Which are accurate statements about the life cycle of protozoa?
Parasites can live in harsh environments as cysts
. The cyst form of a protozoa allows the organism to live for long periods of time in harsh environments. Trophozoites are the actively infective form of amoeba.
Which are accurate statements about peptidoglycan?
Which are accurate statements about peptidoglycan?
Peptidoglycan provides the structure of the bacterial cell wall
.,The peptidoglycan layer is thicker in Gram-positive bacteria. The peptidoglycan layer in Gram-positive organisms is located external to the cell membrane.
Which of the following are used by protozoa for motility?
Which of the following are used by protozoa for motility?
Cytoplasmic extensions called pseudopods, flagella, cilia
.
Are protozoa bacteria?
Protozoa (pronounced: pro-toe-ZO-uh) are one-celled organisms, like bacteria
. But they are bigger than bacteria and contain a nucleus and other cell structures, making them more similar to plant and animal cells.
What characteristic do protozoa display?
Protozoa are mostly single-celled, motile protists that feed by phagocytosis. They commonly show the characteristics usually linked with animals, such as
mobility and heterotrophy
. Most protozoa are too small to be seen with the naked eye and are best seen under a microscope.
What is unique about protozoa?
Protozoa are notable for their
ability to move independently
, a characteristic found in the majority of species. They usually lack the capability for photosynthesis, although the genus Euglena is renowned for motility as well as photosynthesis (and is therefore considered both an alga and a protozoan).
Which are accurate statements regarding the life cycle of Plasmodium falciparum?
Which are accurate statements regarding the life cycle of Plasmodium falciparum?
Merozoites infect red blood cells. The merozoites enter the red blood cells, duplicate, and rupture the cells. Merozoites become gametocytes.
Which of the following statements about gram-positive bacteria is true?
The correct statement is that
gram positive bacteria contains only of peptidoglycan
.
Which statement most accurately describes bacterial cells?
Which statement most accurately describes bacterial cells?
Bacterial cells have DNA, but they do not have a nucleus
. What structure is found in animal, plant, and bacterial cells? What is a similarity among animal, plant, and bacterial cells?
What do protozoa need to survive?
Most protozoa are heterotrophic and survive by consuming
bacteria, yeast, fungi, and algae
. There is evidence that they may also be involved, to some extent, in the decomposition of soil organic matter.
How are protozoa transmitted?
Transmission of protozoa that live in a human’s intestine to another human typically occurs
through a fecal-oral route
(for example, contaminated food or water or person-to-person contact).
How do protozoa adapt to harsh environmental conditions?
Many protozoans respond to adverse environmental conditions
by encysting
: they secrete a thick, tough wall around themselves and effectively enter a quiescent state comparable to hibernation.
Are protozoa heterotrophic or autotrophic?
protozoan, organism, usually single-celled and
heterotrophic
(using organic carbon as a source of energy), belonging to any of the major lineages of protists and, like most protists, typically microscopic. All protozoans are eukaryotes and therefore possess a “true,” or membrane-bound, nucleus.
In what ways do protozoa differ from bacteria?
Protozoa (pro-toe-ZO-uh) are one-celled organisms, like bacteria. But they are
bigger than bacteria and contain a nucleus and other cell structures
, making them more like plant and animal cells. Protozoa love moisture.
What are the five characteristics of protozoa?
- They are commonly called flagellates.
- Locomotory organelles are flagella in adults.
- The body is covered by a pellicle.
- Binary fission is longitudinal.
- They are mostly free-living though some are parasitic.
- Nutrition is autotrophic or heterotrophic or both.
What characteristic do all protozoa display quizlet?
What are the characteristics of Protozoa? They are
unicellular, chemoheterotrophs (get energy from breaking down organic matter), have special structures for ingesting food and are capable of reproduction
.
What are three defining characteristics of protozoa?
What are three defining characteristics of protozoa? They are
eukaryotic, single-celled, and lack cell walls
. You just studied 35 terms!
What characteristic do all protozoa display Brainly?
Protozoa are notable for their
ability to move independently
, a characteristic found in the majority of species. They usually lack the capability for photosynthesis, although the genus Euglena is renowned for motility as well as photosynthesis (and is therefore considered both an alga and a protozoan).
What are two characteristics of protozoa?
- They have flagella for locomotion.
- Their body is covered by a cuticle or pellicle.
- Freshwater forms have a contractile vacuole.
- Reproduction is by binary fission (longitudinal division)
- Examples: Trypanosoma, Trichomonas, Giardia, Leishmania, etc.
What are the four groups of protozoa and how are they distinguished?
Historically protozoa were divided into four major groups:
the ameba, the flagellates, the ciliates, and the sporozoa
. The distinguishing features between the groups was based on motility (i.e., ameboid, flagella, cilia).
What is the economic importance of protozoa?
These Protozoa play an important role in the
sanitary betterment, improvement of water and keeping water safe for drinking purposes
. Planktonic Protozoa as food: Protozoa floating on the plankton of sea provide directly or indirectly the source of food supplies to man, fish and other animals.
Is Plasmodium falciparum Gram positive or negative?
Bacterial isolates were classified as
Gram-negative
(including Salmonellae) or Gram-positive. Malaria was defined as fever with the presence of asexual malaria parasites on the blood film, classified as P. falciparum, P. vivax, Plasmodium malariae or Plasmodium ovale.
Is Plasmodium a protozoa?
The causative agent of malaria is a protozoan parasite
, species Plasmodium.
What is the life cycle of Plasmodium?
Plasmodium life cycle – UpToDate. (1) Plasmodium-infected Anopheles mosquito bites a human and transmits sporozoites into the bloodstream. (2) Sporozoites migrate through the blood to the liver where they invade hepatocytes and divide to form multinucleated schizonts (pre-erythrocytic stage).
Which statements are true about the differences between Gram positive and Gram-negative bacteria?
Which states are true about the differences between Gram-positive and Gram-negative bacteria?
Gram-positive have a thick layer of peptidoglycan, while Gram-negative have a thin layer of peptidoglycan surrounded by the outer membrane.
Which of the following statements are true for Gram-negative bacteria?
Which of the following are true for Gram-negative bacteria? Explanation: Experimental evidence suggests that during staining of Gram-negative bacteria
the alcohol treatment extracts the lipid, which results in increased permeability of the cell wall
.
Which of the following statements is correct about passive diffusion?
Which of the following statements is correct about passive diffusion?
It involves movement of molecules down a concentration gradient and may require a transport protein.
