Answer:
Endocytosis is a form of active transport hence require enegry powered by ATP. The amoeba needs to change shape and engulf and envaginate the particle and then use vessicle transportation to get the materials into the cell. This requires that the cytoskeleton - composed of tubules and filaments - contracts and relax accordingly. This requires energy by ATPs just like the myosin and actin of muscle.
Phagocytosis, another form of endocytosis, is used by some cells such as immune cells to engulf foreign material and then destroy them by use of lysozymes. This is how phagocytes protect the body from invaders.
Answer:
All of the gametes from a homozygote carry the same version of the gene while those of a heterozygote will differ.
Explanation:
A heterozygous individual carries both dominant and recessive alleles of a gene while a homozygous individual carries two copies of either dominant or recessive alleles of a gene. For example, the genotype TT and tt have two copies of dominant and recessive alleles respectively and are therefore homozygous genotypes. On the other hand, the genotype "Tt" is a heterozygous genotype.
An individual with a homozygous genotype would produce all the gametes having the same allele of the gene. The homozygous genotype "TT" would produce all the gametes with one copy of the "T" allele. An individual with a heterozygous genotype makes two types of gametes. The genotype "Tt" would produce 50% gametes having a "T" allele and rest 50% having a "t" allele. Segregation of alleles during meiosis produces different types of gametes in a heterozygous Individual.
Answer:
The circulatory system comprises of blood vessels which help in removing carbon dioxide from the body. The carbon dioxide produced by the cells is collected by the capillaries where the carbon dioxide gets dissolved in the blood. This blood is carried to the heart via the veins. The heart pumps the deoxygenated blood to the lungs where gaseous exchange occurs between the blood capillaries and the alveoli of the lungs. When we exhale, the carbon dioxide is breathed out.
Blood-vascular system and Lymphatic system
