The plant movement in the above figure is caused by
a. auxin differences in two sides of the coleoptile.
b. gibberellin released in one side of the leaf.
c. abscisic acid in two sides of the stems.
d. salicylic acid in two sides of the roots.
e. none of these.
Answer: a
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A scientist is studying some developing eggs from an ocean sample. The early embryos have divided only a few times, and all cells look identical. When the scientist carefully removes half the cells from an embryo, both clumps of cells are able to complete development, forming twins. The eggs can be identified as:
A. deuterostomes B. protostomes C. crustaceans D. cnidarians E. echinoderms Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about determinate and indeterminate development? 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?
The first human gene therapy was approved for patients suffering ADA (adenosine deaminase) deficiency. In this therapy, lymphocytes were removed from the patient, the normal ADA gene was put into the cells, and the cells were returned to the bloodstream. How was the normal ADA put into the lymphocytes?
A. Via the polymerase chain reaction. B. By fusing normal lymphocytes with deficient lymphocytes. C. Microinjection. D. Via a plasmid vector. E. Via a viral vector.
Which of these statements is true?
a. 75 percent of the causes of infertility remain unidentified. b. Long-term stress can cause early puberty and more frequent menstruation. c. Proper nutrition is an important factor in supporting fertility. d. In vitro fertilization involves injecting sperm into the uterus.
In female mammals, most genes on one of the two X chromosomes are permanently inaccessible, and
this phenomenon is called __________. Fill in the blank(s) with the appropriate word(s).