When guard cells swell A. stomata close B. stomata open C. photosynthesis stops D. evaporation stops View Answer Workspace Report Discuss in Forum.... Water moves into roots of plants by A. osmosis B. active transport C. diffusion D. pressure flow mechanism.... The cohesion-tension theory of water movement helps to explain how water moves from soil into root? A. Through the phloem B. From leaf to root C. Through the xylem D. Into the guard cells.....

Which of the following observations is not used as evidence to support the concept of endosymbiotic origin of chloroplasts and mitochondria? A. Both have their own DNA B. Both have their own ribosomes C. Both strongly resemble prokaryotes, especially in size D. Both can live and function independently of the cell.... The fluid matrix of a cell is called the A. nucleus B. cytosol C. cytoskeleton D. endoplasmic reticulum.... In plant cells, which of the following is not a function of the large central vacuoles of plant cells? A. Storage of food B. Support C. Contractile regulation of D. Waste storage water content Which of the following can be found as a part of the mitochondrial matrix? A. Ribosomes B. DNA....

Both plant and animal cell possess A. cell walls B. mitochondria C. central vacuoles D. chloroplast The cellular organelle associated with secretion is the A. golgi complex B. mitochondrion C. ribosome D. lysosome Which of the following statements about mitochondrial proteins is true? A. All mitochondrial proteins are coded for and synthesized in the mitochondria B. Some mitochondrial proteins are coded for and synthesized in the mitochondria and others C. All mitochondrial proteins are imported from the cytoplasm D. Mitochondrial proteins arise from other mitochondrial proteins....

A cell without cell wall is called A. apoplast B. protoplast C. symplast D. none of these.... Chemical energy is supplied to eukaryotic cells by A. chloroplasts and golgi complexes B. mitochondria and ribosomes C. mitochondria only D. mitochondria and chloroplasts.... Which part of a plant contains the male sex cell? A. Ova B. Style C. Stamen D. Pollen....

Which of the following functional groups would make a carbon-based compound the least polar? A. Phosphate B. Methyl C. Carboxyl D. Amino.... Which is not true about a photon? A. It is a packet of light energy B. The shorter the wavelength, the greater the energy of the photons C. It is trapped by photosynthetic unit D. It donates electron to reduce carbon dioxide to glucose... If the ends of the following polysaccharide are pulled, which one would stretch the most? A. Glycogen B. Starch C. Cellulose D. None of these.....

The first therapeutic product formed by means of recombinant DNA technology is A. human growth hormone B. insulin C. hepatitis B vaccine D. vaccine for foot and mouth disease..... Which one of the following capsid protein of picorna virus is immunogenic in nature? A. VP1 B. VP2 C. VP3 D. VP4....... Recombinant vaccine for HBV was produced by cloning viral genes in A. plasmids B. cosmids C. autonomously replicating plasmid of yeast D. phagemids..... The promoter used for cloning HBV surface antigen is A. galactokinase B. alcohol dehydrogenase 1 C. β-galactosidase D. polyhedrin......

The piece of equipment, that introduces DNA into cells via DNA-coated microprojectiles is known as A. laser B. DNA probe C. gene gun D. inoculating needle An animal, that has gained new genetic information from the acquisition of foreign DNA, is considered as A. a chimera B. a transgenic animal C. a vector D. an enzyme that links DNA molecules The advantage of using DNA polymerases from thermophilic organisms in PCR is that A. the DNA polymerases of these bacteria are much faster than those from other organisms B. the DNA polymerases of these bacteria can withstand the high temperatures needed to denature the DNA strands......

Which of the following is not commonly used as vector? A. Artificial chromosome B. Cosmid C. Fungi D. Plasmid A short molecule containing 2-20 nucleotide is A. plasmid B. vector C. oligonucleotide D. mononucleotide....... Enzymes that recognize and cleave specific 4 to 8 base pair sequences of DNA are A. DNA ligase B. helicases C. restriction endonucleases D. DNA gyrase.... Charged molecules are separated based on varying rates of migration through a solid matrix when subjected to an electric field. This technique is known as A. photoreactivation B. gel electrophoresis C. autoradiography D. blotting........ Which of the following vector can maintain the largest fragment of foreign DNA? A. YAC B. Cosmid

A molecular technique in which DNA sequences between two oligonucleotide primers can be amplified is known as A. southern blotting B. northern blotting C. polymerase chain reaction D. DNA replication... The Southern blotting technique depends on A. similarities between the sequences of probe DNA and experimental DNA B. similarities between the sequences of probe RNA and experimental RNA C. similarities between the sequences of probe protein and experimental protein D. the molecular mass of proteins... Problems in obtaining large amounts of proteins encoded by recombinant genes can often be overcome by using A. BACS B. expression vectors C. YACS D. all of these....

Trong một nghiên cứu gần đây vào năm 2002, người ta còn tìm thấy rằng chủng tộc, của cải, học vấn mới có những vai trò chủ chốt trong việc quyết định tình trạng kinh tế trong tương lai còn IQ là một yếu tố nhỏ và sự di truyền trí thông minh còn đóng một vai trò còn nhỏ hơn thế. Nhiều người xem IQ là một biện pháp tình thế của chính phủ các nước nhằm không chấm dứt tình trạng nghèo khổ. Một số khác cho IQ là nguyên nhân của xã hội phong kiến, đối xử bất bình đẳng v̕