There are 306 bones in the human body. babies start out with 300 bones, when they grow up these bones grow together to make one large bone. by the time your an adult you'll have exactly 206 bones. half of these bones can be found in your hands and feet!
1. the turning of all or part of an organism in a particular direction in response to an external stimulus.
2. Phototropism is a response to the stimulus of light, whereas geotropism (also called gravitropism) is a response to the stimulus of gravity . ... when the stem grows against the force of gravity, this is known as a negative geotropism.
3. Terrestrial plants direct their root systems downwards into the soil, mainly in response to the gravity vector; however, as the roots search for water and nutrients, they frequently change direction to avoid obstacles (thigmotropism). Root hydrotropism is a mechanism found in many species to avoid water stress.
Answer:
c. Tubulin
Explanation:
Tubulin protein is polymerized to form the cylindrical structures of microtubules. Microtubules form the spindle apparatus during cell division. The spindle microtubules become attached to the kinetochores of chromosomes and mediate the alignment of chromosomes at the equator of cells during metaphase. The shortening of spindle microtubules is responsible for the movement of sister chromatids during anaphase. The same event also moves the homologous chromosomes during anaphase-I.
Any failure in the formation of the spindle apparatus would not allow the proper separation of chromosomes. Therefore, the cell with abnormal chromosome separation might have a faulty or no tubulin.
I'm pretty sure it would be D... If that's wrong I'm sorry.
