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Questions in biology

[Terjawab] Describe evidence that supports the hypothesis that whales evolved from land-dwelling mammals.

[Terjawab] Lysosomes can be compared to the recycling and garbage centers of a city. How can this comparison be justified? A. They break down their own membranes and digest themselves. B. They repair worn out organelles. C. They break down and digest whole cells.

[Terjawab] Why are nutrients from fertilizer harmful to aquatic ecosystems? A. They cause an increase in fish populations. B. The increase in algae population reduces oxygen in the water. C. They can infect plants, which causes animals and humans to become sick. D. Fish and other organisms grow too large and can no longer live in the ecosystem.

[Terjawab] Which is most likely to happen to a population that becomes anatomically isolated from the rest of its species? A. The entire species will become extinct. B. The population will become a separate species over time. C. The population will breed with a different species nearby. D. The entire species will continue to have viable offspring together.

[Terjawab] Water molecules can pass into a cell, while larger molecules cannot. Which feature of a cell allows this to be true? A. Semipermeable membrane B. Photosynthetic chloroplasts C. Enzyme-carrying lysosomes

[Terjawab] Why do the cells in all living things need energy? A. to fuel their chemical reactions B. to help them decompose C. to communicate with other cells D. so they can block sunlight

[Terjawab] What stone-faced animal was all the rage in 1970?

[Terjawab] 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.

[Terjawab] 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.

[Terjawab] 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