Which of the following is NOT an event in cell
division in animals?
a. contractile rings wrap around the cell’s
middle
b. cleavage furrow forms
c. cell pinches into
d. a cell plate partitions the cytoplasm
e. all of these ARE events in cell division in
animals
D
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Triploid organisms usually result from
A) the union of monoploid and diploid gametes. B) nondisjunction during mitosis. C) propagation of fused cell lines. D) a fertilization event that involves three monoploid gametes. E) normal fertilization of gametes produced by triploid parents.
Which soil horizon is composed of organic litter?
a. A b. B c. C d. D e. E
Which statement is true regarding bacteria?
A) All bacteria are pathogens and harmful to humans. B) Some bacteria are pathogens and harmful to humans, whereas lots of bacteria are helpful to humans. C) All bacteria are helpful to humans. D) All bacteria are pathogens, but some harm humans more than others.
You are planning to perform some protein-protein interaction studies to identify a receptor for a steroid hormone you have been working on. You start by fractionating the cell. What cell fraction would you want to work with to identify the steroid hormone receptor of interest?
A. the mitochondrial fraction B. the cytoplasmic fraction C. the extracellular fraction D. the ribosomal fraction E. the plasma membrane fraction