Which involves adaptive cell-mediated immunity?
A. a neutrophil killing a bacteria by direct cell-to-cell contact
B. a cytotoxic T cell destroying a virus-infected cell
C. antibodies produced that destroy an invading pathogen
D. a neutrophil killing a bacteria by direct cell-to-cell contact, and a cytotoxic T cell destroying a virus-infected cell
E. a cytotoxic T cell destroying a virus-infected cell, and antibodies produced that destroy an invading pathogen
E. a cytotoxic T cell destroying a virus-infected cell, and antibodies produced that destroy an invading pathogen
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You have been assigned to analyze some extraterrestrial material recently collected from Mars. After examining a sample using a microscope you jump up excitedly and shout to your colleagues that you have confirmed the existence of life on Mars. One of your colleagues takes a look at your sample and remarks that all he sees is a single-celled "blob" with little internal structure. Assuming that life on Mars can be classified into similar domains and kingdoms as Earth, to which domain does your "blob" belong?
A. Archaea B. Fungi C. Protista D. Animalia Clarify Question 1. What is the key concept addressed by the question? 2. What type of thinking is required? 3. What key words does the question contain and what do they mean? Gather Content 1. What do you know about different domains?How does it relate to the question? Consider Possibilities 1. What other information is related to the question? Which information is most useful?If the only clue was single celled which could be correct? Choose Answer 1. Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process 1. 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?
One disadvantage of a simulation model of an ecosystem is that it
a. does not take into effect interactions between organisms. b. does not take into effect nutrient availability. c. does not take into effect water availability. d. may not be accurate. e. may predict disastrous consequences.
The term motor unit refers to
A) all the muscle fibers that synapse with one motor neuron. B) all sarcomeres within a single muscle fiber. C) an entire skeletal muscle. D) all the skeletal muscles in one region of the body. E) all the motor neurons stimulating a skeletal muscle.
Three major types of RNAs are mRNA, rRNA, and tRNA. For each of the conditions below, predict the consequences in terms of the population of proteins being synthesized in a particular cell and the effects on individual proteins
(a) An acridine dye—induced mutation (adds or deletes single bases in DNA) leads to an mRNA for one protein-producing gene. The condition is heterozygous in the involved cell. (b) A deletion (homozygous) that removes approximately half of the rRNA genes. What will be an ideal response?