Bacterial cell wall is made of:
A. cellulose
B. Phospholipid
C. Protein
D. Murein
Answer: D. Murein
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The independent assortment of allele pairs is due to
A. the independent segregation of homologous chromosome pairs during anaphase II. B. the random combination of gametes during fertilization. C. the independent segregation of sister chromatid pairs during anaphase I. D. the independent segregation of non-sister chromatid pairs during anaphase II. E. the independent segregation of homologous chromosome pairs during anaphase I.
Prostaglandins cause a variety of effects, including
a. mucus secretion and constriction of smooth muscles in the capillaries. b. mucous secretion and constriction of smooth muscles in the bronchioles. c. histamine production and heat production. d. histamine production and dilation of smooth muscles in the bronchioles. e. heparin production and dilation of smooth muscles in the capillaries.
The radial symmetry of adult echinoderms could best be described as ________
A) biradial B) bilateral C) fourfold symmetrical D) fivefold symmetrical
Which of the following is not a reason why two children born to the same parents [not identical twins] are unlikely to have the same genetic makeup?
A) Crossing over recombines portions of sister chromatids. B) Fertilization provides a new pairing of chromosomes. C) Each sperm or egg has a random assortment of chromosomes, half from each pair. D) Chromosomes align themselves independently during meiosis I. E) Since though they are produced at different times, all sperm will be genetically different from all other sperm.