IB DP Biology: HL復習筆記7.1.3 Non-coding DNA
Non-coding Regions of DNA DNA molecules are very long but?only certain regions code?for the production of polypeptides These are called?coding sequences In humans only?1.5% of the genome?contains c...
IB DP Biology: HL復習筆記7.1.2 Mechanism of DNA Replication
Leading Strand & Lagging Strand Double-stranded DNA consists of?two antiparallel strands?(oriented in opposite directions) During DNA replication, the two strands are ‘unzipped’ and DNA polymer...
IB DP Biology: HL復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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...
