Which of the following is true concerning postnatal development?
a. Infancy is defined as the first two years of life after birth.
b. Senescence results in increased hormone secretion.
c. Postnatal development occurs before birth.
d. In general, boys experience their pre-adolescent growth spurt later than girls.
e. Early childhood is a time of rapid cell division in nerve cells.
ANSWER: d
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Which two enzymes do DNA researchers need to cut and paste DNA from different sources?
a. restriction enzymes and DNA ligase b. restriction enzymes and DNA polymerase c. DNA ligase and DNA polymerase d. restriction enzymes and helicase
e. helicases and DNA polymeraseAll EXCEPT which of the following has happened
by the end of the second trimester in humans? a. The fetus weighs about five pounds. b. The mother feels the fetus moving. c. The fetus sucks and hiccups. d. Eyelids and eyelashes form. e. Soft fetal hair covers the skin.
Which statement is not true about invertebrate animals?
A. The vast majority of animal species are invertebrates. B. Many invertebrate species live in a marine environment. C. Most animal phyla are invertebrates. D. All major invertebrate groups arose from protistan ancestors. E. Invertebrates lack a nervous system.
At the end of the cell cycle there are
two identical daughter cells one cell four identical daughter cells two daughter cells, but they are not identical one half of a cell