A person has the blood group AB, what determines this blood group? a) different alleles on different chromosomes b) different alleles on the same chromosomes c) the same alleles on different chromosomes d) the same allele on the same chromosomes I thought that the answer shoul...
A variety of snail has an inherited condition that affects the thickness of the shell. The alleles are t and n. tt have thick shells tn have thin shells nn do not survive Two heterozygous snails are mated. What is the probability that a surviving snail of the next generation i...
What is the percentage of oxygen in expired air when a person is resting?
Which is the most direct way that the carbon in starch stored in cereal grain can be released to the atmosphere as carbon dioxide? 1. grain destroyed by fire 2. grain eaten by birds 3. grain made into bread and eaten by humans 4. grain stored in damp conditions goes mouldy and...
Which blood vessel contains blood that has high oxygen concentration, low carbon dioxide concentration, and high pressure? 1. aorta 2. pulmonary artery 3. pulmonary vein 4. vena cava I wrote the answer as 3, but is wrong. Which one is the correct answer?
Which method of birth control prevents the implantation of the fertilised egg? 1. coil (mechanical) 2. condom (mechanical) 3. spermicide (chemical) 4. vasectomy (surgical) I don't get the question. The correct answer was number 1, but shouldn't all the options be corre...
sorry! There's a mistake. the four choices are: 1. nucleus 2. cell wall 3. chloroplast 4. vacuole So which one is the correct option?
If i do a starch test on a plant cell that comes from a plant exposed to sunlight, which parts of the plant cell will be stained blueblack? 1. nucleus 2. cell wall 3. cytoplasm 4. vacuole I wrote the answer as 4, the vacuole, but the correct answer says 3, the cytoplasm. Shoul...
Inorganic fertiliser is applied each year to fields bordering a lake. the fertiliser runs off into the lake and causes six changes which altogether make the fish die. 1. aerobic bacteria feed on dead plants 2. algae reproduce faster 3. light cannot penetrate water 4. oxygen le...