True, only plant cells have vaculoes.
The digestive system is made up hollow organs that consists of the mouth, esophagus, stomach, small intestine, large intestine and anus, sequentially. The supplementary organs are the liver, pancreas and the gall bladder.
The food enters first through the (1) MOUTH where mastication or the mechanical breakdown of food particles takes place. After the food is being swallowed it passes through the (2) ESOPHAGUS which is the conduit between the pharynx and (3) STOMACH which secretes acid and enzymes that chemically breaks down food that is termed as chyme. It comprises 10% of the digestion and absorption. The chyme or partially digested food goes to the (4) SMALL INTESTINE where 90% of the digestion and absorption takes place. Its main functions is to absorb the nutrients and minerals from the chyme. (5) The LARGE INTESTINE is where the water from the remaining indigestible food matter is being absorbed. It also transmits the useless waste material from the body where it is excreted through the (6) ANUS
Answer:
The prime function of the GTPase activity of the G-alpha protein is to perform the hydrolysis of the attached guanosine triphosphate or GTP. Upon combination with the GTP, the G-alpha protein becomes activated, and when hydrolysis of GTP takes place to guanosine diphosphate or GDP, the G-alpha subunit becomes inactivated.
Therefore, the activity of the GTPase provides the G protein-coupled signaling mechanism's regulation. In case, if the mutation takes place within the gene encrypting the G-alpha subunit, then the inhibition of GTPase activity occurs, which would eventually result in the following outcomes:
1. The stimulation of the signaling pathway may take place for a prolonged time duration, eventually causing an unwanted differentiation of the cell.
2. There would be a spontaneous enhancement in the concentration of cyclic-AMP within the cell.
3. The activation of the G-alpha subunit would take place for a prolonged time duration.
Answer:
22. False
23. True
24. False
25. True
26. b. Louis Pasteur
27. c. germ
28. b. chromatids
29. a. microscope
30. c. cell membrane
Explanation:
22. Robert Hooke was an English scientist, but he did publish his microscopic observations
23. Anthrax is an infectious disease caused by rod-shaped bacteria known as Bacillus anthracis. It is quite common in livestock and can be passed to humans
24. Vaccinations are a direct application of the study of microbes. Microbes are directly used in the production of viruses - a small amonut of the microbes or its proteins can invoke an immune response that the body will remember the next time it is exposed to the pathogen.
25. Telocentric chromosomes have their centromere located at one end of the chromosome. The ends of the chromosome are called telomeres.
26. Louis Pasteur disproved the theory of spontaneous generation with his famous swan-neck flask experiment. He found that microorganisms could not grow in sterile conditions. He then proposed that “life only comes from life.”
27. The germ theory is the idea that pathogens (microorganisms) can cause disease. Before that, the working theory was than diseases spontaneously generated.
28. When chromosomes are duplicated during DNA replication before mitosis, the two identical chromosomes are called sister chromatids
29. A microscope is a tool that allows researchers to see very small structures
30. The cell membrane is composed of a lipid bilayer that surrounds the cell and controls the entry and exist of substances.
Climate variability and change affects birdlife and animals in a number of ways; birds lay eggs earlier in the year than usual, plants bloom earlier and mammals are come out of hibernation sooner. Distribution of animals is also affected; with many species moving closer to the poles as a response to the rise in global temperatures. Birds are migrating and arriving at their nesting grounds earlier, and the nesting grounds that they are moving to are not as far away as they used to be and in some countries the birds don’t even leave anymore, as the climate is suitable all year round.
