Which plant cell organelle contains its own DNA and ribosome

Which plant cell organelle contains its own DNA and ribosome A) Golgi apparatus B) peroxisome C) mitochondrion Evaluate Which of the following enzymes ads a phosphate group to target portions? A) adenylyl cyclase B) phosphatase C) kinase D) glycogen phosphorylase Celery stalks that are immersed in fresh water for several hours become turgid A) the fresh water is isotonic and the salt solution is hypertonic to the cells of the celery stalks. B) the fresh water is hypertonic and the salt solution is hypertonic to the cells of the celery stalks. D) the fresh water is hypotonic and the salt solution is hypertonic to the cells of the celery stalks. E) the fresh water and the salt solution are both hypertonic to the cells of the celery stalks. The primary function of transcription factors is A) to transmit signals from an activated receptor to intra fell protons. B) to regulate gene expression. C) to regulate DNA synthesis. D) to regulate the conversion of ATP into CAMP. The secretion of a signal molecule by a cell into the local environment followed by a required by a number of cells in the immediate vicinity, is an example of A) hormonal B) paracrine signaling C) extracellular matrix signaling D) synaptic signaling The sodium potassium pump is called an pump because it A) contributes to the membrane potential B) ionizes sodium and potassium sodium and potassium atoms C) pump electrons across the plasma membrane. D) pumps hydrogen ions out of the cell.

Solution

1. the mitochondria contains its own DNA and ribosomes.

2. kinase enzyme modifies other proteins by chemically adding phosphate groups to them this is called phosphorylation. Up to 30% of all human proteins are modified by kinase activity and they are known to regulate the majority of cellular Pathways.They are also found in bacteria and plants.

3. D is the right answer. Osmosis is a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated solution. In the above case the fresh water is hypotonic so the water entered the cells and the cells became turgid. When kept in hypertonic salt solution, water moved from inside the cell to outside so they became fkaccid.

4. transcription factors are molecules involved in regulating gene expression they are usually proteins although they can also consist of short non coding RNA.They also usually found working in groups or complexes forming multiple interactions that Allow for varying degrees of control over rates of transcription.

5. paracrine signalling is a form of Cell to cell communication in which a cell produces a signal to induce changes in nearby self altering the behaviour or differentiation of those cells. The signalling molecules are released from paracrine cells and diffuse locally through the extracellular fluid targeting cells that are nearby.

6. Sodium Potassium pump is called an electronic pump because it pumps hydrogen ions out of the cell, it contributes to the membrane potential, ionizes Sodium and potassium atoms and is used to drive the transport of other molecules against a concentration gradient.