Phagocytes interact speedily and effectively with pathogens because they have evolved specialized molecules called pattern recognition receptors (PRRs) that interact directly with PAMPs
Indicate whether the statement is true or false.
Answer: TRUE
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A cell biologist examines a leaf cell from an alfalfa plant during metaphase of mitosis and determines that 32 chromatids are present. The role of fertilization in this species is to (Check all that apply)
_____ Produce a new cell that has a combination of chromosomes from 2 different parents. _____ Increase the number of chromosomes per cell from 16 to 32. _____ Increase the number of chromosomes per cell from 8 to 16. _____ Combine the chromosomes from 2 haploid cells into a single diploid cell. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about fertilization? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
If a structure has no apparent function in one species, yet is homologous to a functional organ in another species, this structure is termed
A. homeotic. B. analogous. C. homologous. D. heterologous. E. vestigial.
Which of the following events occur(s) during
the follicular phase of the menstrual cycle? a. An ovarian follicle enlarges. b. A zona pellucida forms around the oocyte. c. An oocyte completes meiosis I. d. Estrogen levels increase. e. All of these occur
Which of the following is NOT strictly a freshwater community?
A. ponds B. streams C. estuaries D. lakes E. rivers