1. which of the following statements are true?
a. since all cells carry out cellular respiration, they contain mitochondria
b. a cell cannot be subdivided into smaller units that maintain the living state
c. plant cells contain chloroplasts and no mitochondria while animal cells contain mitochondria and no chloroplasts.
d. the cell membrane's function to prevent diffusion of any substances into or out of the cell.
2. a biologist discovers a new unicellular organism and classifies it as a prokaryote. the cell is very small, contains a cell membrane, a cytoplasm, dna in a nucleus, and no other cell organelles. which statement below represents a correct response to the biologist’s discovery and classification?
the organism is a prokaryote, because it lacks cell organelles such as mitochondria, golgi apparatus, and endoplasmic reticulum.
the organism is a prokaryote, because it is so small and simple in structure.
the organism is a eukaryote, because it has a nucleus.
the organism is a eukaryote, because it has a cell membrane, a cytoplasm, and dna.
what would most likely happen to cells placed in fresh water?
a. water would flow out of them because they are hypotonic to the external environment
b water would flow into them because they are hypotonic to the external environment
c. water would flow out of them because they are hypertonic to external environment
d. water would flow into them because they are hypertonic to external environment
Answers: 2
Biology, 21.06.2019 23:00, gthif6088
The tasmanian devil, a marsupial carnivore, is facing extinction due to devil facial tumor disease (dftd) which causes bulging cancerous lumps and lesions to erupt around the face and neck — often causing enough deformation to make seeing or eating difficult. dftd has evolved into a contagious cancer, a trait that is unique among cancers. devil mating behavior involves biting around the head and neck, allowing cells from one individual — especially cells from the crumbly dftd tumors — to be transferred to the wounds or face of a new individual. this marsupial was once found across australia, but sea levels rose, isolating the tasmanian population, while the australian population went extinct. what would be an outcome of genetic isolation that is likely to have impacted the spread of dftd? a) reduced territory puts diseased individuals in greater contact with non-diseased ones. b) inbreeding results in less variation in facial features so the cancer is generally fatal. c) genetic isolation has made it difficult for scientists to develop a vaccine against dftd. d) the lack of genetic variation in the immune system of tasmanian devils minimizes resistance to the disease.
Answers: 3
Biology, 22.06.2019 07:20, boo8181
Agroup of plant cells was exposed to radiation, which damaged the chloroplasts and caused them to lose function. if the mitochondria were unharmed, what would happen to the overall function of the plant cells? a. the cells would not be able to make food, but would be able to release energy from biomolecules. b. the cells would not be able to replicate dna, but would be able to break down waste. c. the cells would not be able to break down waste, but would be able to replicate dna. d. the cells would not be able to release energy from biomolecules, but would be able to make food.
Answers: 1
1. which of the following statements are true?
a. since all cells carry out cellular respira...
a. since all cells carry out cellular respira...
Mathematics, 19.03.2020 02:34
French, 19.03.2020 02:34
Mathematics, 19.03.2020 02:34
Mathematics, 19.03.2020 02:34