Metastasis is the process by which _________
Answer: B
Metastasis is the spread of cancer cells through the blood or lymph to distant parts of the body.
Cells break away from the primary tumour, travel, lodge and start secondary growths. It is what makes cancer lethal: most deaths are from the secondaries rather than the original tumour.
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Which organelles in the cell, other than nucleus contains DNA?
Answer: D
Apart from the nucleus, mitochondria contain DNA.
Each carries a small circular chromosome and its own ribosomes, and is inherited only from the mother. Chloroplasts do the same in plants. The centriole, Golgi apparatus and lysosomes contain none.
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Which is the Largest Organ in the Human Body?
Answer: C
The skin is the largest organ of the human body - about 1.7 square metres and a sixth of body weight.
It keeps water in and micro-organisms out, regulates temperature, and carries the receptors for touch, pressure, pain and temperature.
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Nutrients are needed by organisms in order to
Answer: A
Organisms need nutrients to build tissue and release energy.
Carbohydrates and fats supply energy, proteins supply the material for growth and repair, and vitamins and minerals let the reactions proceed. Every organism needs both a source of energy and a source of building material.
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In photosynthesis________
Answer: A
In photosynthesis light energy is converted into chemical energy, stored in the bonds of glucose.
\[ \mathrm{6CO_2 + 6H_2O \xrightarrow{light} C_6H_{12}O_6 + 6O_2} \]
It is the entry point for almost all the energy in the living world; respiration then releases it again.
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Which of these does not contain a structural protein?
Answer: B
Ovalbumin is not a structural protein - it is the storage protein of egg white.
Tendons and ligaments are made of collagen and elastin, and muscle of actin and myosin, all of which are structural. Ovalbumin's role is to store amino acids for the developing chick.
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At what temperature do pathogenic bacteria grow best in food?
Answer: C
Pathogenic bacteria grow fastest between about 20 and 45°C.
This is the danger zone for food, and it brackets body temperature, 37°C, which is where human pathogens are best adapted to grow. Refrigeration below 5°C slows them and cooking above 70°C kills them.
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Which feature do Prokaryotic and Eukaryotic cells share
Answer: B
Prokaryotic and eukaryotic cells both contain DNA.
They also share ribosomes, a plasma membrane and cytoplasm. What the prokaryote lacks is a nuclear membrane and every membrane-bound organelle, so its DNA lies free in the cytoplasm as a single circular chromosome.
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What do genes code for?
Answer: A
Genes code for proteins.
The DNA sequence is transcribed into messenger RNA and translated at the ribosome into a chain of amino acids, three bases specifying each amino acid. Some genes code instead for functional RNAs, but the classical gene specifies a protein.
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What carries Blood back to the Heart?
Answer: A
Veins carry blood back to the heart.
The pressure in them is low, so they have thin walls and rely on the squeezing of surrounding muscles to move the blood, with one-way valves to stop it flowing back. Arteries carry blood away from the heart at high pressure.
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