If a cell contains 84 sister chromatids at metaphase of mitosis, how many chromosomes will be present in each
nucleus in late telophase?
a. 168
b. 84
c. 42
d. 21
e. cannot be determined from the information given
ANSWER: c
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At puberty, an adolescent female body changes in both structure and function of several organ systems, primarily under the influence of changing concentrations of estrogens and other steroid hormones. How can one hormone, such as estrogen, mediate so many
effects? A) Estrogen is produced in very large concentration by nearly every tissue of the body. B) Each cell responds in the same way when steroids bind to the cell surface. C) Estrogen is kept away from the surface of any cells not able to bind it at the surface. D) Estrogen binds to specific receptors inside many kinds of cells, each with different responses. E) Cells metabolize steroids in different ways, producing by-products that stimulate tRNA production.
Which of the following foods contains the
greatest amounts of complex carbohydrates?
a. bananas b. rice c. broccoli d. apples e. beans
A prenatal diagnosis procedure that has recently come into wide use and can be performed earlier than amniocentesis
involves sampling the _____. a. yolk sac material b. allantois c. chorion d. yolk sac e. umbilical cord
The second line of defense includes inflammation, phagocytosis, fever, and antimicrobial proteins.
Answer the following statement true (T) or false (F)