Q. Which cell in the human body does not have the mitochondria?
erythrocytes
Q. Where is mitochondria found in sperm?
midpiece
Q. Do human sperm have flagella?
A human sperm. The motile tail of a sperm is a long flagellum, whose central axoneme emanates from a basal body situated just posterior to the nucleus. As described in Chapter 16, the axoneme consists of two central singlet microtubules surrounded by nine evenly spaced microtubule doublets.
Q. Who discovered human sperm?
Antoine van Leeuwenhoek
Q. What is the 9 2 array?
the arrangement of microtubules in a flagellum or cilium, consisting of a ring of nine evenly spaced couplets surrounding two central singlets. Symbol: 9 + 2.
Q. What is a 9 0 pattern?
The axoneme of a primary cilium typically has a ring of nine outer microtubule doublets (called a 9+0 axoneme), and the axoneme of a motile cilium has two central microtubules in addition to the nine outer doublets (called a 9+2 axoneme).
Q. What has a 9 2 arrangement?
The 9+2 arrangement is the arrangement of the microtubules which collectively forms the cylindrical structure such as the flagella and cilia.
Q. What do u mean by 9 2 arrangement?
This arrangement refers to the 9 fused pairs of microtubules on the outside of a cylinder, and the 2 unfused microtubules in the center. Dynein “arms” attached to the microtubules serve as the molecular motors.
Q. Do flagella have a 9 2 arrangement?
Both flagella and cilia have a 9 + 2 arrangement of microtubules. This arrangement refers to the 9 fused pairs of microtubules on the outside of a cylinder, and the 2 unfused microtubules in the center.
Q. Where is dynein found?
Dynein is a minus-end-directed microtubule motor protein, which transports a variety of intracellular cargo by hydrolysing ATP to power its movement along microtubule tracks. Axonemal dyneins are found cilia and flagella, whereas cytoplasmic dynein is found in all animal cells.
Q. What happens if dynein is damaged?
Disruption of dynein/dynactin inhibits axonal transport in motor neurons causing late-onset progressive degeneration. Neuron.
Q. What does dynein interact with?
Dynein is involved in the movement of chromosomes and positioning the mitotic spindles for cell division. Dynein carries organelles, vesicles and possibly microtubule fragments along the axons of neurons toward the cell body in a process called retrograde axoplasmic transport.
Q. What is dynein arm?
Axonemal dyneins form the inner and outer rows of arms associated with the doublet microtubules of motile cilia. These enzymes convert the chemical energy released from adenosine triphosphate (ATP) hydrolysis into mechanical work by causing the doublets to slide with respect to each other.
