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In science, what is an observation?

1. AA conclusion drawn before any data are collected
2. BA rule that explains all known facts
3. CA guess about why something happens
4. DInformation gathered with the senses or instruments

How does a vaccine protect a person?

1. AIt replaces the person's white blood cells with stronger ones
2. BIt blocks the pathogen from entering the nose
3. CIt kills all bacteria in the body straight away
4. DIt trains the immune system with a harmless form of a pathogen

Which sugar is found in DNA?

1. ARibose
2. BGlucose
3. CDeoxyribose
4. DFructose

Why must human gametes be haploid?

1. ASo that the gametes can divide quickly by mitosis
2. BSo that the zygote has the normal number of 46 chromosomes
3. CSo that the gametes can make more proteins
4. DSo that the zygote has twice the normal number of chromosomes

Why does PCR use a DNA polymerase taken from bacteria that live in hot springs?

1. AIt makes the DNA strands stick together
2. BIt survives the high temperatures used to separate the strands
3. CIt copies RNA as well as DNA
4. DIt works only in the dark, like the bacteria it comes from

In a food chain, producers hold 10 000 units of energy. Roughly how much is passed on to the primary consumers?

1. AAbout 10 units
2. BAbout 10 000 units
3. CAbout 5000 units
4. DAbout 1000 units

Two parents are both AaBbCc, and the three genes assort independently. What is the probability that a child is aabbcc?

1. A1/16
2. B1/8
3. C3/64
4. D1/64

At 100× total magnification, the field of view of a microscope is 2 mm wide. What is its width at 400×?

1. A8 mm
2. B2 mm
3. C0,5 mm
4. D0,2 mm