Question

1. Which of the following waves of an EKG is correct?

1. P wave-depolarization of atria
2. QRS wave-repolarization of ventricles
3. T wave-depolarization of ventricles
4. QRS wave-depolarization of atria

2. Which of following is correctly matched?

1. Tricuspid valve- permits blood flow from right to left atrium
2. Pulmonary valve- permits blood flow from left ventricle to aorta
3. Mitral valve- permits blood flow from left atrium to left ventricle
4. Aortic valve- permits blood flow from right ventricle to pulmonary artery

3.Cyclic AMP is a common second messenger, which are associated with what type of hormones?

1. Peptide
2. Steroid
3. Both A & B
4. Fatty acids

4. If two white sheep, where white gene is dominant, produces an offspring that is a black sheep, the white sheep is:

1. Homozygous dominant
2. Heterozygous dominant
3. Heterozygous recessive
4. Homozygous recessive

5. In a sex-linked hemophilia disease due to a recessive gene, a mating of heterozygous female non-hemophilia  with non-hemophilia male  will result in:

1. 100% females with hemophilia
2. 100% males will not be hemophilia
3. 50% males will be hemophilia
4. None of offspring will be hemophilia

Answer 1

ANSWER :

1. The P wave on the EKG (electrocardiogram) represents the depolarization of both the atria (or atrial systole). Hence option (a) is the correct answer choice.

2. The mitral or bicuspid valve situated at the junction of left atrium and left ventricle, which functions to permit the flow of oxygenated blood from the left atrium to the left ventricle. Hence option (c) is the correct answer.

3. The cyclic AMP (cyclic adenosine monophosphate) is the common secondary messenger in the cytosolic signal transduction pathway for peptide or amine hormones. Hence option (a) is the correct answer.

4. The white colour of sheep is a dominant trait (W), if two heterozygous white coloured sheep with genotype (Ww) mate then they would produce one offspring with black colour (bb), which is due to homozygous recessive genotype. Hence option (b) is the correct answer.