Demo. An invented family, made-up minutes, nobody's real child. The quizzes work: pass a round and watch the clock change.

See it asPiperYear 10 RangiYear 7 NovaYear 3 📚 Learning by year

🧬 Biology, NCEA

Years 11 to 13 · Read up first

10 questions. Get 8 right to earn 10 minutes. All 10 right = +5 bonus. They start easy and get harder as you go, so treat the first few as a warm-up. Every one you miss comes back with the answer and why.

1. Photosynthesis mainly takes place in which organelle?

ChloroplastMitochondrionNucleusRibosome

2. Homeostasis is best described as

the maintenance of a stable internal environment despite external changesthe process of growth from birth to adulthoodthe breakdown of food in digestionthe exchange of gases in the lungs

3. Enzymes are best described as

molecules that only work outside cellsa type of carbohydrateproteins that are used up in every reactionbiological catalysts that speed up reactions without being used up

4. Homeostasis in the body typically works through

the immune system onlyrandom, uncontrolled processespositive feedback loops that amplify every changenegative feedback loops that correct changes back towards a set point

5. A species' 'niche' refers to

the role it plays and resources it uses within its habitatthe number of individuals in a populationits position in a food chain onlythe exact geographic location it lives in

6. The 'lock and key' model describes how

hormones travel in the bloodDNA is copiedenzymes are stored in the cellan enzyme's active site fits a specific substrate shape

7. DNA replication is described as 'semi-conservative' because each new DNA molecule contains

one original (old) strand and one newly made strandtwo completely new strandshalf of one gene and half of anothertwo original strands

8. A cross between two heterozygous parents (Aa x Aa) for a single gene gives what phenotype ratio in the offspring?

3 dominant : 1 recessive1 dominant : 1 recessive9:3:3:11:2:1

9. Two populations of the same species become separated by a mountain range and, over many generations, evolve into two separate species that can no longer interbreed. This is an example of

genetic drift with no isolationartificial selection by humansallopatric speciation, caused by geographic isolationsympatric speciation, occurring in the same area

10. Root hair cells absorbing mineral ions from soil, even when the soil has a lower ion concentration than the root cell, is an example of

facilitated diffusion, since no energy is neededosmosis, since it involves waterdiffusion, since ions move naturallyactive transport, since it moves ions against their concentration gradient using energy

← back