Which of the following statements concerning ribosomes are true?
A. Ribosomes have a binding site for mRNA and three binding sites for tRNA molecules.
B. No protein synthesis within a cell would occur without ribosomes.
C. Several ribosomes are often attached to and translating the same mRNA.
D. Ribosomes join amino acids to form a polypeptide.
E. All of the above statements are true.
Answer: E
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The head of a sperm is capped with an organelle that contains glycoprotein-digesting enzymes. What is this organelle called?
A. zona pellucida B. acrosome C. granulosa D. blastula E. neural cap
Four of the five answers listed below are all of the same class of vitamins. Select the exception
a. Vitamin B6 b. Vitamin B12 c. Vitamin C d. Vitamin D e. folic acid
_______ is the most common neurotransmitter released by neurons controlling skeletal muscle contraction.
Fill in the blank(s) with the appropriate word(s).
During labor, what type of feedback mechanism involves the release of oxytocin, which stimulates the uterus to contract, and these contractions stimulate the release of more oxytocin resulting in ever stronger contractions?
What will be an ideal response?