What can happen when a complement protein encounters an antibody-antigen complex marking a pathogen?
A) The protein can mark the pathogen for destruction by T cells.
B) The protein can destroy the pathogen.
C) The protein can coat the pathogen to inactivate it.
D) The protein can remove the antibody for use elsewhere.
B
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Oooof! You are so full! The holiday dinner you just ate has expanded your stomach beyond its usual capacity. Which type of receptor tells you so?
a. muscle spindles b. Golgi tendon organs c. gastric stretch receptors d. Merkel’s disks
A differential cell count is used to determine each of the following EXCEPT
A) the total number of white blood cells. B) the numbers of each type of white blood cell. C) the number of red blood cells. D) leukocytosis. E) leukopenia.
At what stage of the meiotic cell cycle and during what chromosomal configuration does crossing over occur?
A) during bivalent formation, after synapsis of homologous chromosomes, and before the end of prophase I B) in S phase of meiosis C) at the four-strand stage of meiosis, after synapsis of homologous chromosomes, and before the end of prophase I D) during synapsis in prometaphase E) during synapsis at the four-strand stage of meiosis
Which one of the following statements about haplodiplontic life cycles is false?
A. The gametophyte stage produces gametes by mitosis. B. Mitosis occurs in both sporophyte and gametophyte stages. C. The zygote is the only diploid cell in the sporophyte stage. D. Spore mother cells produce haploid spores by meiosis. E. For each gene, cells of the gametophyte stage have a single allele.