9. A porous test (shell) of calcium carbonate, through which paeudopodia protrud
ID: 277860 • Letter: 9
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9. A porous test (shell) of calcium carbonate, through which paeudopodia protrude, is cheactertio diatoms B) foraminiferans C) ciliatesD) water molds 50. A large senweed that floats freely on the surface of doep bodies of water wouild be especled to hawe A) rigid stems 1B) bladders C) true rootsD) gel-forming proteins 51 which ef the following D) include species that cause malaria A) possess two flagella B) are all autctrophic C) lack mitochondria 52. When a mosquito infected with Piamodium firnt bietes a human, the Plasmodiu B) cells infect the human liver cells D) oocyst undergoes meiosis C) cells cause lsing of the human red blood cells A) gametes fuse, forming an ooeyst 53. Trypancsome infections evade attacks by bost immume sy stenss through which of the following A) production of new cell-surface proteins with a different molecular structure by each new B) production of toxins that kill lymphocytes C) insertion of its DNA into the noclear DNA of host cells D) infection of lymphocytes leading to a decline in the host's ability to fight infection A) unicellula B) eukayotic C) symbionts D) mixotrophis 55. The chloroplasts of land plants are thought to have been derived according to which evolutionnry seqaence? A) cyanobacteria green algae- land plants B) cyanobacteria-eron algae-, fungi ? land plants C) red algae ? brown algae ? green algae ? land plants D) cyanobacteria ? red algae-poen alga-land plants parasite of humans and other mammals that causes intestinal ailments in most people who es anaerobically metabolize glucose froes the host's intestinal contents to produce ATP 56. Giandia intestinalis is an intestinal ingest the cy sts. Upon a ventral adhesive disk. The trophozoit Reproduction is completely asexual, haploid nuclei ( resistant to cold, bcat, and dehydration Infection usually occurs by drinking untreated water that contains The cysts of Giardia function most like the ingestion, each cyst relcases two motile cells, called trophozoites. These attach to the small intestine's lising via c ccurring by longitudinal binary fission of tropbozoites, with each daughter oell receiving two n 5) A trophozoite will often encyst as it passes into the large intestine by secreting around itself a case that is drinking untreated water that contains cysts A) mitochondria of ancestral diplomonads B) maclei of archacans C) endospores of bacteria 57, Many parasitic members of the excavates lack plastids and have highly reduced mitochondria. Which of the following statements D) capsids of viruses These parasites live indark, low-osygen conditions,and therdfore it ws adsptive to mowe all plasid and mitochondrial gemes to B) The original, eukaryotic ancestors of these parasites did not engulf prokaryotes C The parasies iveidar lowtonshrefosids und mitochondria did not resalt in lower D) In the future, natural selection will favor descendants that acquire new plastid genes from today's prokaryotes explains these observations? A) These parasitcs live in dark, genes to the nucleus fitnessExplanation / Answer
Ans 49) (b) Foraminifera – It is member of class of amoeboid protists that is characterized by streaming granular ectoplasm. It is single celled organism with shells or tests that is found in all sorts of marine environment.
Ans 50) (c ) True Roots – The root like structure anchors the seaweeds strongly to the substrate. It is also known as holdfasts as it varies in shape.
Ans 51) (a) possess two flagella – It contains two flagella where one may be contained in groove like structure around the cingulum enabling forward motion and the other is the longituidinal that provides little propulsive force.
Ans 52) When a mosquito infected with Plasmodium first bites a human, the plasmodium (b) cells infect the human liver cells. This leads to spread of the infection throughout the body.
Ans 53) (a) production of new cell surface proteins with different molecular structure by each new generation. This leads to rapid spread of the infection during the infection that is being initiated by trypanosome.
Ans 54) (b) Eukaryotes – it is because all of the protists have a well defined nucleus. It also has all the organelles that are membrane bound.
Ans 55) (a) Cyanobacteria – Green algae – Land plants
The chloroplasts of the land plants have developed starting from the cyanobacteria which are blue-green algae. This is followed by its presence in green algae and finally to land plants.
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