Which of these hormones can diffuse through the plasma membrane?

a. polypeptide
b. epinephrine
c. thyroxine
d. norepinephrine


c. thyroxine

Biology & Microbiology

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Premature babies that are born as early as ___ weeks after fertilization can survive

A. 22 B. 13 C. 17 D. 27 E. 30

Biology & Microbiology

The mature female gametophyte in an angiosperm ovule contains _____ cells

a. 4 b. 5 c. 6 d. 7 e. 8

Biology & Microbiology

Four of the five answers listed below are related by a common tissue type. Select the exception

a. adipose b. bone c. cartilage d. blood e. epithelium

Biology & Microbiology

Melanocytes use many enzymes to produce melanin. Based on their function, you would expect melanocytes in the skin to have a higher than usual number of

A) lysosomes. B) chloroplasts. C) ribosomes. D) microtubules.

Biology & Microbiology