Biology Answers

what the purpose of meiosis is, how the cell reduces the chromosome number in half and the three ways that genetically different cells are made. Be sure to explain the ways and not just list them.

Why are field trips important for a plant taxonomist? What data does he/she collect during a field trip??

(ii) Some diuretics used in medicine inhibits the reabsorption of chloride ions in the Loop of Henle. Explain how this would lead to an increase in urine production.
[ 2 marks]

(i) Explain why eating large amounts of glucose can lead to an increase in urine production. [2 marks]

Draw the labelled diagram of relative concentration of auxin in different parts of seedlings.

A malnourished child presents with bruising and bleeding gums. The illness is characterised by abnormal collagen and absence of proline hydroxylation. Which vitamin is deficient in this child?
1. K 2. C 3. E 4. A

Gluconeogenesis involves the______.

1. synthesis of glycogen from glucose 2. breakdown of glycogen to form glucose 3. breakdown of glucose to produce pyruvate 4. synthesis of glucose from non-carbohydrate precursors

Which of the following conditions are not associated with abnormalities in nucleic acid metabolism?

1. Gout. 2. Parkinson’s disease. 3. Lesch-Nyhan syndrome. 4. Xanthinuria.

The bases of RNA are the same as those of DNA with the exception that RNA contains_______.
1. cysteine instead of cytosine 2. uracil instead of thymine 3. cytosine instead of guanine 4. uracil instead of adenine

. Which of the following are the interactions between substrate and active site of an enzyme?
1. Hydrogen bonding. 2. Van der Waals forces. 3. Hydrophobic interactions. 4. All of the above