Which are the male gametophytes in flowering plants?
a. sperm
b. anthers
c. pollen grains
d. stamens
Ans: c. pollen grains
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Which traits were originally used for classifying organisms into taxonomic categories?
a. morphology and behavior b. DNA and amino acid sequences c. physiology and biochemical pathways d. geography and ecology e. morphology and physiology
Glucagon raises blood glucose levels by:
a. stimulating the liver to take up glucose. b. inhibiting gluconeogenesis. c. stimulating gluconeogenesis. d. inhibiting fatty acid mobilization. e. inhibiting amino acid mobilization
A solution of (GMS/KOH/DIF) is used to dissolve keratin and cellular material in skin scrapings, leaving only the fungal cells for examination
What will be an ideal response?
Which of the following statements is TRUE?
A) Individuals with familial Down syndrome are trisomic and have 47 chromosomes. B) Familial Down syndrome is caused by a translocation involving chromosome 21. C) Translocations may be pericentric or paracentric. D) In general, inversion and translocation heterozygotes are as fertile as organisms whose chromosomes are in the standard arrangement. E) Inversions and translocations are without evolutionary significance.