Which of the statements below represents the correct order of events in the adaptive immune response?

A. Antigen presentation, lymphocyte development, lymphocyte challenge, lymphocyte response
B. Lymphocyte development, antigen presentation, lymphocyte challenge, lymphocyte response
C. Antigen presentation, lymphocyte challenge, lymphocyte development, lymphocyte response
D. Lymphocyte challenge, antigen presentation, lymphocyte development, lymphocyte response


Answer: B

Biology & Microbiology

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Inbreeding increases the likelyhood that an individual will become homozygous for any given gene. Inbreeding may have negative consequences with regard to recessive alleles. The diagram above shows inbreeding between _________ which could lower the fitness of the homozygote. This lowering of fitness because of inbreeding is called __________.



A. siblings; inbreeding depression.
B. cousins; inbreeding depression.
C. siblings; puma concolor cory.
D. cousins; genetic drift.
E. siblings; sexual selection.

Biology & Microbiology

The secondary consumers in this food web is(are) the __________

a. spider b. beetle c. possum d. spider and possum

Biology & Microbiology

Digestion is the

A) absorption of nutrients suspended in water. B) conversion of glycogen to glucose. C) breakdown of food into molecules small enough for the body to absorb. D) churning of food in the stomach and intestine.

Biology & Microbiology

What is a 15-meter tall tree fern?

A. A gametophyte B. A sporophyte C. Haploid D. Produced by meiosis

Biology & Microbiology