Cellular adaptive immunity is carried out by ________.
A) B cells
B) T cells
C) bone marrow
D) neutrophils
Ans: B) T cells
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Which of the following statements describes a eukaryotic chromosome?
A) a single strand of DNA B) a series of nucleosomes wrapped around two DNA molecules C) a chromosome with different numbers of genes in different cell types of an organism D) a single linear molecule of double-stranded DNA plus proteins
Some restriction enzymes cleave DNA in such a manner as to produce blunt ends. Ligation of blunt end fragments is most often enhanced by the use of the enzyme terminal deoxynucleotidyl transferase
Speculate on the function of deoxynucleotidyl transferase in terms of using blunt end fragments in cloning.
Evolutionary fitness is measured by
a. physical strength b. reproductive success c. length of life d. resistance to disease e. competitiveness
Although the model for magnetic sensory perception is incomplete, we can hypothesize how the process of magnetic perception should work, based on other types of sensory perception. Which hypothesis for magnetic perception is consistent with how other
types of sensory perception work? A) Magnetoreceptors are triggered to open or close ion channels after detecting a change in the Earth's magnetic field. B) Changes in the flow of ion channels across the membrane of a magnetoreceptor do not affect the receptor potential. C) When an animal is no longer moving, the sensitivity of its magnetoreceptors to the Earth's magnetic field remains high. D) The order of steps in magnetic perception would be: transduction, transmission, processing, and reception.