There are ________ common amino acids used to synthesize proteins.
A. 25
B. 61
C. 64
D. 20
Answer: D
You might also like to view...
The primary difference between estrous and menstrual cycles is that _____
A) the endometrium shed by the uterus during the estrous cycle is reabsorbed with no extensive fluid flow out of the body, whereas the shed endometrium of menstrual cycles is excreted from the body B) behavioral changes during estrous cycles are much less apparent than those of menstrual cycles C) season and climate have less pronounced effects on estrous cycles than they do on menstrual cycles D) copulation normally occurs across the estrous cycle, whereas in menstrual cycles copulation only occurs during the period surrounding ovulation
Alkaloids are considered "expensive" defense compounds to produce because:
A. they contain a lot of carbon, which is costly for plants to concentrate. B. they vaporize readily, so they constantly have to be synthesized. C. they contain nitrogen, an essential and often limiting element plants need. D. they often function in very small concentrations. E. they contain proteins, which are very costly for a plant to produce.
What will happen to the pH inside a thylakoid that is exposed to light?
A. It will increase. B. It will decrease. C. It will not change.
A complex consisting of a single mRNA molecule with several ribosomes is called a ________.
A. multisome B. polysome C. maxisome D. complexisome