A change in the nucleotide sequence of a gene effects function of that gene in c
ID: 165548 • Letter: A
Question
A change in the nucleotide sequence of a gene effects function of that gene in cells that express that gene. but is limited to a single cell type. after gene duplication events. resulting in paedomorphosis. The first terrestrial organisms probably were considered which of the following? Burrowers Photosynthetic Multicellular Prokaryotes eukaryotes plants and their associated fungi 2 and 4 3 and 5 1, 3, and 5 2, 3, and 6 Which of the following is a biological cause of extinctions? habitat destruction change in environment temperature ocean anoxia origin of new species Which of the following is an accurate characteristic of bacterial cell walls? They are primarily made of chitin. They prevent cells from bursting in hypertonic environments They prevent cells from bursting in hypotonic conditions. They only have peptidoglycan if they are gram-negative. The predatory bacterium Bdellovibrio bacteriovorus drills into a prey bacterium and, once inside, digests it. In an attack upon a gram-negative bacterium that has a slimy cell covering, what is the coned sequence of structures penetrated by B. bacteriovorus on its way to the prey's cytoplasm? membrane composed mostly of lipopolysaccharide membrane composed mostly of phospholipids Peptidoglycan capsule 2, 4, 3, 1 1, 3, 4, 2 1, 4, 3, 2 4, 1, 3, 2 4, 3, 1, 2 Which of the following is least associated with the others? horizontal gene transfer genetic recombination conjugation transformation binary fission According to the endosymbiotic theory of the origin of eukaryotic cells, how did mitochondria originate? from infoldings of the plasma membrane, coupled with mutations of genes for proteins in energy - transfer reactions engulfed, originally free-living proteobacteria from secondary endosymbiosis.Explanation / Answer
Answer (17) (A) in cells that express those genes.
Answer (18) first terrestrial organisms on land were prokaryotic, photosynthetic organisms through which primitive plants evolved. thus, the answer is A (2,4)
Answer (19) biological cause of extinction is change in environment temperature (B)
Answer (20) bacterial cell walls are made up of peptidoglycan and NAG & NAM units, it prevents from hypotonic bursting. (C)
Answer (21)( D) 4,1,3,2. The gram negative bacteria contains an outer slimy capsule, inner to that an LPS (lipopolysaccharide) containing outer membrane, and peptidoglycan and innermost phospholipid containing membrane which cover the cytoplasm.
Answer (22) (E) binary fission is a reproduction process in which clones are produced which are identical to their parents(asexual reprouction) whereas, in other given process, genetic material exchange takes place and new daughter cells are produced with different genetic makeup (sexual reproduction)
Answer (23) mitochondria are originated from bacteria that are engulfed by some other bacteria(B)
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