Which of the following statements about endosymbiosis is FALSE?
a. endosymbiosis has taken place many times among true, multicellular animals
b. genes from organelles that originated through endosymbiosis are largely transferred to the
host cell nucleus
c. The genes that code for ribosomes in mitochondria and chloroplasts are more like those in
prokaryotes than in eukaryotes
d. mitochondria and chloroplasts divide on their own through binary fission
e. endoysymbiosis occurred many times in unicellular animals
E
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Mutated versions of one or both of the genes BRCA1 and BRCA2 are associated with an increased risk of ________
a. breast cancer only b. lung cancer and pancreatic cancer c. both breast cancer and ovarian cancer d. lymphoma only
If the cell was a cube and you doubled the height, width, and length of the cell, how much would the surface area increase?
Cells come in a range of sizes, and a variety of shapes. Assuming a cell type has a conservative cube shape, it may have limits to size, because of the need of materials to diffuse into or out of the cell through the surface area of the cell membrane. Calculate the numerical changes of a cube-shaped cell from an original size of 10 ?m × 10 ?m × 10 ?m. A. 8-fold B. It would stay the same. C. 4-fold D. 2-fold E. 6-fold
The plant hormone that promotes dormancy in some
plants and seeds is a. abscisic acid. b. auxin. c. gibberellin. d. ethylene. e. none of these.
Which of the following is an example of mutualism?
a) a clown fish lives inside a sea anemone and is protected by it, while the anemone receives nothing from the clown fish b) a jaguar kills and consumes a gazelle c) a remora fish removes algae and parasites from a shark's skin and receives protection in return d) a wasp paralyzes a caterpillar and lays its egg inside it e) a female cuckoo lays its egg in the nest of a smaller bird, which then raises the cuckoo chick