A
Before meiosis begins, during S phase of the cell cycle, the DNA of each chromosome is replicated so that it consists of two identical sister chromatids, which remain held together through sister chromatid cohesion. This S-phase can be referred to as "premeiotic S-phase" or "meiotic S-phase".
Answer:
e) Invertebrates lack a nervous system
Explanation:
One of the main characteristics of invertebrates is that they don't have a backbone. Backbones belong to the skeletal system. A totally different story is the nervous system which runs inside the backbone. Although the more complex nervous systems appear in vertebrates the simply fact of having eyes like crabs or insects implies having a nervous system that can control them.
Answer:
a. hemoglobin now binds more oxygen at low partial pressures than at high partial pressures.
Explanation:
I took regular Biology in 9th Grade, AP Chemistry in 10th Grade, AP Biology in 11th Grade, and DE (Dual Enrollment) Microbiology in 12th Grade. Currently majoring in Biology at the University of Michigan - Ann Arbor.
