Which of the following is NOT part of the respiratory membrane?

A) Simple squamous epithelium of the alveolus and its basement membrane
B) Interstitial space
C) Pulmonary capillary simple squamous epithelium and its basement membrane
D) Thick layer of mucus lining the alveolus

Which T cell boosts the immune response by activating other types of cells?

A) helper T cell
B) suppressor T cell
C) cytotoxic T cell
D) memory T cell
E) IgT cell

The climax community in a biome that receives a large amount of rainfall would include

A) plants with high tolerance to full sun, limited water, and limited nutrients.
B) the pioneer community.
C) small native plants of the area such as grasses and herbs.
D) large plants such as shrubs and trees.
E) lichens, mosses, and ferns.

In the Beadle and Tatum study, it was important that Neurospora was haploid because:

A) it is easier to grow haploid molds in the laboratory.
B) haploid molds have simpler nutritional requirements than do diploid molds.
C) a mutation that arises is not masked by a normal allele on a homologous chromosome.
D) haploid Neurospora will always mutate.
E) diploid Neurospora will always mutate.

What is the main reason that duck-billed platypuses are classified as mammals rather than birds? Consider that they possess a bill, as do birds, and lay eggs rather than give birth to live young like other mammals.

What is wood?

A) primary xylem
B) secondary xylem
C) secondary phloem
D) cork and cork cambium
E) periderm