If pigments from a particular species of plant are extracted and subjected to paper chromatography, which of the following is most likely?
A) Paper chromatography for the plant would isolate a single band of pigment that is characteristic of that particular plant.
B) Paper chromatography would separate the pigments from a particular plant into several bands.
C) The isolated pigments would be some shade of green.
D) Paper chromatography would isolate only the pigments that reflect green light.
B
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The first cell of a new individual is the
a. blastula. b. gastrula. c. embryo. d. zygote. e. gamete
An individual with an uncertain vaccine history has been brought to the emergency room after receiving severe lacerations in an accident with farm machinery
In addition to administering a tetanus toxoid vaccine, he is given a shot of tetanus immune globulin (TIG), a form of passive immunization. Why are both necessary? A) The tetanus vaccine provides immediate protection, and the tetanus immune globulin provides long-term protection. B) The doctor is not sure which will work faster in this patient so decides to administer both. C) The tetanus immune globulin is given only when there are severe injuries and a high risk of infection. D) Tetanus immune globulin is always given along with the tetanus vaccine. E) The tetanus immune globulin provides immediate, short-term protection, and the tetanus vaccine provides long-term protection.
What occurs after cytokinesis is completed?
A.) The cell organizes its microtubules B.) The cell begins to replicate its DNA C.) The cell enters G1 D.) The cell enters G2
Hypothalamic hormones that stimulate the production of anterior pituitary hormones are called
A) secondary messengers. B) releasing hormones. C) thyroid-stimulating hormones (TSHs). D) inhibiting hormones. E) ACTH.