The RNA "alphabet" used in the genetic code has ____ letters
a. 5
b. 64
c. 4
d. 20
e. 3
C
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What does the progressive hypothesis of virus evolution state?
a. Viruses originated from self-replicated entities similar to transposons. b. Viruses originated from free-living cells or intracellular parasites. c. Viruses originated from RNA and DNA molecules that escaped from a host cell. d. Viruses originated from alien DNA that was carried to Earth by a meteor.
In temperate deciduous forest, light penetration to the ground is greater during summer than during winter
Indicate whether the statement is true or false
Most protein synthesis happens on the surface of the ___________
A. rough endoplasmic reticulum D. mitochondrion B. smooth endoplasmic reticulum E. nucleus C. Golgi complex
A zygote grows by _______
Fill in the blank(s) with the appropriate word(s).