.

A heterozygous fruit fly with normal wings and a gray body ( VvBb ) is crossed with homozygous flies with vestigial wings and black bodies ( vvbb ) . Out of 800 total F₁ progeny, 296 are normal gray, 328 are vestigial black, 99 are normal black, and 77 are vestigial gray. What is the best explanation for this result?

A) The loci for wing length and body color are on different chromosomes.
B) The loci for wing length and body color are on sex chromosomes.
C) The loci for wing length and body color are on the same chromosome.
D) Mendel's principle of independent assortment accounts for this.
E) Mendel's principle of segregation accounts for this.

The flattened snout of the pig is called the ________.

A) choanae
B) epiglottis
C) rostrum
D) glottis

When anyone severs his spinal cord, they suffer a loss of sensation and a loss of voluntary control.

Explain why atoms such as helium (atomic number 2), neon (atomic number 10), and argon (atomic number 18) do not react with other atoms.

The appearance of a cleavage furrow indicates that

A) mitosis is about to begin.
B) cytokinesis is occurring.
C) the cell will soon be entering the S phase.
D) the G₂ phase is coming to an end.
E) the G₀ phase is occurring.