The competitive exclusion principle states that two organisms cannot fill the same niche. Please select the best answer from the choices provided T F
Which is a key element found in all carbohydrates, lipids, proteins, and nucleic acids? A. ammonia B. carbon C. nitrogen D. legumes
Sublimation is the opposite of deposition just as evaporation is the opposite of? A. Fusion B. Transpiration C. Freezing D. Condensation
About 60 percent of all known galaxies are classified as ______ A. Spiral galaxies B. Elliptical galaxies C. Irregular galaxies D. Binary systems
When a plant opens and closes its stomata, it is maintaining _____. A) sugar B) chemical transmitters C) homeostasis D) tropism
Which of the following types of carbon fixation occurs in most plants? a. C3 b. C4 c. CAM d. none of the above
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
What is the mass number of an ion with 105 electrons, 159 neutrons and a +1 charge? Express your answer as an integer.
This chart shows the types of ground tissue and their functions. mc012-1.jpgmc012-2.jpg Which row (A, B, C, or D) best matches each ground tissue with its function? A B C D
Which best describes the flow of genetic information. A= genetic information is carried only by dna. B= genetic information flows from Gene to allele to protein. C= genetic information flows from dna to rna to protein. D= genetic information cannot be transmitted outside the nucleus
In Figure 23–3, which letter points to the structure through which water is lost during transpiration? (1 point) A D E F Download jpg
The biggest threats to Christmas Island crabs during their annual migration are _______. a. dogs c. automobiles b. cats d. fences
The base sequence ACTGAC A) could occur in both DNA and RNA. B) could occur in DNA but not in RNA. C) could occur in RNA but not in DNA. D) could occur in neither DNA nor RNA.
Ethane, with the chemical formula C2H6 , is an example of _____. a kind of coal a hydrocarbon an isotope a gasoline
Which processes produce carbon dioxide as a waste product? A. the Krebs cycle and the electron transport chain B. ethyl alcohol fermentation and lactic acid fermentation C. lactic acid fermentation and the Krebs cycle D. ethyl alcohol fermentation and the Kre cycle
Which explanation is most likely the reason for the evolution of a larger brain in humans? The size of the human brain increases the more it is used. A larger brain allows humans to solve complex problems. The size of the human brain has changed randomly over time due to mutations. A large brain increases humans’ ability to fight and survive disease.
Which statement describes a step in DNA replication? The double helix unwinds and each strand forms a template for a new strand. The paired bases release many types of proteins. The DNA is cut into pieces using polymerase enzymes. New bases are built by the original strands.
During a quiet eruption, a lava flow may set fire to and then bury everything in its path. true or false
Traditional classifications tended to take into account primarily_____. a) extinct organisms b) RNA similarities c) DNA similarities d) generals similarities in appearance
The development of secondary primary sex characteristics cause girls to look like women and boys to look like men.
Which of the following accurately describes a step within transcription? A. DNA polymerase uses one strand of RNA as a template to put together nucleotides. B. The RNA strand is produced within the cytoplasm. C. The DNA strand is used as a template for which a complementary RNA strand can be produced. D. The RNA strand forms a template by which DNA can be built
Which feature do prokaryotic and eukaryotic cells share? A) nucleolus B) cytoplasm C) nuclear membrane D) membrane-bound organelles
How do passive transport and active transport differ? Is osmosis an example of passive transport or active transport? Why?
Which statement describes decomposers?. . . . A.Decomposers are those organisms that recycle matter in the ecosystem.. . . . B.Decomposers are insignificant organisms in the ecosystem and can be absent in some ecosystems.. . . C. Decomposers can produce their own source of energy and can sometimes act as primary producers. .
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.