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Questions in biology

[Terjawab] Horses and zebras can be bred to produce a zorse, which is infertile. Which is most likely the reason zebras and horses are considered separate species? A. They cannot breed. B. Their offspring cannot breed. C. They look different from each other. D. They are found in different habitats.

[Terjawab] What best explains the relationship between structure and function of the cell membrane? A. The single-layer membrane surrounding the outside of the cell allows for the easy removal of waste. B. The lipids and proteins that make up the membrane allow it to be selective about what enters and leaves the cell. C. The fluid inside the membrane buffers the chemical reactions taking place inside the cell. D. The lipids forming the membrane provide energy for protein synthesis.

[Terjawab] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Terjawab] Venous blood circulation is assisted by the contraction of skeletal muscles. True False

[Terjawab] Which of the following do NOT factor into determining an individual's biological sex? A. social differences B. anatomical differences C. psychological differences D. genetic differences

[Terjawab] Which level of organization is best represented by the liver? A. tissue B. organ C. organism D. organ system

[Terjawab] What are muscles made of? A. Ligaments B. White blood cells C. Fibers D. Blood vessels

[Terjawab] What affect would a damaged thylakoid membrane have on photosynthesis? A. The damage would affect the flow of electrons through the mitochondria. B. A damaged thylakoid would affect ATP synthesis. C. The damage to the thylakoid would affect the absorption of oxygen. D. The sodium-potassium pump would be affected by a damaged thylakoid.

[Terjawab] When developing an experimental design, which action would improve the quality of the results? A. Ensure that it answers a question about cause and effect. B. Keep the sample size of test subjects to a minimum. C. Have a different researcher make the measurements. D. Include as many responding variables as possible.

[Terjawab] Which of the following best defines a gene pool? A. the sum of all genetic traits in a population's individuals at a given time B. any movement of genes from one population to another C. any movement of organisms from one environment to another D. the random change in the frequency of an allele in a population