Cell part responsible for maintaining cell shape, internal organization, and cel
ID: 140521 • Letter: C
Question
Cell part responsible for maintaining cell shape, internal organization, and cell movements is the
a. vesicle.
b. nucleus.
c. endoplasmic reticulum.
d. cytoskeleton.
e. ribosome.
A rod shaped bacterium is called a
a. spirillum
b. bacillus
c. coccus
d. both bacillus and coccus
The type of Archaebacteria most likley to be found in a swamp is
a. thermophilic
b. halophilic
c. cyanobacteria
d. methanogens
e. E.coli
Which of the following can bacteria use as an energy source?
a. hydrogen sulfide
b. nitrites
c. sunlight
d. ammonia
e. all of these
If the nucleus of amoeba A is removed and replaced with a nucleus from amoeba B:
a. Both amoeba A and B will die
b. Both amoeba A and B will live a long normal life
c. Amoeba A will develop the traits of amoeba B
d. Traits of amoeba A will not change
These are the primary cellular sites for the recapture of energy from carbohydrates
a. Golgi bodies
b. ribosomes
c. mitochondria
d. lysosomes
e. endoplasmic reticula
A sample of very active tissue was examined and found to contain a large number of a particular organelle. These organelles were probably:_______
a. Mitochondria
b. Ribosomes
c. Golgi bodies
d. Lysosome
Which of the following membrane proteins is responsible for binding hormones that can switch on a cell?
a. recognition proteins
b. receptor proteins
c. transport proteins
d. adhesion proteins
In certain plant cells, a secondary wall is deposited __________.
a. Inside the surface of the primary wall
b. Outside the of the primary wall
c. Both sides of the primary wall
Bacterial reproduce is through the mechanism of prokaryotic fission, which includes the steps of ____________________.
a. The bacterial chromosome is attached to the plasma membrane
b. DNA replication
c. The DNA copy is attached at the plasma membrane near the attachment site of the parent DNA
d. The two DNA molecules are moved apart by membrane growth
e.New membrane and new wall material are added transversely
f. all of above
Plasmids
a. are self-reproducing circular molecules of DNA
b. are sites for inserting genes for amplification
c. may be transferred between different species of bacteria
d. all of these
If a cell had its ribosome removed it would immediately be unable to:
a. Synthesize proteins
b. Undergo cell division
c. Excrete its waste
d. Metabolize food molecules
The smaller a cell:______
a. the greater likelihood it is prokaryotic
b. the more its mass will concentrate in the center
c. the higher its surface to volume ration
d. the greater likelihood it is an animal cell
Spherical bacteria are called
a. bacillus
b. spirillum
c. coccus
d. bacteriophages
e. all of these
What bellow cell structure is found in plant cells but NOT in animal cells?
a. nucleoplasm
b. cell wall
c. plasma membrane
d. Golgi body
e. microtubules
Mitochondria are noted for _______
a. Containing digestive enzyme
b. Producing ATP
c. Photosynthesis
d. Protein synthesis
Explanation / Answer
Answer 1. A cell is the smallest unit of life which act as the building blockof life. Cell consist of many organelles which were present inside it, and were enclosed by the membrane called plasma membrane. Organelles of a cell perform different functions such as mitochondria act as the power house of the cell, Nucleus stores genetic information and perform central dogma process, ribosomes involved in the protein synthesis, golgi bodies perform protein modification, endoplasmic performs protein folding in a proper manner, and cytoskeleton is responsible for mantaining cell shape, cell movement, and internal organizations. Hence, option (d) is correct.
Answer 2. Bacterium is a group of unicellular prokaryotic organism which is enclosed by the mebrane but lack several organelles which were present in eukaryotes. These bacteria are devoid of nucleus, due to which their genetic material is free from nuclear membrane. However, the shape of bacterium differs fromspecies to species such as baccllius have rod shape, other have curved rod shaped bacteria, coccus bacteria, spirllium, micrococci. Hence, option (b) is correct.
Answer 3. Archea are the single cell microoganism which are so different from other life forms. They survives in extreme conditions such as hgh pH, high salt, hot tempratures. Archea found in swamps, marshes areas are called as methanogens (methane produces), while thermophilic archea survives in the dot tempratures, halophilic archea found in saline conditions. Hence, option (d) is correct.
Answer 4. Bacteria are the prokaryotic unicellular organisms and having number of shapes, first life forms to be appear on earth. Bacteria inhabit in different enviornmental conditions and were were easily be grown in labortory conditions when supplemented with nutrient growth medium. Bacteria uses different forms of food when present in natural conditons such as hydrogen sulfide, nitrites, sunlight, ammonia. Therefore, all the options are correct because all these act as food material for bacterial growth and survival. Hence, option (e) is correct.
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