How does mitosis in plant cells differ from that in animal cells? A. Plant cells lack spindle fibers. B. Plant cells lack centrosomes. *C. Animal cells lack cytokinesis. D. Animal cells lack a cell plate.
Which of the following statements about biogeochemical cycles is not true? a. Biogeochemical cycles include living and nonliving elements. b. The rock cycle is a biogeochemical cycle. c. Biogeochemical cycles are an important part of the Earth system. d. Carbon, nitrogen, and oxygen cycles are biogeochemical cycles.
Which of the following cases represents the phenomenon of contact inhibition? a. Healing of an injury b. Growth of a tumor c. Tumor metastasis
A virus is referred to as a particle rather than a cell because structurally it is a A) RNA core in a carbohydrate envelope. B) nucleus surrounded by a protein coat. C) plasmid of DNA surrounded by a capsid. D) RNA or DNA core surrounded by a protein coat.
What did Chargaff discover while studying bases in the DNA of organisms A.The bases in the DNA of each organism were unique. B.The ratios of thymine and adenine were similar, as were the ratios of guanine and cytosine. C.The overall percentages of bases were different from one organism to the next. D.There were equal amounts of all four bases in every organism, or 25 percent of each base.
A _____ is a horizontal stem that can divide and grow in several directions at once. corm rhizome stolon bulb
M. J. Schleiden shifted the scientific community's attention to cellular processes with his A. attention to disproving spontaneous generation B. publication of ideas on cell generation C. theories on the division of cells D. claim that cells were the basic unit of all plant matter
Which of the following best describes the result of meiosis II? Four genetically different, diploid daughter cells Four genetically different, haploid daughter cells Four genetically identical, diploid daughter cells Four genetically identical, haploid daughter cells I think it's C or B but I'm not sure.. please help.
Which of the following statements about tolerance range is true? a. Tolerance range is different for different organisms. b. The tolerance range is the total number of organisms that can be supported by an ecosystem. c. Tolerance range is affected by biotic factors in an ecosystem. d. The available water supply does not impact an organism’s tolerance range.
About 60 percent of all known galaxies are classified as ______ A. Spiral galaxies B. Elliptical galaxies C. Irregular galaxies D. Binary systems
Which of the following structures is most likely to be found in an autotrophic protist? a. A gullet b. A chloroplast c. A food vacuole d. A plasmodium
Traditional classifications tended to take into account primarily_____. a) extinct organisms b) RNA similarities c) DNA similarities d) generals similarities in appearance
Which feature do prokaryotic and eukaryotic cells share? A) nucleolus B) cytoplasm C) nuclear membrane D) membrane-bound organelles
Which of the following statements about the tundra is not true? a. Tundra means “treeless land.” b. Plants and animals in the tundra have adapted to the extreme climate. c. Temperatures in the tundra range from extreme highs to extreme lows. d. The alpine tundra can be found on mountaintops.
Which best illustrates the result of the process of meiosis? A pea plant has the same flower color as its parent plants. A daughter looks different from both her mother and her father. A cheetah cub has very similar fur to its mother. A Labrador puppy looks exactly like its father.
Whales have what seem like remnants of a pelvis and femur, as shown here. What are these structures an example of?
Which hormone is responsible for regulating the sleep cycle in your body? Select one of the options below as your answer: A. Melanotropin B. Melatonin C. Adrenaline
The product of the p53 gene _____. the product of the p53 gene _____. slows down the rate of dna replication by interfering with the binding of dna polymerase
Which scientist proposed a link between contaminated water and cholera A.Pasteur B. curie C. salk D.koch
Genetic drift tends to occur in populations that (1 point)are very large. are small. are formed from new species. have unchanging allele frequencies
Why do naturalists suggest that we plant more trees? Plants use CO2 but do not release any, thus maintaining a balance of CO2 in the atomsphere. Plants release CO2 through respiration and use it for photosynthesis, thus decreasing the amount of CO2 and maintaining its balance in the atmosphere. Plants do not use any CO2, thus maintaining low levels of CO2 and balancing its level in the atmosphere.
Scientific evidence is most likely to be consistent if it is based on data from A) random samples B) uncontrolled experiments C) biased experimental designs D) small data samples