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Questions in biology

[Homework Help] Which phrase best describes osmosis? A. The process where DNA is created. B. The movement of molecules through the cell membrane. C. The division process of the cell's cytoplasm. D. The movement of water molecules from an area of high concentration to an area of low concentration.

[Homework Help] Which of the following is true of a human karyotype? A. Each cell has 22 pairs of homologous chromosomes. B. Each cell has one pair of sex chromosomes. C. The chromosomes are numbered in order from 1 to 22. D. All of the above are true.

[Homework Help] In the lock-and-key model of enzyme action, the _______________ fits into _______ of the enzyme. A. product, substrate B. active site, product C. substrate, active site D. active site, substrate

[Homework Help] A woman treated her home with a pesticide that kills spiders. The first application killed 78% of the spiders. Two months later, she applied the pesticide again, but it only killed 45% of the spiders. What would best explain the decrease in the effectiveness of the pesticide?

[Homework Help] Which phrase best describes DNA? A. The structure that allows biochemical reactions to occur B. The structure that translates information into action C. The molecule that contains all the genetic material D. The molecule that breaks down sugars in the cell

[Homework Help] Multicellular plants and animals have organs to perform specific functions. What do eukaryotic cells have to perform specific functions? A. ribosomes B. organelles C. cytoplasm D. vacuole

[Homework Help] A corn plant has a genotype [tex]Sstt[/tex]. What are the possible genetic combinations that could be present in a single grain of pollen produced by the plant? A. Ss, tt, St, st B. Ss, tt, St, ST C. St, st, sT, st

[Homework Help] When an atom releases a beta particle: A. The mass number decreases by one. B. The mass number increases by one. C. The atomic number increases by one. D. The atomic number remains the same.

[Homework Help] On early Earth, what was referred to as the "primordial soup"? A. The mixture of gases in the early Earth's atmosphere. B. The combination of organic compounds in warm salty water. C. The first forms of life.

[Homework Help] Can you explain what mitochondria are? Where are mitochondria found?