The molecule that carries an amino acid to the ribosome for incorporation into a protein is ________
A) ATP
B) messenger RNA (mRNA)
C) ribosomal RNA (rRNA)
D) DNA
E) transfer RNA (tRNA)
E
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The molecules that stabilize the cell membrane and prevent it from breaking easily are the:
a. phospholipid molecules b. cholesterol molecules c. protein molecules d. all of the above
There are 7 tarsals in each foot, and 8 carpals in each hand, but the upper limb and the lower limb contain the same number of bones. How can this be explained?
A. The arm contains 1 bone, while the thigh contains 2 bones. B. The forearm contains 2 bones, but the leg contains only 1 bone. C. The foot contains 1 more metatarsal than the hand. D. The upper limb has no counterpart for the patella. E. The foot contains 1 more phalanx than the hand.
Which of the following is a congenital defect of the male reproductive system?
A. Androgen-insensitivity syndrome B. Erectile dysfunction C. Hypospadias D. Benign prostatic hyperplasia
Water accounts for 50% of the weight of a young adult female and 60% of a young adult male. What kind of bond is found at "B"?
A. oxygen atom B. polar covalent bond C. water molecule D. hydrogen atom E. hydrogen bond