Which one of the following has its own DNA?
1. Mitochondria
2. Dictyosome
3. Lysosome
4. Peroxisome
The main arena of various types of activities of a cell is
1. plasma membrane
2. mitochondrion
3. cytoplasm
4. nucleus
The plasma membrane consists mainly of
1. | phospholipids embedded in a protein bilayer |
2. | proteins embedded in a phospholipid bilayer |
3. | proteins embedded in a polymer of glucose molecules |
4. | proteins embedded in a carbohydrate bilayer |
Stroma in the chloroplasts of higher plants contains
1. | light-independent reaction enzymes |
2. | light-dependent reaction enzymes |
3. | ribosomes |
4. | chlorophyll |
Middle lamella is mainly composed of
1. hemicellulose
2. muramic acid
3. calcium pectate
4. phosphoglycerides
Plasmodesmata are
1. | lignified cemented layers between cells |
2. | locomotory structures |
3. | membranes connecting the nucleus with plasmalemma |
4. | connections between adjacent cells |
Polysome is formed by
1. | several ribosomes attached to a single mRNA |
2. | many ribosomes attached to a strand of endoplasmic reticulum |
3. | a ribosome with several subunits |
4. | ribosomes attached to each other in a linear arrangement |
The two subunits of ribosome remain united at a critical ion level of
1. copper
2. manganese
3. magnesium
4. calcium
Vacuole in a plant cell:
1. | is membrane-bound and contains storage proteins and lipids
|
2. | is membrane-bound and contains water and excretory substances
|
3. | lacks membrane and contains air
|
4. | lacks membrane and contains water and excretory substances |
In germinating seeds fatty acids are degraded exclusively in the
1. proplastids
2. glyoxysomes
3. peroxisomes
4. mitochondria