Extranuclear inheritance is a consequence of the presence of genes in:
| 1. | Endoplasmic reticulum & mitochondria |
| 2. | Ribosomes and chloroplasts |
| 3. | Lysosomes and ribosomes |
| 4. | Mitochondria and chloroplasts |
Which one of the following hormones is a modified amino acid?
1. Progesterone
2. Prostaglandin
3. Estrogen
4. Epinephrine
Viruses that infect bacteria, multiply and cause their lysis are called:
1. Lipolytic
2. Lytic
3. Lysogenic
4. Lysozymes
The recessive genes located on X-chromosomes in humans are always:
1. Sub-lethal
2. Expressed in males
3. Expressed in females
4. Lethal
The maximum growth rate occurs in:
| 1. | Senescent phase |
| 2. | Lag phase |
| 3. | Exponential phase |
| 4. | Stationary phase |
Restriction endonucleases:
| 1. | Are used in genetic engineering for ligating two DNA molecules. |
| 2. | Are used for in vitro DNA synthesis. |
| 3. | Are synthesized by bacteria as part of their defense mechanism. |
| 4. | Are present in mammalian cells for the degradation of DNA when the cell dies. |
In the resting state of the neural membrane, diffusion due to concentration gradients, if allowed, would drive:
1. K+ and Na+ out of the cell
2. Na+ into the cell
3. Na+ out of the cell
4. K+ into the cell
Crossing over that results in genetic recombination in higher organisms occurs between:
| 1. | Non-sister chromatids of a bivalent |
| 2. | Two daughter nuclei |
| 3. | Two different bivalents |
| 4. | Sister chromatids of a bivalent |
Which of the following statements is not true for retroviruses?
| 1. | Retroviruses carry the gene for RNA-dependent DNA polymerase |
| 2. | The genetic material in mature retroviruses is RNA |
| 3. | Retroviruses are causative agents for certain kinds of cancer in man |
| 4. | DNA is not present at any stage in the life cycle of retroviruses. |
In a mutational event, when adenine is replaced by guanine, it is a case of:
1. Transcription
2. Transition
3. Transversion
4. Frameshift mutation
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