IB DP Biology: HL复习笔记7.1.1 DNA Structure
Nucleosomes Unlike most prokaryotic DNA which is referred to as ‘naked’, eukaryotic nuclear DNA is associated with proteins called histones (to form chromatin) Histones package the DNA into structu...
IB DP Biology: HL复习笔记6.6.6 Skills: Reproduction Diagrams
Male & Female Diagrams You should be able to annotate diagrams of the female and male reproductive systems to show the names of the different structures You should also be able to recall the fu...
IB DP Biology: HL复习笔记6.6.5 Reproduction: Sex Determination in Females
Oestrogen & Progesterone During early development an embryo develops embryonic gonads that will either become ovaries in females or testes in males The factor that determines whether the embryo...
IB DP Biology: HL复习笔记6.6.4 Reproduction: Sex Determination in Males
SRY Gene In sexual reproduction in humans, a sperm from a male fuses with, or fertilises, an egg from a female to form a zygote, which then develops into an embryo To begin with the embryo develops...
IB DP Biology: HL复习笔记6.6.3 Reproduction: Background
William Harvey & Sexual Reproduction in Deer William Harvey (1578 - 1657) was an English physician who contributed greatly to our understanding of anatomy and physiology He is mainly remembered...
IB DP Biology: HL复习笔记6.6.2 Hormones Continued
Leptin Leptin is a hormone that is secreted by fat storage cells known as adipose cells The concentration of leptin in the blood is controlled by the amount of adipose tissue in the body As we eat ...
IB DP Biology: HL复习笔记6.6.1 Hormones
Insulin & Glucagon The pancreas is an organ found in the abdomen of mammals It functions as both an endocrine gland and an exocrine gland Endocrine glands secrete hormones directly into the blo...
IB DP Biology: HL复习笔记6.5.4 Skill: Neurones & Synapses
Analysis of Oscilloscope Traces It is possible to measure membrane potentials in neurones by placing electrodes on each side of the membrane A membrane potential is the difference in charge between...
IB DP Biology: HL复习笔记6.5.3 Synapses
Synapses Where two neurones meet, they do not actually come into physical contact with each other Instead, a very small gap, known as the synaptic cleft, separates them The ends of the two neurones...
