Genetic testing by ____ can be performed earliest in pregnancy
a. amniocentesis
b. obstetric sonography
c. fetoscopy
d. chorionic villus sampling
e. preimplantation genetic diagnosis
ANSWER: d
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The basis of cellular differentiation is
a. the operon b. selective gene expression. c. cloning. d. mutation.
Answer the following statements true (T) or false (F)
1. Plant behavior is defined as response to stimuli. 2. Plant hormones (growth regulators) can travel from cell to cell within the plant only if they are moved by electrical impulses. 3. Plants grow towards light because they sense a need for light. 4. The production of roots on cuttings of a houseplant is promoted when auxins are applied to the cut ends.
Explain the need for a null hypothesis, especially in ecology and evolution. What does a null hypothesis accomplish?
What will be an ideal response?
The primary portal of entry for fungal infections is
A. the nervous system. B. the digestive system. C. the respiratory tract. D. the urinary tract. E. through skin.