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M1. (a) A sperm
ignore fertilise / check fertilisation / check viability
(ii) no / little chance of success over 42
the statement ‘only 2 out of 53 became pregnant / had babies’
gains 2 marks
reference to table of only 2 women became pregnant
M2. (a) 21
(b) 1/26 or 8/208 or 4/104 or 2/52
or 3.8%

(d) any
two from:
• low success rate
or not always successful
M3. (a) ovary
M4. (a) (i) any
one from:
• chemical / substance released in one part
another / target organ / tissues / cells
allow chemical from endocrine gland
(ii) in blood / circulatory system / any named part including plasma
extra wrong answer would cancel example
not red blood cells
(b)
Quality of written communication:
correct use of at least two relevant scientific term
s spelt phonetically
e.g. pregnancy, ovulation, FSH, oestrogen, progesterone, ovary, follicle, circulation, thrombosis, feminisation, sperm count, STD
any
three from:
• prevent (unwanted) pregnancy
or prevent egg release
• prolonged use may prevent later ovulation / cause infertility
e.g. circulatory problems / weight gain / nausea / headache / breast cancer / mood swings
• increased promiscuity / increase in STD’s / STI’s
e.g. feminisation of fish
or lowered sperm count in human males
• can enable woman to have children
or to become pregnant
or stimulates egg release
for full marks must score at least one re contraceptives and at
least one re fertility drugs
if unclear which type of hormone maximum 2 marks from 3
M5. (a) any
three from
if oestrogen or progesterone used = max 2
if both oestrogen and progesterone used = max 1
ignore effects of oestrogen and progesterone
(b) max
two pros for IVM / it from:
allow max two cons for IVF
• ovarian hyperstimulation
or the syndrome less likely
allow ‘it’s safer for the mother’ ignore ‘more risks’ unqualified
allow max one pro for IVF
• small risk of abnormal sex chromosomes / birth defects /
allow ‘more risk to baby’ ignore ‘more risks’ unqualified
eg IVM better because less risk to mother outweighs small risk to baby
IVF better because no risk to baby and a small risk to mother
must include an appreciation that there are two sides to the argument
M6. (a) pituitary (gland / body)
(b) oestrogen inhibits the release of FSH
FSH stimulates follicle development / causes egg to develop
or no follicle / egg development if high oestrogen
accept growth / maturing / ripening for development
do not accept no egg to be fertilised
Source: http://www.school-portal.co.uk/resource/4348420/Female+Cycle+Hormones+A.pdf
Biochemical Society Transactions (2003) Volume 31, part 2 Transgenic mouse models for studies of the role of polyamines in normal, hypertrophic and neoplastic growth A.E. Pegg*1, D.J. Feith*, L.Y.Y. Fong†, C.S. Coleman*, T.G. O’Brien‡ and L.M. Shantz* *Department of Cellular and Molecular Physiology, The Milton S. Hershey Medical Center, Pennsylvania State University College of Medicine
Material Safety Data Sheet Material Identity: DIAMABRUSH LITHIUM DENSIFIER SECTION I · PRODUCT IDENTIFICATION Manufactured For: Emergency Phone: ChemTel 1-800-255-3924 HMIS Rating Information Phone: 800-321-7044 Date Prepared: February 26, 2014 Health: 1 Fire: 0 Reactivity: 0 SECTION II · HAZARDOUS INGREDIENTS CHEMICAL NAME CAS Number SECTI