Which of the following is an undesirable
characteristic of the cuticle?
a. It restricts the movement of water.
b. It is transparent to sunlight.
c. It coats the exposed surface of leaf epidermal
cells.
d. It restricts the movement of carbon dioxide.
e. None of these is undesirable.
Answer: d
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The reason to use lacZ in the creation of a fusion gene for studying gene expression is:
A. the lacZ gene product binds to the activator domain increasing gene expression. B. the lacZ gene product is easily measured. C. the lacZ gene product interferes with the DNA binding domains of repressor proteins. D. the lacZ gene product will form a leucine zipper with the other domain of the fusion gene product.
Proteins that are destined to become associated with the inner surface of the plasma membrane are:a
manufactured in the same way as protein hormones. b. manufactured in the same way as proteins destined to become external peripheral proteins. c. made on free ribosomes in the cytoplasm. d. made on ribosomes located on the rough endoplasmic reticulum. e. transported to the plasma membrane within a secretory vesicle
When does the segregation of alleles occur?
A) Homologous chromosomes separate during meiosis. B) Homologous chromosomes separate during mitosis. C) Sister chromatids separate during meiosis. D) Sister chromatids separate during mitosis.
Paramecium lives in freshwater; a(n) __________ rids them of excess water.
Fill in the blank(s) with the appropriate word(s).