Fraternal twins result from
A) one egg that is fertilized by two different sperm.
B) two different zygotes.
C) one zygote that splits into two zygotes.
D) two eggs fertilized by one sperm cell.
E) a blastula that splits into two blastulas.
B
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Specialized structures within a cell that have a characteristic shape and perform specific functions in cellular growth, maintenance and reproduction are called
a) organelles. b) cytoskeletons. c) cytoplasm. d) cytosol. e) nuclei.
Which hormone disorder is associated with weight gain, sensitivity to cold, dry skin and hair, constipation, low metabolic rate, and sluggishness?
A. Acromegaly B. Addison disease C. Androgen-insensitivity syndrome D. Hyperthyroidism E. Hypothyroidism
This cartilage is 'open' in the posterior aspect:
A. corniculate B. cricoid C. thyroid D. hyoid
A base is described as a proton donor.
Answer the following statement true (T) or false (F)