Biology, 16.10.2019 02:40 katiebotts18
Aheart cell was taken from a rat and placed in flask a, which contained a nutrient-rich culture medium. a kidney cell was taken from the same rat and placed in flask b, which contained the same nutrient-rich culture medium. twenty-four hours later both flasks were dense with cells, indicating cellular division had occurred. the flasks were analyzed to determine what types of cells were present. which of the following best explains why all the cells in flask a were heart cells and all the cells in flask b were kidney cells? information dictating cell type is passed from a parent cell to offspring during mitosis.
no crossing-over or mutations occurred during cell division.
the parent cell secreted enzymatic signals that stimulated the offspring to develop into the same cell type.
the parent cells must have been homozygous for genes encoding cell type
Answers: 2
Biology, 21.06.2019 15:00
Disinfection of impression materials is usually accomplished by a. sterilization with high heat. b. spray or immersion in a chemical disinfectant. c. sterilization with steam under pressure. d. allowing the impression to sit 24 hours in water until all the organisms die.
Answers: 2
Biology, 22.06.2019 16:00
Where is having brightly colored feathers that attract mates most clearly an adaptation for a bird? a. a forest with dense vegetation b. a sandy beach beside an ocean c. a snowy tundra with little vegetation d. a swamp with many hawks that eat birds
Answers: 1
Biology, 22.06.2019 17:00
Imagine a person stepping on a pin and pulling his or her foot away. look at the reflex arc of this scenario below. which statement best describes the image? a)the sensory nerve carries the signal from the effector to the interneuron, and the motor neuron carries the signal to the receptor. b)the motor nerve carries the signal from the receptor to the interneuron, and the sensory neuron carries the signal to the effector. c)the sensory nerve carries the signal from the receptor to the interneuron, and the motor neuron carries the signal to the effector. d)the sensory nerve carries the signal from the receptor to the motor neuron, and the interneuron carries the signal to the effector.
Answers: 1
Aheart cell was taken from a rat and placed in flask a, which contained a nutrient-rich culture medi...
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