In human prenatal development, cleavage
occurs in the
a. cervix.
b. upper part of the uterus.
c. vagina.
d. oviduct.
e. ovary.
D
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Blockage of the common bile duct would be expected to affect
A. lipid digestion. B. protein digestion. C. carbohydrate digestion. D. nucleotide digestion. E. cellulose digestion.
How does a cell typically know when to divide?
A. Proto-oncogenes code for growth factor proteins that initiate cell division. B. Cells have an internal clock and divide only when they reach a certain age. C. Tumor suppressor genes code for growth factor proteins that initiate cell division. D. Oncogenes code for growth factor proteins that initiate cell division.
What adaptation is found in the evergreen trees of boreal forests?
A) a thick waxy coat on leaves B) lower levels of chlorophyll in leaves C) the ability to shed leaves when water availability is low in winter D) flower production in early spring
You see a cell with several nuclei and you know that something is different about cell division. What is the most likely explanation?
A) failure of cytokinesis following mitosis B) failure of sister chromatids to separate C) nondisjunction D) failure of homologous chromosomes to separate