The RNA "alphabet" used in the genetic code has ____ letters

a. 5
b. 64
c. 4
d. 20
e. 3


C

Biology & Microbiology

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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.

Biology & Microbiology

In temperate deciduous forest, light penetration to the ground is greater during summer than during winter

Indicate whether the statement is true or false

Biology & Microbiology

Most protein synthesis happens on the surface of the ___________

A. rough endoplasmic reticulum D. mitochondrion B. smooth endoplasmic reticulum E. nucleus C. Golgi complex

Biology & Microbiology

A zygote grows by _______

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology