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OAT Biology Practice 40 Questions And Correct Answers Latest Update
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OAT Biology Practice 40 Questions And CorrectAnswers Latest Update
Q1: Bryophyta (mosses) - ANS Avascular plants that alternate between haploid and
diploid forms and have flagellated sperm.
Pterophyta (ferns) - ANS Vascular plants that alternate between haploid and diploid
forms and have flagellated sperm
Rhizopoda (amoebas) - ANS Avascular plants that do not alternate between haploid and
diploid forms.
Coniferophyta (pines) - ANS Avascular plants that do not have flagellated sperm.
Angiosperms (flowering plants) - ANSWER Avascular plants which alternate between
haploid and diploid forms, but do not have flagellated sperm
Q2: Nucleolus - ANSWER Cellular organelle that is directly responsible for ribosome
synthesis
Endoplasmic Reticulum - ANSWER Rough ER functions in protein synthesis and Smooth
ER functions in lipid synthesis and detoxification of chemicals.
Mitochondria - ANSWER Site of aerobic respiration.
Golgi Apparatus - ANSWER Modifies new proteins and packages them for distribution
Lysosomes - ANSWER Function in the intracellular digestion of proteins,
, polysaccharides, fats, and nucleic acids, as well as obsolete organelles.
Q3: Human Chorionic Gonadotropin (hCG) - ANSWER This is a hormone secreted by the
embryo that functions in maintaining the corpus luteum.
Estrogen - ANSWER This is a substance produced by the ovary in females that initiates
and maintains female sex characteristics and functions in the development of the
uterine lining in preparation for pregnancy.
Progesterone - ANSWER Works with estrogen to thicken the uterine lining in
preparation for a fertilized egg.
Androgens- ANSWER Secreted by testis in males works to develop and maintain male
sex characteristics, as well as promote spermatogenesis.
Insulin- ANSWER Secreted by the pancreas has the effect of reducing blood glucose
levels.
Q4: Active Transport - ANSWER Molecules are transferred across the cell membrane
against their concentration gradient assisted by membrane proteins. Because they are
going against the concentration gradient, ENERGY IS REQUIRED.
Facilitated Diffusion - ANSWER Molecules are transferred across the cell membrane
along their concentration gradient assisted by membrane proteins. Because they are
going with the gradient, NO ENERGY IS REQUIRED.
Q5: Which of the following is NOT a form of asexual reproduction: External Fertilization -
ANSWER A form of sexual reproduction, because it involves the fusion of female and
male gametes.
Binary Fission - ANSWER Form of asexual reproduction where each daughter cell gets a
single copy of the parent's chromosome.
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