Some clones of the original immune cells are
__________ cells, long-lived B and T cells reserved
for future encounters with the antigen. Fill in the blank(s) with the appropriate word(s).
Answer: memory
You might also like to view...
Research has shown that cytokinin levels fluctuate seasonally in temperate plants. What season would you expect to see the lowest levels of cytokinins and why would this be adaptive?
A. Spring, because lower levels of cytokinin allow auxin to promote rapid growth in stem height. This will allow the plant to compete effectively for sunlight. B. Summer, because lower levels of cytokinin would slow growth down and delay leaf aging. This will allow the plant to maximize the production of starch and increase it's sugar reserves. This will help ensure the plant's survival through Autumn and Winter. C. Autumn, because lower levels of cytokinin at this time of year will induce the production of ethylene. This will result in maturation of fruit and ensure effective seed dispersal before Winter. D. Winter, because lower levels of cytokinin will place buds into a dormant state. This will protect the underlying tissues from freezing until Spring. 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 already know about cytokinin levels and seasonality? 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?
Water is an example of a(n)
a. atom. b. ion. c. compound. d. mixture. e. element.
A zygote forms
a. as soon as a sperm cell penetrates an egg cell. b. when the embryo implants in the uterine wall c. when a fertilized egg divides to produce two cells. d. after at least two divisions of a fertilized egg. e. after many divisions of a fertilized egg.
Your patient has been on antibiotics for 6 weeks after a case of streptococcal endocarditis, an infection of the inner heart wall. The infection clears up. However, the patient just visited you about a urinary tract infection, and the lab verified that the culprit was E. coli. What do you hypothesize happened in this situation?
A. The antibiotics damaged her immune system, making her very susceptible to environmental bacteria. B. Her normal microbiota in the genitourinary tract were killed, allowing E. coli (not killed by the antibiotics) to establish an infection. C. The lab has made a mistake in identifying the cause, and, in fact, the endocarditis was caused by the E. coli. D. The lab has made a mistake in identifying the cause, and, in fact, the UTI was caused by the original Streptococcus.