All Free Biology MCQs with Answers

• A. Ethanoic acid
• B. Butanoic acid
• C. Adipic acid
• D. Phthalic acid

Explanation: Explanation for this question has been added!

• A. Mn2+
• B. Mg2+
• C. Zn2+
• D. None of these

Explanation: Mn2+, Co2+, Ni2+ with an activating effect, Zn2+ with an inhibitory effect. They all bind to the enzyme at the same site and also induce the supposed conformational change. However, Zn2+ is able to produce interactions, perhaps with Pi which is one of the products of hydrolysis, which might explain its inhibitory effect.

• A. In synthesizing pickles
• B. In paints
• C. In pesticides
• D. all of these

Explanation: Explanation for this question will be added soon!

• A. Butyric acid
• B. Phthalic acid
• C. Lactic acid
• D. Acetic acid

Explanation: Explanation for this question will be added soon!

• A. Concentration of substrate
• B. Optimum temperature
• C. Beta radiation
• D. Optimum pH

Explanation: Explanation for this question will be added soon!

• A. Four
• B. Six
• C. Five
• D. Two

Explanation: Explanation for this question will be added soon!

• A. S
• B. C
• C. N
• D. O

Explanation: Explanation for this question will be added soon!

• A. Gene therapy
• B. Radiotherapy
• C. Chemotherapy
• D. Physiotherapy

Explanation: Gene therapy is a method of treating diseases by altering the genetic material within a person's cells and often involves using bone marrow cells. Bone marrow contains stem cells that can be used in gene therapy applications to treat various genetic disorders. Radiotherapy, chemotherapy, and physiotherapy do not involve the use of bone marrow cells. Radiotherapy uses radiation, chemotherapy uses drugs, and physiotherapy focuses on physical rehabilitation techniques.

• A. UACTGUUUAGC
• B. TUCTGTTTAGC
• C. TACTGTTTAGC
• D. UACUGUUUAGC

Explanation: The sequence provided is a DNA primer, which means it is composed of DNA bases: adenine (A), thymine (T), cytosine (C), and guanine (G). DNA does not contain uracil (U), which is found in RNA. The correct complementary base pairing for the sequence ATGACAAATCG would be TACTGTTTAGC, where adenine pairs with thymine, and cytosine pairs with guanine. Therefore, the correct answer is Option C. Options A, B, and D incorrectly use uracil, which is not present in DNA.

• A. Risks of appearance of disorders in the baby
• B. Gender of the baby using the ultrasound technique
• C. Benefits of family planning for young parents
• D. Nutritional requirements of a mother and her baby

Explanation: The correct answer is Option A. The role of a genetic counsellor is to assess and communicate the risks of genetic disorders in a baby, providing vital information to parents about potential genetic conditions. Option B is incorrect because determining the baby's gender is not typically within the scope of genetic counselling; it is done through ultrasound. Option C is incorrect as family planning advice is not the primary focus of genetic counsellors. Option D is incorrect because nutritional counselling is usually the responsibility of dietitians or healthcare providers, not genetic counsellors.